CN116614146A - Device, method and chip for detecting and suppressing power line communication narrowband interference - Google Patents

Abstract

The embodiment of the disclosure discloses a device, a method and a chip for detecting and suppressing narrowband interference of power line communication, and relates to the technical field of power line communication. The device comprises: the narrow-band detection and suppression unit acquires OFDM signals and synchronous state information; when the current state of the channel is determined to be an idle state based on the synchronous state information, detecting an OFDM signal in a parallel mode to obtain and send a first detection result to a main control unit; responding to the working mode switched to the serial mode, carrying out narrow-band interference suppression and detecting the suppressed OFDM signal to obtain and send a second detection result to the main control unit; the main control unit receives the first detection result and the second detection result; switching the narrowband detection and suppression unit working mode into a series mode when the narrowband interference is determined to exist based on the first detection result; and determining whether the narrowband interference disappears based on the second detection result. Accurate detection and suppression of narrowband interference is achieved through a simple device with low performance requirements.

Description

Power line communication narrowband interference detection and suppression device, method and chip

technical field

The present disclosure relates to the technical field of power line communication, in particular to a power line communication narrowband interference detection and suppression device, method and chip.

Background technique

Power line communication (power line communication, PLC) refers to a communication method that uses power lines to transmit data and media signals. application. The power line is mainly designed for the transmission of electric energy. When it is used as a communication channel, severe narrowband interference generally exists in the low-voltage power line channel. If the narrowband interference is strong and has many frequency points, it will seriously affect the power line communication performance, so it is necessary to suppress the narrowband interference in the power line channel.

At present, when detecting and suppressing narrowband interference in power line channels, time-frequency transformation is usually performed on the received signal or channel frequency domain response is used, and then in the frequency domain, it is judged whether the There is narrowband interference. If there is narrow-band interference, perform clipping and zeroing operations at the corresponding narrow-band interference point in the frequency domain, or configure a corresponding notch filter in the time domain. However, when the above-mentioned method utilizes time-frequency conversion to perform narrowband detection and interference, if it is realized by hardware devices, the required hardware device scale is large and complicated; CPU) has high performance requirements. When using the frequency domain response of the channel to detect and suppress narrowband interference, due to the strong frequency selectivity of the power line channel, it is difficult to select the judgment threshold of the time-frequency domain narrowband when receiving signals, and there is a certain probability of detection error.

Therefore, how to accurately detect and suppress narrowband interference with a simple device with low performance requirements has become an urgent technical problem to be solved.

Contents of the invention

In order to solve problems in related technologies, embodiments of the present disclosure provide a power line communication narrowband interference detection and suppression device, method and chip.

In a first aspect, an embodiment of the present disclosure provides a device for detecting and suppressing narrowband interference in power line communication.

Specifically, the narrowband interference detection and suppression device for power line communication includes: a narrowband detection and suppression unit and a main control unit;

The narrowband detection and suppression unit is used to obtain an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) signal and synchronization state information; when the current state of the channel is determined to be an idle state based on the synchronization state information, in parallel mode Next, detect the OFDM signal to obtain a first detection result; send the first detection result to the main control unit; and perform narrowband interference suppression in the series mode in response to the working mode being switched to the series mode , and detecting the suppressed OFDM signal to obtain a second detection result; sending the second detection result to the main control unit;

The main control unit is configured to receive the first detection result; determine whether there is narrowband interference based on the first detection result; and switch the working mode of the narrowband detection and suppression unit to series mode; and receiving the second detection result; determining whether the suppressed narrowband interference disappears based on the second detection result.

In an implementation manner of the present disclosure, the main control unit is further configured to configure multiple detection parameter groups for the narrowband detection and suppression unit based on the working frequency band of the narrowband detection and suppression unit, and the detection parameter groups It includes a narrowband central frequency point, a notch bandwidth, and a power calculation length; wherein, the multiple narrowband central frequency points are different from each other, and the multiple narrowband central frequency points cover the working frequency band.

In an implementation manner of the present disclosure, the narrowband detection and suppression unit includes at least one narrowband component, and the narrowband component includes a wave trap and a power calculation unit;

In the parallel connection mode, the first end of the wave notch filter in the narrowband component is connected to the input end of the narrowband detection and suppression unit, and the second end of the wave notch filter is connected to the input end of the narrowband component. The second end of the power calculation unit is connected, and the first end of the power calculation unit is connected to the first end of the wave trap;

In the series mode, the first end of the wave notch filter in the narrowband component is respectively connected to the first input end and the first end of the power calculation unit in the narrowband component, and the notch The second terminal of the device is respectively connected with the second output terminal and the second terminal of the power calculation unit.

In an implementation manner of the present disclosure, when the narrowband detection and suppression unit includes a narrowband component, the first input terminal is the input terminal of the narrowband detection and suppression unit, and the second output terminal is the The output terminal of the narrowband detection and suppression unit.

In an implementation manner of the present disclosure, when the narrowband detection and suppression unit includes a plurality of narrowband components and the narrowband component is located at the head end of the plurality of narrowband components, the first input end is the narrowband detection and the input end of the suppression unit, the second output end is the first end of the first notch filter in the first narrowband component, or the second output end is the output end of the narrowband detection and suppression unit; wherein, The first narrow belt component is located behind the narrow belt component, and there is no other narrow belt component between the first narrow belt component and the narrow belt component.

In an implementation manner of the present disclosure, when the narrowband detection and suppression unit includes a plurality of narrowband components and the narrowband component is located in the middle of the plurality of narrowband components, the first input end is in the second narrowband component The second end of the second notch filter, or the first input end is the input end of the narrowband detection and suppression unit; the second output end is the first end of the first notch filter in the first narrowband component , or the second output terminal is the output terminal of the narrowband detection and suppression unit; wherein, the second narrowband component is located before the narrowband component, the first narrowband component is located after the narrowband component, and the There are no other narrow belt components between the first narrow belt component and the narrow belt component and between the second narrow belt component and the narrow belt component.

In an implementation manner of the present disclosure, when the narrowband detection and suppression unit includes a plurality of narrowband components and the narrowband component is located at the end of the plurality of narrowband components, the first input end is in the second narrowband component The second end of the second notch filter, or the first input end is the input end of the narrowband detection and suppression unit; the second output end is the output end of the narrowband detection and suppression unit; wherein, the The second narrow belt component is located before the narrow belt component, and there is no other narrow belt component between the second narrow belt component and the narrow belt component.

In an implementation manner of the present disclosure, the narrowband assembly is used for

acquiring at least one detection parameter set in a parallel mode;

Determine the corresponding first signal power when the received OFDM signal is input to the first end of the wave notch filter in the narrowband component and the corresponding first signal power when the OFDM signal is output to the second end of the wave notch filter based on the detection parameter group Two signal power;

generating the first detection result based on the first signal power and the second signal power;

Sending at least one of the first detection results to the main control unit.

In an implementation manner of the present disclosure, the main control unit is configured to

receiving a plurality of said first detection results from at least one of said narrowband components;

determining a plurality of interference signal-to-noise ratios (signalto interference plus noise ratio, SINR) based on a preset first formula according to the plurality of first detection results;

determining a preset number of target interference signal-to-noise ratios from the plurality of interference signal-to-noise ratios;

determining that narrowband interference exists in response to the target interference signal-to-noise ratio being less than a preset interference signal-to-noise ratio threshold; or,

In response to the target interference signal-to-noise ratio being greater than or equal to the interference signal-to-noise ratio threshold, determine a preset number of standard deviations corresponding to the target interference signal-to-noise ratio;

In response to the standard deviation being greater than a preset interference signal-to-noise ratio standard deviation threshold, it is determined that narrowband interference exists.

In an implementation manner of the present disclosure, the main control unit is configured to

In response to the existence of narrowband interference, determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio whose value is less than the interference signal-to-noise ratio threshold, or determine the minimum of two values from the preset number of the target interference signal-to-noise ratio The target interference signal-to-noise ratio, and determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio with the smallest value;

Determine a target narrowband component from the at least one narrowband component based on the number of target narrowband center frequency points, the number of the target narrowband component is less than or equal to the number of target narrowband center frequency points, and the target narrowband component at the front end of the at least one narrowband assembly;

Switch the working mode of the target narrowband component to a serial mode.

In an implementation manner of the present disclosure, the target narrowband component is used to

Determine the corresponding first target signal power when the OFDM signal received at the target narrowband central frequency point is input to the first end of the target notch filter in the target narrowband component in the series mode and the OFDM signal is output to the target The corresponding second target signal power at the second end of the notch filter;

generating a second detection result based on the first target signal power and the second target signal power;

Sending the second detection result to the main control unit.

In an implementation manner of the present disclosure, the main control unit is configured to

receiving the second detection result of the target narrowband component;

determining a target interference signal-to-noise ratio based on the second detection result and the first formula;

In response to the target interference signal-to-noise ratio being greater than the sum of the interference signal-to-noise ratio threshold and a preset interference signal-to-noise ratio margin, determine that the narrowband interference at the target narrowband center frequency point disappears.

In an implementation manner of the present disclosure, the main control unit is also used to

In response to the narrowband interference disappearing, switch the working mode of the target narrowband component that sends the second detection result to a parallel mode.

In an implementation of the present disclosure, the device further includes:

a sending unit, configured to generate and send an OFDM signal based on the original data.

In an implementation of the present disclosure, the device further includes:

An analog front-end unit, located behind the sending unit, is used to perform signal amplification, filtering and analog-to-digital conversion processing on the received OFDM signal.

In an implementation of the present disclosure, the device further includes:

An automatic gain control unit, located behind the analog front-end unit, is used to adjust the gain of the analog front-end unit, so that the amplitude of the OFDM signal input to the automatic gain control unit falls within a preset demodulation range.

In an implementation of the present disclosure, the device further includes:

A digital band-pass filter, located after the automatic gain control unit, is used to determine the corresponding first power when the received OFDM signal is input to the digital band-pass filter and the corresponding second power when the OFDM signal is output to the digital band-pass filter. power;

In response to the difference between the first power and the second power being greater than or equal to a preset power difference threshold, a first mode switching instruction is sent to the automatic gain control unit, and the first mode switching instruction is used to instruct switching the working mode to the slow mode .

In an implementation manner of the present disclosure, the narrowband detection and suppression unit is further configured to send a first mode switching instruction to the automatic gain control unit in response to the working mode being switched to the series mode, and the first mode The switch command is used to indicate to switch the working mode to the slow mode;

In response to the working mode not being switched to the series mode, a second mode switching instruction is sent to the automatic gain control unit, and the second mode switching instruction is used to instruct switching the working mode to the normal mode.

In an implementation of the present disclosure, the device further includes:

A synchronization unit, located after the narrowband detection and suppression unit, is configured to determine the current synchronization state of the synchronization unit based on the analysis of the received OFDM signal; send the narrowband detection and suppression unit based on the current synchronization state Synchronization status information described above.

In an implementation manner of the present disclosure, the synchronization unit is further configured to send a third mode switching instruction to the automatic gain control unit in response to the synchronization state being the initial frame synchronization state, and the third mode switching The instruction is used to instruct to switch the working mode to the stop mode.

In an implementation of the present disclosure, the device further includes:

The demodulation and decoding unit, located after the synchronization unit, is used to demodulate and decode the received OFDM signal, so as to determine the original data carried in the OFDM signal.

In a second aspect, embodiments of the present disclosure provide a method for detecting and suppressing narrowband interference in power line communication.

Specifically, the method is applied to a narrowband detection and suppression unit including at least one narrowband component, and the method includes:

Obtain OFDM signal and synchronization status information;

When it is determined that the current state of the channel is an idle state based on the synchronization state information, the OFDM signal is detected in parallel mode to obtain a first detection result;

sending the first detection result to the main control unit;

In response to switching the working mode of the narrowband detection and suppression unit to a series mode, narrowband interference suppression is performed in the series mode, and the suppressed OFDM signal is detected to obtain a second detection result;

Sending the second detection result to the main control unit.

In an implementation manner of the present disclosure, the detection of the OFDM signal in parallel mode to obtain a first detection result includes:

Acquire multiple detection parameter groups in parallel mode;

Determine the corresponding first signal power when the received OFDM signal is input to the first end of the wave notch filter in the narrowband component and the corresponding first signal power when the OFDM signal is output to the second end of the wave notch filter based on the detection parameter group Two signal power;

generating the first detection result based on the first signal power and the second signal power;

The sending the first detection result to the main control unit includes:

Sending multiple first detection results to the main control unit.

In an implementation manner of the present disclosure, the detection of the suppressed OFDM signal to obtain a second detection result includes:

determining the corresponding first target signal power when the OFDM signal received at the target narrowband center frequency is input to the first end of the target notch filter of the target narrowband component in the at least one narrowband component and the OFDM signal outputting the target notch The second terminal of the oscilloscope is the corresponding second target signal power, the target narrowband component is the narrowband component whose working mode is switched to series mode in the at least one narrowband component, and the target narrowband center frequency point is the main The control unit determines the narrowband central frequency point where narrowband interference exists based on the first detection result;

The second detection result is generated based on the first target signal power and the second target signal power.

In a third aspect, embodiments of the present disclosure provide a method for detecting and suppressing narrowband interference in power line communication.

Specifically, the method is applied to the main control unit, and the method includes:

receiving a first detection result from the narrowband detection and suppression unit, and determining whether there is narrowband interference based on the first detection result;

In response to the presence of narrowband interference, switching the working mode of the narrowband detection and suppression unit to a series mode;

receiving a second detection result from the narrowband detection and suppression unit, and determining whether the suppressed narrowband interference disappears based on the second detection result;

In response to the disappearance of the narrowband interference, the working mode of the narrowband detection and suppression unit is switched to a parallel mode.

In an implementation manner of the present disclosure, the receiving the first detection result from the narrowband detection and suppression unit, and determining whether there is narrowband interference based on the first detection result includes:

receiving a plurality of first detection results from at least one narrowband component in the narrowband detection and suppression unit;

Determining multiple interference signal-to-noise ratios based on a preset first formula according to multiple first detection results;

determining a preset number of target interference signal-to-noise ratios from the plurality of interference signal-to-noise ratios;

determining that narrowband interference exists in response to the target interference signal-to-noise ratio being less than a preset interference signal-to-noise ratio threshold; or,

In response to the target interference signal-to-noise ratio being greater than or equal to the interference signal-to-noise ratio threshold, determine a preset number of standard deviations corresponding to the target interference signal-to-noise ratio;

In response to the standard deviation being greater than a preset interference signal-to-noise ratio standard deviation threshold, it is determined that narrowband interference exists.

In an implementation manner of the present disclosure, the switching the working mode of the narrowband detection and suppression unit to the series mode in response to the presence of narrowband interference includes:

In response to the presence of narrowband interference, determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio whose value is less than the interference signal-to-noise ratio threshold, or determine the two minimum values from the preset number of the target interference signal-to-noise ratio Target interference signal-to-noise ratio, and determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio with the smallest value;

Determine a target narrowband component from the at least one narrowband component based on the number of target narrowband center frequency points, the number of the target narrowband component is less than or equal to the number of target narrowband center frequency points, and the target narrowband component at the front end of the at least one narrowband assembly;

Switching the working mode of the target narrowband component in the narrowband detection and suppression unit to a series mode.

In an implementation manner of the present disclosure, the receiving the second detection result from the narrowband detection and suppression unit, and determining whether the suppressed narrowband interference disappears based on the second detection result includes:

receiving a second detection result from the target narrowband component in the narrowband detection and suppression unit;

determining a target interference signal-to-noise ratio based on the second detection result and the first formula;

In response to the target interference signal-to-noise ratio being greater than the sum of the interference signal-to-noise ratio threshold and a preset interference signal-to-noise ratio margin, determine that the narrowband interference at the target narrowband center frequency point disappears.

In an implementation manner of the present disclosure, the switching the working mode of the narrowband detection and suppression unit to a parallel mode in response to the disappearance of the narrowband interference includes:

In response to the narrowband interference disappearing, switch the working mode of the target narrowband component sending the second detection result to a parallel mode.

In an implementation of the present disclosure, the method further includes:

Configure multiple detection parameter groups for the narrowband detection and suppression unit based on the operating frequency band of the narrowband detection and suppression unit, the detection parameter groups include narrowband center frequency points, notch bandwidths, and power calculation lengths; The narrowband central frequency points are different from each other, and multiple narrowband central frequency points cover the working frequency band.

In a fourth aspect, an embodiment of the present disclosure provides a chip, including: at least one processor, configured to implement any implementation manner of the second aspect and the second aspect, or any one of the third aspect and the third aspect The functions involved in the implementation.

The technical effects provided by the embodiments of the present disclosure may include the following beneficial effects:

The above technical solution provides a power line communication narrowband interference detection and suppression device, the device includes a narrowband detection and suppression unit and a main control unit, the narrowband detection and suppression unit can obtain OFDM signals and synchronization state information, and determine based on the synchronization state information When the current state of the outgoing channel is the idle state, the OFDM signal is detected in parallel mode to obtain a first detection result, and the first detection result is sent to the main control unit. The main control unit can receive the first detection result, and determine whether there is narrow-band interference based on the first detection result, and switch the working mode of the narrow-band detection and suppression unit to the series mode if there is narrow-band interference. When the narrowband detection and suppression unit determines that the working mode is switched to the series mode, it indicates that there is narrowband interference, then it performs narrowband interference suppression in the series mode, and continues to detect the suppressed OFDM signal to obtain the second detection result, and Send the second detection result to the main control unit. The main control unit may receive the second detection result, so as to determine whether the suppressed narrowband interference disappears based on the second detection result. Since the present disclosure uses the same set of hardware devices for narrowband detection and suppression, the implementation of the hardware device is relatively simple, and the present disclosure detects narrowband interference when the channel is idle, and utilizes the characteristics of slow passage of narrowband interference in the power line channel to avoid power line interference. Detection error caused by channel frequency selectivity. In addition, since the main control unit only makes basic judgments on narrowband interference, the performance requirements for the main control unit are relatively low. Therefore, accurate detection and suppression of narrowband interference is realized with a simple device with low performance requirements.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

Other features, objects and advantages of the present disclosure will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the attached picture:

Fig. 1 shows a structural block diagram of a narrowband interference detection and suppression device for power line communication according to an embodiment of the present disclosure.

Fig. 2 shows a structural diagram of a narrowband component in a parallel mode according to an embodiment of the present disclosure.

FIG. 3 shows a structural diagram of a narrowband component in series mode according to an embodiment of the present disclosure.

Fig. 4 shows another structural block diagram of a narrowband interference detection and suppression device for power line communication according to an embodiment of the present disclosure.

Fig. 5 shows a flow chart of a method for detecting and suppressing narrowband interference in power line communication according to an embodiment of the present disclosure.

Fig. 6 shows another flow chart of a method for detecting and suppressing narrowband interference in power line communication according to an embodiment of the present disclosure.

Detailed ways

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily realize them. Also, for clarity, parts not related to describing the exemplary embodiments are omitted in the drawings.

In the present disclosure, it should be understood that terms such as "comprising" or "having" are intended to indicate the presence of features, numbers, steps, acts, components, parts or combinations thereof disclosed in the specification, and are not intended to exclude one or a plurality of other features, numbers, steps, acts, parts, parts or combinations thereof exist or are added.

In addition, it should be noted that, in the case of no conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings and embodiments.

As mentioned above, at present, when detecting and suppressing narrowband interference in power line channels, time-frequency conversion is usually performed on the received signal or the frequency domain response of the channel is used, and then in the frequency domain according to the average power of each frequency point and Peak power, to determine whether there is narrow-band interference. If there is narrow-band interference, perform clipping and zeroing operations at the corresponding narrow-band interference point in the frequency domain, or configure a corresponding notch filter in the time domain. However, when the above method uses time-frequency transformation to perform narrowband detection and interference, if it is implemented by hardware devices, the required hardware device scale is large and complex, and if it is implemented by software, it requires high CPU performance. When using the frequency domain response of the channel to detect and suppress narrowband interference, due to the strong frequency selectivity of the power line channel, it is difficult to select the judgment threshold of the time-frequency domain narrowband when receiving signals, and there is a certain probability of detection error. Therefore, how to accurately detect and suppress narrowband interference with a simple device with low performance requirements has become an urgent technical problem to be solved.

In view of the above defects, the present disclosure provides a power line communication narrowband interference detection and suppression device, the device includes a narrowband detection and suppression unit and a main control unit, the narrowband detection and suppression unit can obtain OFDM signals and synchronization state information, based on When the synchronization state information determines that the current state of the channel is an idle state, the OFDM signal is detected in parallel mode to obtain a first detection result, and the first detection result is sent to the main control unit. The main control unit can receive the first detection result, and determine whether there is narrow-band interference based on the first detection result, and switch the working mode of the narrow-band detection and suppression unit to the series mode if there is narrow-band interference. When the narrowband detection and suppression unit determines that the working mode is switched to the series mode, it indicates that there is narrowband interference, then it performs narrowband interference suppression in the series mode, and continues to detect the suppressed OFDM signal to obtain the second detection result, and Send the second detection result to the main control unit. The main control unit may receive the second detection result, so as to determine whether the suppressed narrowband interference disappears based on the second detection result. Since the present disclosure uses the same set of hardware devices for narrowband detection and suppression, the implementation of the hardware device is relatively simple, and the present disclosure detects narrowband interference when the channel is idle, and utilizes the characteristics of slow passage of narrowband interference in the power line channel to avoid power line interference. Detection error caused by channel frequency selectivity. In addition, since the main control unit only makes basic judgments on narrowband interference, the performance requirements for the main control unit are relatively low. Therefore, accurate detection and suppression of narrowband interference is realized with a simple device with low performance requirements.

Details of the embodiments of the present disclosure will be described in detail below through specific embodiments.

Fig. 1 shows a structural block diagram of a narrowband interference detection and suppression device for power line communication according to an embodiment of the present disclosure.

As shown in Figure 1, the device includes: a narrowband detection and suppression unit and a main control unit.

Among them, the narrowband detection and suppression unit is used to obtain OFDM signals and synchronization state information; when the current state of the channel is determined to be idle based on the synchronization state information, the OFDM signal is detected in parallel mode to obtain the first detection result; The control unit sends the first detection result; and in response to the working mode being switched to the serial mode, narrowband interference suppression is performed in the serial mode, and the suppressed OFDM signal is detected to obtain the second detection result; the second detection result is sent to the main control unit 2. Test results.

In this embodiment, on the one hand, the narrowband detection and suppression unit mainly detects the acquired OFDM signal, that is, detects narrowband interference, so that the main control unit judges whether there is narrowband interference and whether the suppressed narrowband interference disappears according to the detection result. , so as to adjust the working mode of the narrowband detection and suppression unit. Wherein, the narrowband detection and suppression unit includes two working modes: parallel mode and series mode. On the other hand, the narrowband detection and suppression unit mainly suppresses narrowband interference.

When detecting narrowband interference, the narrowband detection and suppression unit can obtain a first detection result by detecting the obtained OFDM signal in parallel mode, so that the main control unit can determine whether there is narrowband interference according to the first detection result, If there is narrow-band interference, the main control unit switches the working mode of the narrow-band detection and suppression unit to a serial mode. Correspondingly, if the narrowband detection and suppression unit finds that the working mode has been switched from the parallel mode to the series mode, it indicates that there is narrowband interference.

When suppressing narrowband interference, the suppression of narrowband interference can be realized through the series mode.

When further detecting the suppressed narrowband interference, the narrowband detection and suppression unit can continue to obtain the second detection result by detecting the suppressed OFDM signal in series mode, so that the main control unit can be based on the second detection result. Determine if narrowband interference is still present. If the narrowband interference still exists, the main control unit does not switch the working mode of the narrowband detection and suppression unit; if there is no narrowband interference, the main control unit switches the working mode of the narrowband detection and suppression unit back to the parallel mode. Correspondingly, if the narrowband detection and suppression unit finds that the working mode is still in series mode, indicating that there is still narrowband interference, continue to suppress narrowband interference in series mode; if the narrowband detection and suppression unit finds that the working mode is switched back to parallel mode, It means that the narrowband interference no longer exists, then the obtained OFDM can continue to be detected in the parallel mode.

In some embodiments, when the narrowband detection and suppression unit initially detects OFDM signals, the initial working mode of the narrowband detection and suppression unit is parallel mode.

The premise of the narrowband detection and suppression unit detecting the OFDM signal is to ensure that the current state of the channel is an idle state, and whether the state of the channel is idle can be determined by the acquired synchronization state information, which may include: initial frame synchronization state, frame Synchronous state or bit synchronous state Three kinds of synchronous states.

In some embodiments, the narrowband detection and suppression unit can obtain synchronization state information from the synchronization unit, and the synchronization state information is used to refer to the current synchronization state of the synchronization unit.

In some embodiments, if any one of the initial frame synchronization state, the frame synchronization state or the bit synchronization state is not indicated in the synchronization state information, it may be determined that the current state of the channel is an idle state.

Wherein, the main control unit is used to receive the first detection result; determine whether there is narrow-band interference based on the first detection result; in response to the presence of narrow-band interference, switch the working mode of the narrow-band detection and suppression unit to the series mode; and receive the second detection Result; determining whether the suppressed narrowband interference disappears based on the second detection result.

In this embodiment, the main control unit is mainly responsible for making basic judgments on the detection results sent by the narrowband detection and suppression unit to determine whether there is narrowband interference and whether the suppressed narrowband interference disappears, that is, to judge whether there is narrowband interference based on the first detection result. Interference and judging whether the narrowband interference disappears according to the second detection result. At the same time, the main control unit can also control the working mode of the narrowband detection and suppression unit based on the judgment result, that is, when it is judged that there is narrowband interference, the working mode of the narrowband detection and suppression unit is switched to the series mode; when it is judged that there is no narrowband interference , switch the working mode of the narrowband detection and suppression unit to the parallel mode.

In some embodiments, the main control unit may be a CPU.

In the embodiment of the present disclosure, since the detection and suppression of narrowband interference use the same set of hardware devices, the implementation of the hardware device is relatively simple, and the detection of narrowband interference when the channel is idle takes advantage of the fact that the narrowband interference in the power line channel is slow. It avoids the detection error caused by the frequency selectivity of the power line channel. In addition, since the main control unit only makes basic decisions on narrowband interference, the performance requirements for the main control unit are also relatively low. Therefore, accurate detection and suppression of narrowband interference is realized with a simple device with low performance requirements.

In an optional implementation of this embodiment, the main control unit is further configured to configure multiple detection parameter groups for the narrowband detection and suppression unit based on the working frequency band of the narrowband detection and suppression unit, and the detection parameter group includes a narrowband center frequency point , notch bandwidth and power calculation length; wherein, the multiple narrowband center frequency points are different from each other, and the multiple narrowband center frequency points cover the working frequency band.

In this embodiment, the main control unit can configure multiple detection parameter sets for the narrowband detection and suppression unit, so that the narrowband detection and suppression unit can detect narrowband interference on the acquired OFDM signal based on the configured detection parameter sets. Wherein, the plurality of narrowband central frequency points included in the multiple configured detection parameter groups are different from each other, and these narrowband central frequency points just cover the working frequency band of the narrowband detection and suppression unit. Wherein, the multiple notch bandwidths included in the multiple configured detection parameter groups may be the same or different. Wherein, the multiple power calculation lengths included in the multiple configured detection parameter groups may be the same.

The structure of the narrowband detection and suppression unit will be described in detail below with reference to FIG. 2 and FIG. 3 .

In the embodiment of the present disclosure, the narrowband detection and suppression unit includes at least one narrowband component, and the narrowband component includes a wave notch filter and a power calculation unit.

Among them, the narrowband component has two working modes: parallel mode and series mode. The narrowband component can detect the obtained OFDM signal in parallel mode to determine whether there is narrowband interference, or suppress narrowband interference in series mode, and detect whether the suppressed narrowband interference disappears.

In some embodiments, the narrowband detection and suppression unit may include 5 narrowband components. In some embodiments, the wave trap included in each narrowband component may be an wireless impulse response digital filter (infinite impulse response digital filter, IIR) wave trap.

Fig. 2 shows a structural diagram of a narrowband component in a parallel mode according to an embodiment of the present disclosure.

As shown in Figure 2, for any narrowband component in the narrowband detection and suppression unit, the first end of the notch filter in the narrowband component is connected to the input end of the narrowband detection and suppression unit in parallel mode, and the notch filter The second end is connected to the second end of the power calculation unit in the narrowband component, and the first end of the power calculation unit is connected to the first end of the wave trap.

It can be understood that the narrowband component in the parallel mode does not process the OFDM signal, but only detects narrowband interference on the OFDM signal, and the narrowband detection is the same as the OFDM signal input and output by the suppression unit.

FIG. 3 shows a structural diagram of a narrowband component in series mode according to an embodiment of the present disclosure.

As shown in Figure 3, for any narrowband component in the narrowband detection and suppression unit, in the series mode, the first end of the trap filter in the narrowband component is connected to the first input terminal and the power calculation unit in the narrowband component respectively The first terminal is connected, and the second terminal of the trap is respectively connected with the second output terminal and the second terminal of the power calculation unit.

In some embodiments, when the narrowband detection and suppression unit includes a narrowband component, the first input terminal is the input terminal of the narrowband detection and suppression unit, and the second output terminal is the output terminal of the narrowband detection and suppression unit.

In some embodiments, when the narrowband detection and suppression unit includes multiple narrowband components and the narrowband component is located at the head end of the multiple narrowband components, the first input terminal is the input terminal of the narrowband detection and suppression unit, and the second output terminal is the first The first terminal or the second output terminal of the first trap filter in a narrowband component is the output terminal of the narrowband detection and suppression unit.

Wherein, the first narrowband component is located behind the narrowband component, and there is no other narrowband component between the first narrowband component and the narrowband component.

It can be understood that if the working mode of the first narrowband component is the series mode, then the second output terminal is the first end of the first trap filter in the first narrowband component; if the working mode of the first narrowband component is the parallel mode, then the second output The second output end is the output end of the narrowband detection and suppression unit.

In some embodiments, when the narrowband detection and suppression unit includes a plurality of narrowband components and the narrowband component is located in the middle of the multiple narrowband components, the first input end is the second end of the second trap in the second narrowband component, or The first input end is the input end of the narrowband detection and suppression unit; the second output end is the first end of the first notch filter in the first narrowband component, or the second output end is the output end of the narrowband detection and suppression unit.

Wherein, the second narrowband component is located before the narrowband component, the first narrowband component is located behind the narrowband component, and there are no other narrowband components between the first narrowband component and the narrowband component and between the second narrowband component and the narrowband component.

It can be understood that if the working mode of the second narrowband component is the series mode, then the first input end is the second end of the second trap filter in the second narrowband component; if the working mode of the second narrowband component is the parallel mode, then the first input terminal is One input end is the input end of the narrowband detection and suppression unit. Similarly, if the working mode of the first narrowband component is the series mode, then the second output terminal is the first end of the first trap filter in the first narrowband component; if the working mode of the first narrowband component is the parallel mode, then the second The second output end is the output end of the narrowband detection and suppression unit.

In some embodiments, when the narrowband detection and suppression unit includes a plurality of narrowband components and the narrowband component is located at the end of the plurality of narrowband components, the first input end is the second end of the second trap in the second narrowband component, or The first input end is the input end of the narrowband detection and suppression unit; the second output end is the output end of the narrowband detection and suppression unit.

Wherein, the second narrow belt component is located before the narrow belt component, and there is no other narrow belt component between the second narrow belt component and the narrow belt component.

It can also be understood that the narrowband components in series mode suppress narrowband interference, and the OFDM signals input and output by the narrowband detection and suppression unit are different, and the output of the narrowband detection and suppression unit is a suppressed OFDM signal.

The following is a further introduction to the functions of the narrowband components and the main control unit, so as to understand the implementation process of narrowband interference detection and suppression.

In an optional implementation of this embodiment, the narrowband component is used for

Obtaining at least one detection parameter set in parallel mode;

Determine the corresponding first signal power when the received OFDM signal is input to the first end of the notch filter in the narrowband component and the corresponding second signal power when the OFDM signal is output to the second end of the notch filter based on the detection parameter group;

generating a first detection result based on the first signal power and the second signal power;

Send at least one first detection result to the main control unit.

In this embodiment, when the narrowband detection and suppression unit initially detects the acquired OFDM signal, the working mode of each narrowband component is switched to the parallel mode by the main control unit. Since the main control unit pre-configures multiple detection parameter sets for the narrowband detection and suppression unit, each narrowband component can obtain at least one detection parameter set in parallel mode. When acquiring detection parameter sets, the detection parameter sets acquired by the narrowband components are different from each other, and the total number of detection parameter sets acquired by all the narrowband components is equal to the number of detection parameter sets pre-configured by the main control unit.

In some embodiments, the number of detection parameter sets obtained between the narrowband components is the same, that is, the same number of detection parameter sets are assigned to each narrowband component according to the number of detection parameter sets preconfigured by the main control unit and the number of narrowband components.

After each narrowband component obtains a certain number of detection parameter groups, each narrowband component can obtain at least one first detection result based on at least one detection parameter group obtained respectively, and each narrowband component will obtain at least one The first detection result is sent to the main control unit, so that the main control unit can obtain the same number of first detection results as the number of pre-configured detection parameter groups.

For example, if the main control unit is pre-configured with 100 detection parameter groups, and the number of narrowband components in the narrowband detection and suppression device is 5, then narrowband component A can obtain the 1st to 20th detection parameter groups, and narrowband component B can obtain the 1st to 20th detection parameter groups. 21 to 40 detection parameter groups, narrowband component C can obtain the 41st to 60th detection parameter group, narrowband component D can obtain the 61st to 80th detection parameter group, narrowband component E can obtain the 81st to 100th detection parameter group. Correspondingly, the narrowband component A sends the 1st to 20th first detection results to the main control unit, the narrowband component B sends the 21st to 40th first detection results to the main control unit, and the narrowband component C sends the 41st to 40th first detection results to the main control unit. For 60 first detection results, the narrowband component D sends the 61st to 80th first detection results to the main control unit, and the narrowband component E sends the 81st to 100th first detection results to the main control unit. Therefore, the main control unit obtains 100 first detection results.

It can be understood that the multiple narrowband center frequency points in the multiple detection parameter groups configured by the main control unit are different from each other. Therefore, the 100 first detection results also correspond to 100 narrowband center frequency points respectively.

For any narrowband component, when determining a corresponding first detection result according to a detection parameter group, since a narrowband center frequency point, a notch bandwidth and a power calculation length are indicated in the detection parameter group, it can be used in Under the narrowband center frequency point, the power calculation of the OFDM signal before and after the notch filter in the narrowband component is performed with the corresponding notch bandwidth, that is, the first power calculation is performed when the OFDM signal is input to the first end of the notch filter and the OFDM The second power calculation is performed when the signal is output from the second terminal of the notch filter. The power calculation in this embodiment can be done in an integral manner. Once the integral length is equal to the power calculation length indicated by the detection parameter set, the narrowband component will save the two power values before and after the notch filter. The first power integral when the OFDM signal is input to the first end of the notch filter is called the first signal power, and the second power integral when the OFDM signal is output to the second end of the notch filter is called the second signal power . Afterwards, the first signal power and the second signal power can form a first detection result, and the first detection result is a detection result under the narrowband center frequency point indicated by the detection parameter set. Therefore, the narrowband component can obtain at least one first detection result corresponding to the acquired at least one detection parameter set in this manner.

In some embodiments, during initial detection, the main control unit switches the working modes of all narrowband components in the narrowband detection and suppression unit to parallel mode.

In some embodiments, if the narrowband component does not obtain the detection parameter set, the narrowband component does not work.

In some embodiments, when the narrowband component sends the first detection result to the main control unit, it may also send the narrowband center frequency point corresponding to the first detection result to the main control unit.

In an optional implementation of this embodiment, the main control unit is used to

receiving a plurality of first detection results from at least one narrowband component;

Determining multiple interference signal-to-noise ratios based on a preset first formula according to multiple first detection results;

determining a preset number of target interference signal-to-noise ratios from a plurality of interference signal-to-noise ratios;

determining that narrowband interference exists in response to a target interference signal-to-noise ratio being less than a preset interference signal-to-noise ratio threshold; or,

In response to the target interference signal-to-noise ratio being greater than or equal to the interference signal-to-noise ratio threshold, determine a preset number of standard deviations corresponding to the target interference signal-to-noise ratio;

In response to the standard deviation being greater than a preset interference signal-to-noise ratio standard deviation threshold, it is determined that narrowband interference exists.

In this embodiment, after the main control unit receives the same number of first detection results as the configured detection parameter groups, that is, after receiving multiple first detection results from at least one narrowband component, it can then based on the multiple first detection results Test results to determine if narrowband interference exists. The main control unit can determine whether there is narrow-band interference through the following 1)~3).

1) For each first detection result, an interference signal-to-noise ratio corresponding to the first detection result can be obtained based on the first detection result and a preset first formula.

Wherein, the interference signal-to-noise ratio may also be referred to as the signal-to-interference-plus-noise ratio, which represents the ratio of the strength of the received useful OFDM signal to the strength of the received interference signal (noise and interference). In this embodiment, the interference signal-to-noise ratio can be represented by SINR ₀ . In some embodiments, the first formula is as follows:

SINR ₀ =10log ₁₀ (second signal power/(first signal power−second signal power));

It can be understood that, through the first formula, an interference signal-to-noise ratio equal to that of the first detection result can be obtained. For example, if the main control unit receives 100 first detection results, then 100 interference signal-to-noise ratios can be correspondingly obtained through the first formula.

2) Determining a preset number of target interference signal-to-noise ratios with the smallest value from the plurality of interference signal-to-noise ratios.

The main control unit may find several interference signal-to-noise ratios with the smallest values among the obtained multiple interference signal-to-noise ratios as the target interference signal-to-noise ratio. In some embodiments, the quantity of the target interference signal-to-noise ratio is determined by a preset quantity. In some embodiments, the preset number may be 8. For example, 8 interference signal-to-noise ratios with the smallest values may be found from 100 interference signal-to-noise ratios as target interference signal-to-noise ratios.

In some embodiments, before determining the target interference signal-to-noise ratio, the multiple interference signal-to-noise ratios may also be sorted according to their numerical values. That is, the target interference signal-to-noise ratio is determined again from the sorted multiple interference signal-to-noise ratios.

3) Comparing the target interference signal-to-noise ratio with a preset interference signal-to-noise ratio threshold to determine whether there is interference. At this time, the following cases 1 and 2 may exist.

Case 1: If at least one target interference signal-to-noise ratio among the preset number of target interference signal-to-noise ratios is smaller than a preset interference signal-to-noise ratio threshold, it indicates that narrowband interference exists.

Case 2: If each target interference SNR of the preset number of target interference SNRs is greater than or equal to the preset interference SNR threshold, it indicates that there is no narrowband interference in the channel or there are multiple narrowband interference.

Therefore, a corresponding standard deviation can be calculated according to a preset number of target interference signal-to-noise ratios, and the standard deviation can be compared with a preset interference signal-to-noise ratio standard deviation threshold, which can be further divided into the following case a and case b.

Case a: If the standard deviation is greater than the preset standard deviation threshold of the interference signal-to-noise ratio, it indicates that there are multiple narrow-band interferences with similar intensities.

Case b: If the standard deviation is less than or equal to the preset standard deviation threshold of the interference signal-to-noise ratio, it means that there is no narrowband interference. At this time, the main control unit does not need to switch the working mode of the narrowband component, so that it continues to detect narrowband interference in the parallel mode.

In some embodiments, the aforementioned interference signal-to-noise ratio threshold may be determined in the following manner:

SINR ₂ = SINR ₁ +△ _SINR0 ;

Among them, SINR ₂ is the interference signal-to-noise ratio threshold, SINR ₁ is the minimum interference signal-to-noise ratio that the narrowband interference detection and suppression device can tolerate, and △ _SINR0 is the first interference signal-to-noise ratio margin, which is used to prevent misjudgment of narrowband interference , △ _SINR0 >0.

It should be understood that the above threshold of the standard deviation of the interference signal-to-noise ratio can be set by those skilled in the art according to actual needs, and the present disclosure does not limit this, and all of them are within the scope of protection.

In an optional implementation of this embodiment, the main control unit is used to

In response to the existence of narrowband interference, determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio whose value is less than the interference signal-to-noise ratio threshold, or determine the target interference signal with the smallest value from the preset number of target interference signal-to-noise ratios. noise ratio, and determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio with the smallest value;

Determine the target narrowband component from at least one narrowband component based on the number of target narrowband center frequency points, the number of target narrowband components is less than or equal to the number of target narrowband center frequency points, and the target narrowband component is located at the front end of at least one narrowband component;

Switch the working mode of the target narrowband component to serial mode.

In this embodiment, when the main control unit determines that there is narrowband interference, the operating mode of the target narrowband component in the narrowband detection and suppression unit can be further switched to the series mode through the following 1) to 3), so that the target narrowband component is in the series mode. Suppress narrowband interference.

1) When it is determined that there is narrowband interference, determine the target narrowband center frequency point based on the following different situations.

Case 1, for the aforementioned preset number of target interference signal-to-noise ratios where at least one target interference signal-to-noise ratio is less than the preset interference signal-to-noise ratio threshold, the main control unit may, according to the locally stored detection parameter group-narrowband center frequency The corresponding relationship between the point-the first detection result-the interference signal-to-noise ratio determines the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio whose value is smaller than the interference signal-to-noise ratio threshold. It can be understood that narrowband interference exists at the target narrowband central frequency point.

For example, if target interference signal-to-noise ratio 1 and target interference signal-to-noise ratio 2 among the eight target interference signal-to-noise ratios are smaller than a preset interference signal-to-noise ratio threshold, it indicates that narrowband interference exists. Therefore, it can be determined that there is narrowband interference at the target narrowband central frequency point 1 corresponding to the target interference signal-to-noise ratio 1, and there is narrowband interference at the target narrowband central frequency point 2 corresponding to the target interference signal-to-noise ratio 2, and the six target There is no narrowband interference at the 6 target narrowband center frequency points corresponding to the interference signal-to-noise ratio.

Case 2, for the above-mentioned situation where the standard deviation is greater than the preset interference signal-to-noise ratio standard deviation threshold, the two target interference signal-to-noise ratios with the smallest value can be found from the preset number of target interference signal-to-noise ratios, and then the two Two target narrowband center frequency points corresponding to a target interference signal-to-noise ratio, that is, narrowband interference exists at the two target narrowband center frequency points.

2) Determine the target narrowband component based on the determined narrowband center frequency point.

After the main control unit determines the target narrowband central frequency point, it can further determine the target narrowband component that needs to switch the working mode from the plurality of narrowband components according to the number of target narrowband central frequency points. When determining the target narrowband component, the following two conditions need to be met.

One condition: the number of target narrowband components is at most the number of target narrowband center frequency points.

For example, if it is determined that the number of target narrowband center frequency points is 3, then one narrowband component can be selected from multiple narrowband components as the target narrowband component, so that the narrowband component can complete the narrowband analysis of the three target narrowband center frequency points. Interference suppression; you can also choose 2 narrowband components as the target narrowband component, so that one of the narrowband components can suppress the narrowband interference at one of the 3 target narrowband center frequency points; you can also choose 3 narrowband components The components serve as target narrowband components, so that each narrowband component can suppress narrowband interference at a target narrowband center frequency point.

It can be understood that when the narrowband detection and suppression unit includes only one narrowband component, the narrowband component is the target narrowband component.

Another condition: the target narrowband component is in front of multiple narrowband components. For example, the first two narrowband components among the five narrowband components are determined as target narrowband components.

3) Switch the working mode of the target narrowband component to series mode.

After determining the target narrowband component, the main control unit can switch the working mode of the target narrowband component from the parallel mode to the series mode, so that the target narrowband component suppresses the narrowband interference in the series mode. Correspondingly, if the narrowband detection and suppression unit finds that the working mode of the narrowband component is switched to the series mode, it can determine that there is narrowband interference accordingly.

In some embodiments, the main control unit can also locally find out the target detection parameter set corresponding to each target narrowband center frequency point, and send the target detection parameter set to the target narrowband component.

For example, the main control unit determines the target narrowband center frequency point 1, the target narrowband center frequency point 2 and the target narrowband center frequency point 3, and determines the target narrowband component 1, target narrowband component 2 and target narrowband component 3. Then, the main control unit can first find the target detection parameter group 1 corresponding to the target narrowband center frequency point 1, and send the target detection parameter group 1 to the target narrowband component 1; find the target detection parameter group corresponding to the target narrowband center frequency point 2 Parameter group 2, send the target detection parameter group 2 to the target narrowband component 2; find the target detection parameter group 3 corresponding to the target narrowband center frequency point 3, and send the target detection parameter group 3 to the target narrowband component 3.

In an optional implementation of this embodiment, the target narrowband component is used to

In the series mode, determine the corresponding first target signal power when the OFDM signal received at the target narrowband center frequency is input to the first end of the target notch filter in the target narrowband component and the second end of the OFDM signal output target wave filter The corresponding second target signal power at the terminal time;

generating a second detection result based on the first target signal power and the second target signal power;

Send the second detection result to the main control unit.

In this embodiment, when the working mode of the target narrowband component is switched from the parallel mode to the series mode, the narrowband interference can be suppressed through the target trap in the target narrowband component in the series mode. In the process of narrowband interference suppression, in order to monitor whether the narrowband interference disappears at any time, the target narrowband component can detect the OFDM signal at the target narrowband center frequency according to the preset time interval, and report the detection results to the main control unit regularly.

In any detection of the OFDM signal at the center frequency of the target narrowband by the target narrowband component, the detection method is the same as in the parallel mode, and the target narrowband component still determines the target narrowband calculated at the center frequency of the target narrowband in the series mode The two target power values before and after the component, the first target power integral when the OFDM signal is input to the first end of the target notch filter is called the first target signal power, and the first target power when the OFDM signal is output to the second end of the target notch filter The second target power integral is referred to as a second target signal power. Afterwards, the first target signal power and the second target signal power can form a second detection result, and the second detection result can indicate a detection result of the suppressed narrowband interference at a target narrowband center frequency point.

In some embodiments, if the number of target narrowband center frequency points assigned by the main control unit to a target narrowband component is at least two, then the target narrowband component can determine the corresponding second detection frequency for each target narrowband center frequency point. The results are sent to the main control unit respectively, or at least two second detection results corresponding to at least two target narrowband center frequency points are determined and then sent to the main control unit in a unified manner.

In an optional implementation of this embodiment, the main control unit is used to

receiving a second detection result of the target narrowband component;

determining the target interference signal-to-noise ratio based on the second detection result and the first formula;

In response to the target interference signal-to-noise ratio being greater than the sum of the interference signal-to-noise ratio threshold and a preset interference signal-to-noise ratio margin, it is determined that the narrowband interference at the target narrowband center frequency point disappears.

In this embodiment, each time the main control unit receives a second detection result, it also calculates the corresponding target interference signal-to-noise ratio based on the first formula introduced above. If the target interference signal-to-noise ratio is greater than the sum of the interference signal-to-noise ratio threshold and the preset interference signal-to-noise ratio margin, it means that the narrowband interference at the target narrowband center frequency indicated by the second detection result has disappeared; if the target The interference signal-to-noise ratio is less than or equal to the sum of the interference signal-to-noise ratio threshold and the preset interference signal-to-noise ratio margin, indicating that the narrowband interference at the target narrowband center frequency indicated by the second detection result has not disappeared.

In some embodiments, the preset interference signal-to-noise ratio margin is a preset second interference signal-to-noise ratio margin. The first interference signal-to-noise ratio margin and the second interference signal-to-noise ratio margin may be different. The first interference signal-to-noise ratio margin and the second interference signal-to-noise ratio margin can be set by those skilled in the art according to actual needs, and the present disclosure does not limit this, and both are within the scope of protection.

In some embodiments, when the narrowband interference at the target narrowband central frequency point disappears, the target interference signal-to-noise ratio satisfies the following conditions:

SINR _0` >SINR ₂ +△ _SINR1 ;

In some embodiments, when the narrowband interference at the target narrowband central frequency point does not disappear, the target interference signal-to-noise ratio satisfies the following conditions:

SINR _0` ≤ SINR ₂ + △ _SINR1 ;

Wherein, SINR ₂ is the interference signal-to-noise ratio threshold, △ _SINR1 is the second interference signal-to-noise ratio margin, △ _SINR1 > 0, and SINR _0` is the target interference signal-to-noise ratio.

In an optional implementation manner of this embodiment, the main control unit is further configured to switch the working mode of the target narrowband component sending the second detection result to the parallel mode in response to the narrowband interference disappearing.

In this embodiment, if the main control unit determines that the narrowband interference at the target narrowband center frequency indicated by the second detection result has disappeared, then switch the working mode of the target narrowband component sending the second detection result back to the parallel mode, Make it continue to detect narrowband interference.

In some embodiments, if a target narrowband component needs to suppress narrowband interference at least two target narrowband center frequency points, the main control unit may receive at least two second detection results sent by the target narrowband component, And when it is determined that each target interference signal-to-noise ratio of at least two target interference signal-to-noise ratios is greater than the sum of the interference signal-to-noise ratio threshold and the preset interference signal-to-noise ratio margin, then switch the working mode of the target narrowband component back to parallel mode.

In some embodiments, when the main control unit switches the working mode of a target narrowband component back to the parallel mode, if the target narrowband component is located at the head end or in the middle of multiple target narrowband components, then the When the working mode is switched back to the parallel mode, the target narrowband component is placed at the end of multiple target narrowband components. That is, the target narrowband components in serial mode are always located in front of multiple narrowband components, and the narrowband components in parallel mode are located behind all target narrowband components.

Fig. 4 shows another structural block diagram of a narrowband interference detection and suppression device for power line communication according to an embodiment of the present disclosure.

As shown in Figure 4, in addition to the narrowband detection and suppression unit and the main control unit shown in Figure 1, the device may also include: a sending unit, an analog front-end unit, an automatic gain control unit, a digital bandpass filter, and a synchronization unit and a demodulation and decoding unit.

The newly added units are introduced separately below.

Wherein, the sending unit is configured to generate and send OFDM signals based on the original data.

In this embodiment, when the sending unit obtains the original data to be sent, it can digitally encode and modulate the original data to generate an OFDM signal that can be used for power line communication. In some embodiments, the original data may include: original data of the frame control information and original data of the payload.

Wherein, the analog front-end unit is located behind the sending unit, and is used for performing signal amplification, filtering and analog/digital conversion processing on the received OFDM signal.

In this embodiment, the analog front-end unit may include: an analog-to-digital converter, a programmable gain amplifier, an analog band-pass filter, and a digital-to-analog converter. Among them, the analog bandpass filter is used to filter the received OFDM signal; the analog-to-digital converter is used to convert the OFDM signal from analog signal to digital signal; the programmable gain amplifier is used to amplify the OFDM signal; the digital-to-analog converter is used to The processed OFDM signal is converted from a digital signal to an analog signal and then output to an automatic gain control unit.

Wherein, the automatic gain control unit is located behind the analog front-end unit, and is used to adjust the gain of the analog front-end unit, so that the amplitude of the OFDM signal input to the automatic gain control unit falls within a preset demodulation range.

In this embodiment, the automatic gain control unit judges the amplitude of the received OFDM signal, and if the amplitude of the OFDM signal does not fall within the preset demodulation range, it can reversely adjust the programmable gain amplifier in the analog front-end unit The gain, so that the amplitude of the OFDM signal output by the analog front-end unit falls within the preset demodulation range, thereby improving the output signal-to-noise ratio of the analog-to-digital converter in the analog front-end unit. Wherein, the amplitude of the OFDM signal is the voltage value of the OFDM signal.

In some embodiments, the preset demodulation range is an optimal range suitable for the demodulation and decryption unit to perform demodulation.

The automatic gain control unit has three modes: normal adjustment mode, slow adjustment mode and stop adjustment mode. Among them, the normal adjustment mode adjusts the gain of the programmable gain amplifier at normal time intervals (for example, one adjustment per second); the slow adjustment mode adjusts the gain of the programmable gain amplifier at longer time intervals (for example, one adjustment per 10 seconds) ); stop adjustment mode to stop adjusting the gain of the programmable gain amplifier.

In some embodiments, when the automatic gain control unit enters the slow mode, it can increase the locally preset target power to increase the power of the received OFDM signal.

In some embodiments, the working mode of the automatic gain control unit can be adjusted based on the feedback from the digital bandpass filter, the narrowband detection and rejection unit and the synchronization unit.

Wherein, the digital band-pass filter is located after the automatic gain control unit, and is used to determine the corresponding first power when the received OFDM signal is input to the digital band-pass filter and the corresponding second power when the OFDM signal is output to the digital band-pass filter. Power; in response to the difference between the first power and the second power being greater than or equal to the preset power difference threshold, a first mode switching instruction is sent to the automatic gain control unit, and the first mode switching instruction is used to indicate that the working mode is switched to slow speed mode.

In this embodiment, the front end and the back end of the digital bandpass filter are respectively equipped with power calculation units, and the digital bandpass filter can determine the magnitude of out-of-band noise or interference power through these two power calculation units. When the digital bandpass filter receives the OFDM signal output from the automatic gain control unit, the first power corresponding to the OFDM signal just input to the digital bandpass filter can be determined through the front-end power calculation unit. After the digital band-pass filter filters the OFDM signal, when the filtered OFDM signal is about to be output to the digital band-pass filter, the second power corresponding to the OFDM signal at this time can be determined through the power calculation unit at the back end. If the difference between the first power and the second power is greater than or equal to the preset power difference threshold, it indicates that there is relatively large noise or narrowband interference out of band. Therefore, the digital bandpass filter feeds back the first mode switching instruction to the automatic gain control unit to instruct the automatic gain control unit to switch from the current working mode to the slow mode.

In some embodiments, the bandwidth of the digital bandpass filter can also be set according to the operating frequency band of the device shown in FIG. 2 .

Wherein, the synchronization unit, located behind the narrowband detection and suppression unit, is used to determine the current synchronization state of the synchronization unit based on the analysis of the received OFDM signal; and send synchronization state information to the narrowband detection and suppression unit based on the current synchronization state.

In this embodiment, the synchronization unit may determine the corresponding synchronization status according to the current analysis phase of the received OFDM signal. If it enters the process of normal frame reception to determine whether OFDM signals are received, it will enter the initial frame synchronization state; if it enters the process of judging whether the received OFDM signal is a real signal, it will enter the frame synchronization state; The process of the start and end positions of the OFDM signal will enter the bit synchronization state accordingly. If any one of the above three processes is not currently performed, the current state of the channel is considered to be an idle state. At this time, the synchronization state information fed back by the synchronization unit to the narrowband detection and suppression unit does not indicate any synchronization state. In some embodiments, when the current state of the channel is an idle state, the synchronization state information may be empty information.

In some embodiments, the synchronization unit can detect a legal physical layer protocol data unit according to the special structure of the OFDM signal preamble, and mark the boundaries of each part of the OFDM signal.

It can be understood that the synchronization unit only analyzes the OFDM signal, and the OFDM signal received by the synchronization unit is the same as the output OFDM signal.

Wherein, the demodulation and decoding unit is located after the synchronization unit, and is used to demodulate and decode the received OFDM signal, so as to determine the original data carried in the OFDM signal.

In this embodiment, the decryption demodulation unit can perform time-frequency conversion and frequency domain processing on the received OFDM signal to realize demodulation of the OFDM signal, and also perform bit and symbol level processing to realize the decoding of the OFDM signal. Therefore, the original data of the frame control information and the original data of the load are recovered.

In the device shown in Fig. 4, the narrowband detection and suppression unit, the synchronization unit and the main control unit may also have the following functions.

In some embodiments, the narrowband detection and suppression unit is further configured to send a first mode switching instruction to the automatic gain control unit in response to the working mode being switched to the series mode, and the first mode switching instruction is used to instruct to switch the working mode is the slow mode; in response to the working mode not being switched to the series mode, send a second mode switching instruction to the automatic gain control unit, where the second mode switching instruction is used to instruct switching the working mode to the normal mode.

In this embodiment, if the working mode of the narrowband detection and suppression unit is switched to the series mode, it can be determined that there is narrowband interference, and the first mode switching instruction for instructing to switch the working mode to the slow mode is fed back to the automatic gain control unit , so that the automatic gain control unit switches from the current working mode to the slow mode, so as to prevent oscillation caused by narrow-band interference. If the working mode of the narrowband detection and suppression unit is not switched to the series mode, it can be determined that there is no narrowband interference, and then feed back to the automatic gain control unit a second mode switching instruction for instructing to switch the working mode to the normal mode, so that The automatic gain control unit switches from the current working mode to the normal mode.

In some embodiments, the synchronization unit is further configured to send a third mode switching instruction to the automatic gain control unit in response to the synchronization state being the initial frame synchronization state, where the third mode switching instruction is used to instruct to switch the working mode to the stop mode .

In this embodiment, if the current synchronization state of the synchronization unit is the initial frame synchronization state, it indicates that the normal frame receiving process is currently entered, and the third mode for instructing to switch the working mode to the stop mode is fed back to the automatic gain control unit Toggle command to disable automatic gain control unit.

In some embodiments, if the synchronization state information sent by the synchronization unit to the narrowband detection and suppression unit indicates that it is currently in the initial frame synchronization state, the target narrowband component in the serial mode in the narrowband detection and suppression unit stops generating the second detection result, and has The generated second detection result is cleared, and the narrowband components in the parallel mode in the narrowband detection and suppression unit stop detection, and also stop sending the first detection result to the main control unit. The narrowband component in the parallel mode compares the length of the power calculation with the length of the symbol required for initial frame synchronization, discards the last few invalid narrowband detection first signal power and second signal power, and calculates the remaining effective first signal power and The second signal power is used to calculate the interference signal-to-noise ratio and judge the narrow-band interference. At the same time, the parameters in the detection parameter group are updated, so that the reception can be transferred to the normal frame wave frame listening stage, and the narrow-band detection is performed again.

In some embodiments, when the main control unit determines the operating frequency band of the narrowband detection and suppression unit, it can be based on the operating frequency band of the device shown in Figure 4, the analog band-pass filter and the digital band-pass filter in the analog front-end unit Characteristics (for example, passband, stopband, and transition band) determine the overall amplitude-frequency response, and then determine the operating frequency band of the narrow-band detection and suppression unit based on the overall amplitude-frequency response, which includes the corresponding passband and part of the overall amplitude-frequency response transition zone.

In some embodiments, the main control unit can also configure parameters of other units of the device shown in FIG. 4 .

In some embodiments, the main control unit can also realize the scheduling control of sending and receiving, that is, determine the time when the sending unit sends the OFDM signal, and the time when other units between the sending unit and the synchronization unit receive the OFDM signal. In some embodiments, the sending time and receiving time determined by the main control unit are staggered.

In some embodiments, while reporting the first detection result to the main control unit, the narrowband component can also report the gain value of the programmable gain amplifier adjusted by the automatic gain control unit to the main control unit at this time.

In the embodiment of the present disclosure, since the detection and suppression of narrowband interference use the same set of hardware devices, the implementation of the hardware device is relatively simple, and the detection of narrowband interference when the channel is idle takes advantage of the fact that the narrowband interference in the power line channel is slow. It avoids the detection error caused by the frequency selectivity of the power line channel. In addition, since the main control unit only makes basic decisions on narrowband interference, the performance requirements for the main control unit are also relatively low. Therefore, accurate detection and suppression of narrowband interference is realized with a simple device with low performance requirements.

The present disclosure also provides a power line communication narrowband interference detection and suppression method, and the method provided by the present disclosure will be introduced below with reference to FIG. 5 and FIG. 6 .

Fig. 5 shows a flow chart of a method for detecting and suppressing narrowband interference in power line communication according to an embodiment of the present disclosure. As shown in Figure 5, the method includes the following steps:

In step S501, OFDM signals and synchronization state information are acquired.

In step S502, when it is determined based on the synchronization state information that the current state of the channel is an idle state, the OFDM signal is detected in parallel mode to obtain a first detection result.

In step S503, the first detection result is sent to the main control unit.

In step S504, in response to switching the working mode of the narrowband detection and suppression unit to the series mode, narrowband interference suppression is performed in the series mode, and the suppressed OFDM signal is detected to obtain a second detection result.

In step S505, the second detection result is sent to the main control unit.

In an optional implementation of this embodiment, the detection of the OFDM signal in the parallel mode to obtain the first detection result includes:

Acquire multiple detection parameter groups in parallel mode;

Determine the corresponding first signal power when the received OFDM signal is input to the first end of the notch filter in the narrowband component and the corresponding second signal power when the OFDM signal is output to the second end of the notch filter based on the detection parameter set;

generating a first detection result based on the first signal power and the second signal power;

The sending the first detection result to the main control unit includes:

Send a plurality of first detection results to the main control unit.

In an optional implementation of this embodiment, the detection of the suppressed OFDM signal to obtain a second detection result includes:

Determining the corresponding first target signal power when the OFDM signal received at the target narrowband center frequency is input to the first end of the target notch filter of the target narrowband component in at least one narrowband component and the first target signal power of the OFDM signal output to the target notch filter The second target signal power corresponding to the two ends, the target narrowband component is a narrowband component whose working mode is switched to series mode in at least one narrowband component, and the target narrowband center frequency point is determined by the main control unit based on the first detection result. The narrowband center frequency point of ;

A second detection result is generated based on the first target signal power and the second target signal power.

In this embodiment, the above narrowband interference detection and suppression method for power line communication may be executed on the narrowband detection and suppression unit shown in FIG. 1 to FIG. 4 . It should be noted that the power line communication narrowband interference detection and suppression method in this embodiment corresponds to the function and effect of the narrowband detection and suppression unit introduced in Fig. 1 to Fig. repeat.

Fig. 6 shows another flow chart of a method for detecting and suppressing narrowband interference in power line communication according to an embodiment of the present disclosure. As shown in Figure 6, the method includes the following steps:

In step S601, receive a first detection result from the narrowband detection and suppression unit, and determine whether there is narrowband interference based on the first detection result.

In step S602, in response to the presence of narrowband interference, the working mode of the narrowband detection and suppression unit is switched to a series mode.

In step S603, a second detection result from the narrowband detection and suppression unit is received, and based on the second detection result, it is determined whether the suppressed narrowband interference disappears.

In step S604, in response to the disappearance of the narrowband interference, the working mode of the narrowband detection and suppression unit is switched to a parallel mode.

In an optional implementation manner of this embodiment, the receiving the first detection result from the narrowband detection and suppression unit, and determining whether there is narrowband interference based on the first detection result includes:

receiving a plurality of first detection results from at least one narrowband component in the narrowband detection and suppression unit;

Determining multiple interference signal-to-noise ratios based on a preset first formula according to multiple first detection results;

determining a preset number of target interference signal-to-noise ratios from a plurality of interference signal-to-noise ratios;

determining that narrowband interference exists in response to a target interference signal-to-noise ratio being less than a preset interference signal-to-noise ratio threshold; or,

In response to the target interference signal-to-noise ratio being greater than or equal to the interference signal-to-noise ratio threshold, determine a preset number of standard deviations corresponding to the target interference signal-to-noise ratio;

In response to the standard deviation being greater than a preset interference signal-to-noise ratio standard deviation threshold, it is determined that narrowband interference exists.

In an optional implementation of this embodiment, the switching the working mode of the narrowband detection and suppression unit to the series mode in response to the presence of narrowband interference includes:

In response to the presence of narrow-band interference, determine the target narrow-band center frequency point corresponding to the target interference signal-to-noise ratio whose value is less than the interference signal-to-noise ratio threshold, or determine the target interference signal-to-noise ratio with the smallest value from the preset number of target interference signal-to-noise ratios Ratio, and determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio with the smallest value;

Determine the target narrowband component from at least one narrowband component based on the number of target narrowband center frequency points, the number of target narrowband components is less than or equal to the number of target narrowband center frequency points, and the target narrowband component is located at the front end of at least one narrowband component;

The working mode of the target narrowband component in the narrowband detection and suppression unit is switched to a series mode.

In an optional implementation of this embodiment, the receiving the second detection result from the narrowband detection and suppression unit, and determining whether the suppressed narrowband interference disappears based on the second detection result includes:

receiving a second detection result from the target narrowband component in the narrowband detection and suppression unit;

determining the target interference signal-to-noise ratio based on the second detection result and the first formula;

In response to the target interference signal-to-noise ratio being greater than the sum of the interference signal-to-noise ratio threshold and a preset interference signal-to-noise ratio margin, it is determined that the narrowband interference at the target narrowband center frequency point disappears.

In an optional implementation of this embodiment, the switching the working mode of the narrowband detection and suppression unit to the parallel mode in response to the disappearance of the narrowband interference includes:

In response to the disappearance of the narrowband interference, the working mode of the target narrowband component sending the second detection result is switched to a parallel mode.

In an optional implementation manner of this embodiment, the method further includes:

Based on the working frequency band of the narrowband detection and suppression unit, a plurality of detection parameter groups are configured for the narrowband detection and suppression unit, and the detection parameter groups include a narrowband center frequency point, a notch bandwidth and a power calculation length; wherein, a plurality of narrowband center frequency points are different from each other The same, and multiple narrowband center frequency points cover the working frequency band.

In this embodiment, the above method for detecting and suppressing narrowband interference in power line communication can be executed on the main control unit shown in FIG. 1 or FIG. 4 . It should be noted that the power line communication narrowband interference detection and suppression method in this embodiment corresponds to the functions and effects of the main control unit introduced in FIG. 1 or FIG. 4 , and details can be found in the previous description, which will not be repeated here.

As another aspect, the present disclosure also provides a chip, which includes at least one processor, which can be used to implement the functions involved in the main control unit or the narrowband detection and suppression unit in FIG. 1 or FIG. 4 .

In a possible design, the chip further includes a memory for storing program instructions and data, and the memory is located inside or outside the processor.

As another aspect, the present disclosure also provides a computer-readable storage medium. The computer-readable storage medium may be the computer-readable storage medium included in the device described in the above-mentioned embodiments; A computer-readable storage medium assembled in a device. The computer-readable storage medium stores one or more programs, and the programs are used by one or more processors to execute the methods described in the present disclosure.

As another aspect, the present disclosure also provides a computer program product, including a computer program/instruction, and when the computer program/instruction is allowed, a power line communication narrowband interference detection and suppression method is implemented.

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in a roadmap or block diagram may represent a module, program segment, or part of code that contains one or more Executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified functions or operations , or may be implemented by a combination of dedicated hardware and computer instructions.

The units or modules involved in the embodiments described in the present disclosure may be implemented by means of software or hardware. The described units or modules may also be set in the processor, and the names of these units or modules do not constitute limitations on the units or modules themselves in some cases.

The above description is only a preferred embodiment of the present disclosure and an illustration of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in this disclosure is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but should also cover the technical solutions made by the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of or equivalent features thereof. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this disclosure.

Claims (31)

1. A power line communication narrowband interference detection and suppression device, characterized in that, comprising: a narrowband detection and suppression unit and a main control unit; The narrowband detection and suppression unit is used to acquire OFDM signals and synchronization state information; when it is determined that the current state of the channel is an idle state based on the synchronization state information, the OFDM signal is detected in parallel mode to obtain the first detection result; sending the first detection result to the main control unit; and in response to switching the working mode to the series mode, performing narrowband interference suppression in the series mode, and detecting the suppressed OFDM signal, and obtaining the first Two detection results; sending the second detection result to the main control unit; The main control unit is configured to receive the first detection result; determine whether there is narrowband interference based on the first detection result; and switch the working mode of the narrowband detection and suppression unit to series mode; and receiving the second detection result; determining whether the suppressed narrowband interference disappears based on the second detection result. 2. The device according to claim 1, wherein the main control unit is further configured to configure multiple detection parameter groups for the narrowband detection and suppression unit based on the operating frequency band of the narrowband detection and suppression unit, The detection parameter set includes a narrowband central frequency point, a notch bandwidth, and a power calculation length; wherein, the multiple narrowband central frequency points are different from each other, and the multiple narrowband central frequency points cover the working frequency band. 3. The device according to claim 2, wherein the narrowband detection and suppression unit comprises at least one narrowband component, and the narrowband component comprises a wave trap and a power calculation unit; In the parallel connection mode, the first end of the wave notch filter in the narrowband component is connected to the input end of the narrowband detection and suppression unit, and the second end of the wave notch filter is connected to the input end of the narrowband component. The second end of the power calculation unit is connected, and the first end of the power calculation unit is connected to the first end of the wave trap; In the series mode, the first end of the wave notch filter in the narrowband component is respectively connected to the first input end and the first end of the power calculation unit in the narrowband component, and the notch The second terminal of the device is respectively connected with the second output terminal and the second terminal of the power calculation unit. 4. The device according to claim 3, wherein when the narrowband detection and suppression unit comprises a narrowband component, the first input terminal is the input terminal of the narrowband detection and suppression unit, and the second The output terminal is the output terminal of the narrowband detection and suppression unit. 5. The device according to claim 3, wherein the narrowband detection and suppression unit comprises a plurality of narrowband components and when the narrowband component is located at the head end of the plurality of narrowband components, the first input end is the input end of the narrowband detection and suppression unit, the second output end is the first end of the first notch filter in the first narrowband component, or the second output end is the input end of the narrowband detection and suppression unit Output end; wherein, the first narrowband component is located behind the narrowband component, and there is no other narrowband component between the first narrowband component and the narrowband component. 6. The device according to claim 3, wherein the narrowband detection and suppression unit comprises a plurality of narrowband components and when the narrowband component is located in the middle of the plurality of narrowband components, the first input terminal is The second end of the second notch filter in the second narrowband assembly, or the first input end is the input end of the narrowband detection and suppression unit; the second output end is the first notch wave in the first narrowband assembly The first terminal of the device, or the second output terminal is the output terminal of the narrowband detection and suppression unit; wherein, the second narrowband component is located before the narrowband component, and the first narrowband component is located in the narrowband After the assembly, there are no other narrow belt components between the first narrow belt component and the narrow belt component and between the second narrow belt component and the narrow belt component. 7. The device according to claim 3, wherein the narrowband detection and suppression unit comprises a plurality of narrowband components and when the narrowband component is located at the end of the plurality of narrowband components, the first input terminal is The second end of the second notch filter in the second narrowband component, or the first input end is the input end of the narrowband detection and suppression unit; the second output end is the output of the narrowband detection and suppression unit end; wherein, the second narrowband component is located in front of the narrowband component, and there is no other narrowband component between the second narrowband component and the narrowband component. 8. The device according to claim 3, wherein the narrow band assembly is used for acquiring at least one detection parameter set in a parallel mode; Determine the corresponding first signal power when the received OFDM signal is input to the first end of the wave notch filter in the narrowband component and the corresponding first signal power when the OFDM signal is output to the second end of the wave notch filter based on the detection parameter group Two signal power; generating the first detection result based on the first signal power and the second signal power; Sending at least one of the first detection results to the main control unit. 9. The device according to claim 8, wherein the main control unit is configured to receiving a plurality of said first detection results from at least one of said narrowband components; Determining multiple interference signal-to-noise ratios based on a preset first formula according to multiple first detection results; determining a preset number of target interference signal-to-noise ratios from the plurality of interference signal-to-noise ratios; determining that narrowband interference exists in response to the target interference signal-to-noise ratio being less than a preset interference signal-to-noise ratio threshold; or, In response to the target interference signal-to-noise ratio being greater than or equal to the interference signal-to-noise ratio threshold, determine a preset number of standard deviations corresponding to the target interference signal-to-noise ratio; In response to the standard deviation being greater than a preset interference signal-to-noise ratio standard deviation threshold, it is determined that narrowband interference exists. 10. The device according to claim 9, wherein the main control unit is configured to In response to the existence of narrowband interference, determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio whose value is less than the interference signal-to-noise ratio threshold, or determine the minimum of two values from the preset number of the target interference signal-to-noise ratio The target interference signal-to-noise ratio of , And determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio with the smallest value; Determine a target narrowband component from the at least one narrowband component based on the number of target narrowband center frequency points, the number of the target narrowband component is less than or equal to the number of target narrowband center frequency points, and the target narrowband component at the front end of the at least one narrowband assembly; Switch the working mode of the target narrowband component to a series mode. 11. The device according to claim 10, wherein the target narrowband assembly is used for Determine the corresponding first target signal power when the OFDM signal received at the target narrowband central frequency point is input to the first end of the target notch filter in the target narrowband component in the series mode and the OFDM signal is output to the target The corresponding second target signal power at the second end of the notch filter; generating a second detection result based on the first target signal power and the second target signal power; Sending the second detection result to the main control unit. 12. The device according to claim 11, wherein the main control unit is configured to receiving the second detection result of the target narrowband component; determining a target interference signal-to-noise ratio based on the second detection result and the first formula; In response to the target interference signal-to-noise ratio being greater than the sum of the interference signal-to-noise ratio threshold and a preset interference signal-to-noise ratio margin, determine that the narrowband interference at the target narrowband center frequency point disappears. 13. The device according to claim 12, wherein the main control unit is also used to In response to the narrowband interference disappearing, switch the working mode of the target narrowband component sending the second detection result to a parallel mode. 14. The device according to any one of claims 1 to 13, further comprising: a sending unit, configured to generate and send an OFDM signal based on the original data. 15. The device according to claim 14, further comprising: An analog front-end unit, located behind the sending unit, is used to perform signal amplification, filtering and analog-to-digital conversion processing on the received OFDM signal. 16. The device according to claim 15, further comprising: An automatic gain control unit, located behind the analog front-end unit, is used to adjust the gain of the analog front-end unit, so that the amplitude of the OFDM signal input to the automatic gain control unit falls within a preset demodulation range. 17. The device according to claim 16, further comprising: A digital band-pass filter, located after the automatic gain control unit, is used to determine the corresponding first power when the received OFDM signal is input to the digital band-pass filter and the corresponding second power when the OFDM signal is output to the digital band-pass filter. power; In response to the difference between the first power and the second power being greater than or equal to a preset power difference threshold, a first mode switching instruction is sent to the automatic gain control unit, and the first mode switching instruction is used to instruct switching the working mode to the slow mode . 18. The device according to claim 16, wherein the narrowband detection and suppression unit is further configured to send a first mode switching instruction to the automatic gain control unit in response to the working mode being switched to the series mode, The first mode switching instruction is used to instruct to switch the working mode to the slow mode; In response to the working mode not being switched to the series mode, a second mode switching instruction is sent to the automatic gain control unit, and the second mode switching instruction is used to instruct switching the working mode to the normal mode. 19. The device according to claim 18, further comprising: A synchronization unit, located after the narrowband detection and suppression unit, is configured to determine the current synchronization state of the synchronization unit based on the analysis of the received OFDM signal; send the narrowband detection and suppression unit based on the current synchronization state Synchronization status information described above. 20. The device according to claim 19, wherein the synchronization unit is further configured to send a third mode switching instruction to the automatic gain control unit in response to the synchronization state being an initial frame synchronization state, the The third mode switch instruction is used to instruct to switch the working mode to the stop mode. 21. The device according to claim 20, further comprising: The demodulation and decoding unit, located after the synchronization unit, is used to demodulate and decode the received OFDM signal, so as to determine the original data carried in the OFDM signal. 22. A power line communication narrowband interference detection and suppression method, characterized in that it is applied to a narrowband detection and suppression unit including at least one narrowband component, the method comprising: Obtain OFDM signal and synchronization status information; When it is determined that the current state of the channel is an idle state based on the synchronization state information, the OFDM signal is detected in parallel mode to obtain a first detection result; sending the first detection result to the main control unit; In response to switching the working mode of the narrowband detection and suppression unit to a series mode, narrowband interference suppression is performed in the series mode, and the suppressed OFDM signal is detected to obtain a second detection result; Sending the second detection result to the main control unit. 23. The method according to claim 22, wherein said detecting said OFDM signal in a parallel mode to obtain a first detection result comprises: Acquire multiple detection parameter groups in parallel mode; Determine the corresponding first signal power when the received OFDM signal is input to the first end of the wave notch filter in the narrowband component and the corresponding first signal power when the OFDM signal is output to the second end of the wave notch filter based on the detection parameter group Two signal power; generating the first detection result based on the first signal power and the second signal power; The sending the first detection result to the main control unit includes: Sending multiple first detection results to the main control unit. 24. The method according to claim 22 or 23, wherein said detection of the suppressed OFDM signal to obtain a second detection result comprises: determining the corresponding first target signal power when the OFDM signal received at the target narrowband center frequency is input to the first end of the target notch filter of the target narrowband component in the at least one narrowband component and the OFDM signal outputting the target notch The second terminal of the oscilloscope is the corresponding second target signal power, the target narrowband component is the narrowband component whose working mode is switched to series mode in the at least one narrowband component, and the target narrowband center frequency point is the main The control unit determines the narrowband central frequency point where narrowband interference exists based on the first detection result; The second detection result is generated based on the first target signal power and the second target signal power. 25. A power line communication narrowband interference detection and suppression method, characterized in that it is applied to a main control unit, and the method includes: receiving a first detection result from the narrowband detection and suppression unit, and determining whether there is narrowband interference based on the first detection result; In response to the presence of narrowband interference, switching the working mode of the narrowband detection and suppression unit to a series mode; receiving a second detection result from the narrowband detection and suppression unit, and determining whether the suppressed narrowband interference disappears based on the second detection result; In response to the disappearance of the narrowband interference, the working mode of the narrowband detection and suppression unit is switched to a parallel mode. 26. The method according to claim 25, wherein the receiving the first detection result from the narrowband detection and suppression unit, and determining whether there is narrowband interference based on the first detection result, comprises: receiving a plurality of first detection results from at least one narrowband component in the narrowband detection and suppression unit; Determining multiple interference signal-to-noise ratios based on a preset first formula according to multiple first detection results; determining a preset number of target interference signal-to-noise ratios from the plurality of interference signal-to-noise ratios; determining that narrowband interference exists in response to the target interference signal-to-noise ratio being less than a preset interference signal-to-noise ratio threshold; or, In response to the target interference signal-to-noise ratio being greater than or equal to the interference signal-to-noise ratio threshold, determine a preset number of standard deviations corresponding to the target interference signal-to-noise ratio; In response to the standard deviation being greater than a preset interference signal-to-noise ratio standard deviation threshold, it is determined that narrowband interference exists. 27. The method according to claim 26, wherein the switching the operating mode of the narrowband detection and suppression unit to a series mode in response to the presence of narrowband interference comprises: In response to the presence of narrowband interference, determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio whose value is less than the interference signal-to-noise ratio threshold, or determine the two minimum values from the preset number of the target interference signal-to-noise ratio Target interference signal-to-noise ratio, and determine the target narrowband center frequency point corresponding to the target interference signal-to-noise ratio with the smallest value; Determine a target narrowband component from the at least one narrowband component based on the number of target narrowband center frequency points, the number of the target narrowband component is less than or equal to the number of target narrowband center frequency points, and the target narrowband component at the front end of the at least one narrowband assembly; Switching the working mode of the target narrowband component in the narrowband detection and suppression unit to a series mode. 28. The method according to claim 27, wherein the receiving the second detection result from the narrowband detection and suppression unit, and determining whether the suppressed narrowband interference disappears based on the second detection result comprises: receiving a second detection result from the target narrowband component in the narrowband detection and suppression unit; determining a target interference signal-to-noise ratio based on the second detection result and the first formula; In response to the target interference signal-to-noise ratio being greater than the sum of the interference signal-to-noise ratio threshold and a preset interference signal-to-noise ratio margin, determine that the narrowband interference at the target narrowband center frequency point disappears. 29. The method according to claim 28, wherein in response to the disappearance of the narrowband interference, switching the operating mode of the narrowband detection and suppression unit to a parallel mode comprises: In response to the narrowband interference disappearing, switch the working mode of the target narrowband component sending the second detection result to a parallel mode. 30. The method according to any one of claims 25 to 29, further comprising: Configure multiple detection parameter groups for the narrowband detection and suppression unit based on the operating frequency band of the narrowband detection and suppression unit, the detection parameter groups include narrowband center frequency points, notch bandwidths, and power calculation lengths; The narrowband central frequency points are different from each other, and multiple narrowband central frequency points cover the working frequency band. 31. A chip, characterized by comprising: at least one processor, configured to implement the functions involved in the method according to any one of claims 22 to 30.