CN118041393A - Method and device for suppressing narrow-band interference signals, electronic equipment and storage medium - Google Patents
Method and device for suppressing narrow-band interference signals, electronic equipment and storage medium Download PDFInfo
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Abstract
The application provides a method, a device, electronic equipment and a storage medium for suppressing a narrowband interference signal, wherein the method comprises the following steps: the method comprises the steps of cutting out a signal to be detected from a baseband signal which is formed by aliasing of a broadband signal and a narrowband interference signal; segmenting a signal to be detected to obtain a segmented signal; filtering wideband signals in the segmented signals through a first filter to obtain filtered signals; calculating a first power value of the narrowband interference signal; calculating the difference value between the first power value and the target power value to obtain a second power value of the narrowband interference signal to be suppressed; calculating coefficients of a second filter according to the bandwidth of the narrowband wireless communication mode, the sampling frequency of the baseband signal, the second power value and the frequency of the narrowband interference signal; and the power of the narrow-band interference signal in the baseband signal is restrained through a second filter, so that the signal after narrow-band interference restraint is obtained. By the method, the communication performance of the receiving equipment is improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and apparatus for suppressing a narrowband interference signal, an electronic device, and a storage medium.
Background
With the rapid development of wireless communication technologies, various wireless communication modes are being developed, such as wireless local area networks (Wireless Local Area Network, WLAN), 2G (second generation mobile communication technology), 3G (third generation mobile communication technology), 4G (fourth generation mobile communication technology), 5G (fifth generation mobile communication technology), and the like. Each wireless communication mode corresponds to a frequency point and a frequency spectrum, wherein the frequency point is used as a center point of the frequency spectrum. Each wireless communication scheme communicates within a respective spectral range. The width of the frequency spectrum is used as the bandwidth, and the bandwidth of the wireless communication mode is longer, namely the frequency spectrum range is wider, so that the bandwidth of the wireless communication mode belongs to the broadband, and the transmission signal of the wireless communication transmission mode belongs to the broadband signal; some wireless communication systems have a short bandwidth, i.e., a small frequency spectrum range, and the bandwidth of the wireless communication system belongs to a narrow band, and the transmission signal of the wireless communication transmission system belongs to a narrow band signal.
With the gradual shortage of spectrum resources in wireless communication, spectrum sharing (that is, spectrum overlapping) exists between spectrums in different wireless communication modes, and the problem of increasingly tense spectrum resources can be solved through spectrum sharing. However, when there is spectrum sharing between one broadband wireless transmission scheme (the wireless transmission scheme in which the bandwidth belongs to a broadband) and one narrowband wireless communication scheme (the wireless communication scheme in which the bandwidth belongs to a narrowband), and the spectrum of the narrowband wireless communication scheme is completely within the spectrum range of the broadband wireless communication scheme, the receiving device receives the narrowband signal of the narrowband wireless communication scheme at the same time when receiving the broadband signal by the broadband wireless transmission scheme, that is, the signal received by the receiving device is an aliasing of the broadband signal and the narrowband signal, and the narrowband signal received by the receiving device belongs to an interference signal. When the narrowband interference signal exceeds a certain strength, the communication performance (e.g., signal reception quality, reception speed, etc.) of the receiving apparatus is affected.
Disclosure of Invention
In view of the above, an object of the present application is to provide a method, an apparatus, an electronic device, and a storage medium for suppressing a narrowband interference signal transmitted by a narrowband wireless communication scheme, so as to improve communication performance of a receiving device by suppressing the received narrowband interference signal when spectrum sharing exists between the narrowband wireless communication scheme and the narrowband wireless communication scheme.
In a first aspect, an embodiment of the present application provides a method for suppressing a narrowband interference signal, including:
intercepting a baseband signal with a specified length from received baseband signals formed by aliasing of broadband signals and narrowband interference signals as a signal to be detected;
segmenting the signal to be detected to obtain segmented signals of a preset number of segments; the length of each segment of the segmented signal is a preset length;
calculating coefficients of a first filter according to the sampling frequency of the baseband signal, the preset length, the preset quantity and the frequency of the narrowband interference signal to obtain the first filter;
for each segment of the segmented signal, filtering the segmented signal through the first filter to filter broadband signals in the segmented signal, so as to obtain a filtered signal after the segmented signal is filtered;
Calculating the power value of the filtering signal according to the signal at the target sampling point in the filtering signal and the coefficient of the first filter so as to calculate the average value according to the power values of all the filtering signals and obtain the first power value of the narrowband interference signal;
Calculating the difference value between the first power value and the target power value to obtain a second power value of which the narrowband interference signal needs to be suppressed; the target power value is a power value after a preset narrow-band interference signal is restrained;
Calculating coefficients of a second filter according to the bandwidth of the narrowband wireless communication mode, the sampling frequency of the baseband signal, the second power value and the frequency of the narrowband interference signal to obtain the second filter; wherein the narrowband interference signal is received by the narrowband wireless communication mode;
Transmitting the baseband signal to the second filter, and suppressing the power of the narrowband interference signal in the baseband signal by the second filter so as to suppress the first power value of the narrowband interference signal in the baseband signal to the target power value, thereby obtaining a signal after narrowband interference suppression.
With reference to the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, where the intercepting, from a received baseband signal that is formed by aliasing a wideband signal and a narrowband interference signal, a baseband signal with a specified length as a signal to be detected includes:
calculating the appointed length of the baseband signal to be intercepted based on the preset quantity and the preset length which are preset;
And intercepting the baseband signal according to the specified length to obtain the baseband signal with the specified length as the signal to be detected.
With reference to the first aspect or the first possible implementation manner of the first aspect, the embodiment of the present application provides a second possible implementation manner of the first aspect, where the segmenting the signal to be detected to obtain a segmented signal of a preset number of segments includes:
And carrying out average segmentation on the signal to be detected based on the preset quantity and/or the preset length to obtain segmented signals of the preset quantity of segments.
With reference to the first aspect, an embodiment of the present application provides a third possible implementation manner of the first aspect, where calculating the coefficient of the first filter according to the sampling frequency of the baseband signal, the preset length, and the preset number includes:
The bin index value k is calculated by the following formula:
Wherein L represents the preset length of the segment signal; f represents the frequency of the narrowband interference signal; fs represents the sampling frequency of the baseband signal;
The transfer function H 1 (z) of the z-transform of the first filter is calculated by the following formula:
Wherein j represents a complex unit; n represents the preset number of the segment signals;
The coefficients of the first filter are calculated by the following formula:
Where a 1 represents the denominator of the coefficients of the first filter and b 1 represents the numerator of the coefficients of the first filter.
With reference to the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first aspect, wherein the target sampling point includes the last two sampling points in the filtered signal; the calculating the power value of the filtered signal according to the signal at the target sampling point in the filtered signal and the coefficient of the first filter comprises the following steps:
The power value of each filtered signal is calculated by the following formula:
Wherein m represents the sequence number of each section of filtering signal in the baseband signal; n represents the sequence number of each sampling point in the baseband signal; n represents the preset quantity; l represents the preset length, wherein the preset length is the number of sampling points in each segment of the segmented signal; p m denotes the power value of the mth filtered signal; y m (n) represents a signal at a sampling point of sequence number n in the mth filtered signal; y m (n-1) represents the signal at the sampling point with the sequence number n-1 in the mth filtered signal; b 1 is the coefficient of the first filter.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present application provides a fifth possible implementation manner of the first aspect, where the calculating a mean value according to power values of all the filtered signals to obtain a first power value of a narrowband interference signal includes:
Calculating a first power value of the narrowband interference signal by the following formula:
Where p represents a first power value of the narrowband interfering signal.
With reference to the first aspect, an embodiment of the present application provides a sixth possible implementation manner of the first aspect, where calculating, according to a bandwidth of a narrowband wireless communication manner, a sampling frequency of the baseband signal, the second power value, and a frequency of the narrowband interference signal, coefficients of a second filter includes:
the normalized gain value of the coefficients of the second filter is calculated by the following formula:
Wherein G represents a normalized gain value of the coefficient of the second filter; g B=10-1/20;f0 denotes a bandwidth of the narrowband wireless communication scheme; fs represents the sampling frequency of the baseband signal;
the attenuation depth factor of the second filter is calculated by the following formula:
Wherein r represents the attenuation depth factor of the second filter; Representing the second power value;
The z-variation transfer function H 1 (z) of the second filter is calculated by the following formula:
wherein j represents a complex unit; f represents the frequency of the narrowband interference signal;
the coefficients of the second filter are obtained by the following formula:
Where d 1、d2、c1、c2 is the coefficient of the second filter.
In a second aspect, an embodiment of the present application further provides a device for suppressing a narrowband interference signal, including:
The intercepting module is used for intercepting a baseband signal with a specified length from received baseband signals formed by aliasing of broadband signals and narrowband interference signals as a signal to be detected;
the segmentation module is used for segmenting the signal to be detected to obtain segmented signals with a preset number of segments; the length of each segment of the segmented signal is a preset length;
the first calculation module is used for calculating coefficients of a first filter according to the sampling frequency of the baseband signal, the preset length, the preset quantity and the frequency of the narrowband interference signal to obtain the first filter;
the filtering module is used for filtering the segmented signals through the first filter aiming at each segment of the segmented signals so as to filter broadband signals in the segmented signals and obtain filtered signals after the segmented signals are filtered;
The second calculation module is used for calculating the power value of the filtering signal according to the signal at the target sampling point in the filtering signal and the coefficient of the first filter so as to calculate the average value according to the power values of all the filtering signals and obtain the first power value of the narrowband interference signal;
The third calculation module is used for calculating the difference value between the first power value and the target power value to obtain a second power value of which the narrowband interference signal needs to be suppressed; the target power value is a power value after a preset narrow-band interference signal is restrained;
A fourth calculation module, configured to calculate a coefficient of a second filter according to a bandwidth of a narrowband wireless communication mode, a sampling frequency of the baseband signal, the second power value, and a frequency of the narrowband interference signal, so as to obtain the second filter; wherein the narrowband interference signal is received by the narrowband wireless communication mode;
And the suppression module is used for transmitting the baseband signal to the second filter, and suppressing the power of the narrowband interference signal in the baseband signal through the second filter so as to suppress the first power value of the narrowband interference signal in the baseband signal to the target power value, thereby obtaining a signal subjected to narrowband interference suppression.
With reference to the second aspect, an embodiment of the present application provides a first possible implementation manner of the second aspect, where the intercepting module is configured to intercept, when a baseband signal with a specified length is taken as a signal to be detected from received baseband signals that are aliased by a wideband signal and a narrowband interference signal, specifically:
calculating the appointed length of the baseband signal to be intercepted based on the preset quantity and the preset length which are preset;
And intercepting the baseband signal according to the specified length to obtain the baseband signal with the specified length as the signal to be detected.
With reference to the second aspect or the first possible implementation manner of the second aspect, an embodiment of the present application provides a second possible implementation manner of the second aspect, where the segmentation module is configured to, when used to segment the signal to be detected, obtain a segmented signal with a preset number of segments, specifically is configured to:
And carrying out average segmentation on the signal to be detected based on the preset quantity and/or the preset length to obtain segmented signals of the preset quantity of segments.
With reference to the second aspect, an embodiment of the present application provides a third possible implementation manner of the second aspect, where the first calculating module is configured to, when calculating the coefficient of the first filter according to the sampling frequency of the baseband signal, the preset length, the preset number, and the frequency of the narrowband interference signal, specifically:
The bin index value k is calculated by the following formula:
Wherein L represents the preset length of the segment signal; f represents the frequency of the narrowband interference signal; fs represents the sampling frequency of the baseband signal;
The transfer function H 1 (z) of the z-transform of the first filter is calculated by the following formula:
Wherein j represents a complex unit; n represents the preset number of the segment signals;
The coefficients of the first filter are calculated by the following formula:
Where a 1 represents the denominator of the coefficients of the first filter and b 1 represents the numerator of the coefficients of the first filter.
With reference to the second aspect, an embodiment of the present application provides a fourth possible implementation manner of the second aspect, wherein the target sampling point includes a last two sampling points in the filtered signal; the second calculation module is specifically configured to, when calculating the power value of the filtered signal according to the signal at the target sampling point in the filtered signal and the coefficient of the first filter:
The power value of each filtered signal is calculated by the following formula:
Wherein m represents the sequence number of each section of filtering signal in the baseband signal; n represents the sequence number of each sampling point in the baseband signal; n represents the preset quantity; l represents the preset length, wherein the preset length is the number of sampling points in each segment of the segmented signal; p m denotes the power value of the mth filtered signal; y m (n) represents a signal at a sampling point of sequence number n in the mth filtered signal; y m (n-1) represents the signal at the sampling point with the sequence number n-1 in the mth filtered signal; b 1 is the coefficient of the first filter.
With reference to the fourth possible implementation manner of the second aspect, the embodiment of the present application provides a fifth possible implementation manner of the second aspect, where the second calculating module is configured to, when calculating an average value according to power values of all the filtered signals to obtain a first power value of a narrowband interference signal, specifically is configured to:
Calculating a first power value of the narrowband interference signal by the following formula:
Where p represents a first power value of the narrowband interfering signal.
With reference to the second aspect, an embodiment of the present application provides a sixth possible implementation manner of the second aspect, where the fourth calculating module is configured to, when calculating the coefficient of the second filter according to the bandwidth of the narrowband wireless communication manner, the sampling frequency of the baseband signal, the second power value, and the frequency of the narrowband interference signal, specifically:
the normalized gain value of the coefficients of the second filter is calculated by the following formula:
Wherein G represents a normalized gain value of the coefficient of the second filter; g B=10-1/20;f0 denotes a bandwidth of the narrowband wireless communication scheme; fs represents the sampling frequency of the baseband signal;
the attenuation depth factor of the second filter is calculated by the following formula:
Wherein r represents the attenuation depth factor of the second filter; Representing the second power value;
The z-variation transfer function H 1 (z) of the second filter is calculated by the following formula:
wherein j represents a complex unit; f represents the frequency of the narrowband interference signal;
the coefficients of the second filter are obtained by the following formula:
Where d 1、d2、c1、c2 is the coefficient of the second filter.
In a third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory in communication via the bus when the electronic device is running, the machine-readable instructions when executed by the processor performing the steps of any one of the possible implementations of the first aspect.
In a fourth aspect, embodiments of the present application also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the possible implementations of the first aspect described above.
The embodiment of the application provides a method, a device, electronic equipment and a storage medium for suppressing a narrow-band interference signal, wherein a baseband signal with a specified length is intercepted from received baseband signals formed by aliasing of a broadband signal and the narrow-band interference signal to serve as a signal to be detected; segmenting the signal to be detected to obtain segmented signals of a preset number of segments; wherein the length of each segment of segmented signal is a preset length; calculating coefficients of the first filter according to the sampling frequency, the preset length, the preset number and the frequency of the narrowband interference signals of the baseband signals to obtain the first filter; for each segment of segmented signal, filtering the segmented signal through a first filter to filter broadband signals in the segmented signal and obtain a filtered signal after the segmented signal is filtered; calculating the power value of the filtering signal according to the signal at the target sampling point in the filtering signal and the coefficient of the first filter so as to calculate the average value according to the power values of all the filtering signals and obtain the first power value of the narrow-band interference signal; calculating the difference value between the first power value and the target power value to obtain a second power value of the narrowband interference signal to be suppressed; the target power value is a power value after the preset narrow-band interference signal is restrained; calculating coefficients of a second filter according to the bandwidth of the narrowband wireless communication mode, the sampling frequency of the baseband signal, the second power value and the frequency of the narrowband interference signal to obtain the second filter; the narrowband interference signals are received through a narrowband wireless communication mode; transmitting the baseband signal to a second filter, and suppressing the power of the narrowband interference signal in the baseband signal through the second filter so as to suppress the first power value of the narrowband interference signal in the baseband signal to a target power value, thereby obtaining a signal after narrowband interference suppression. In this embodiment, only the target power value after the narrowband interference signal is suppressed needs to be preset, and by suppressing the power value of the narrowband interference signal in the baseband signal to the target power value, the wideband signal in the baseband signal remains unchanged, which is beneficial to furthest retaining the original baseband signal, does not affect the baseband signal after the narrowband interference signal is suppressed, and is beneficial to improving the communication performance of the receiving device.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a flowchart of a method for suppressing a narrowband interference signal according to an embodiment of the present application;
fig. 2 is a schematic diagram of a spectrum of a broadband wireless communication mode and a spectrum of a narrowband wireless communication mode according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a suppression device for narrowband interference signals according to an embodiment of the present application;
Fig. 4 shows a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It is considered that when there is spectrum sharing between the broadband wireless transmission scheme and the narrowband wireless communication scheme and the spectrum of the narrowband wireless communication scheme is completely within the spectrum range of the broadband wireless communication scheme, the receiving device receives the narrowband signal of the narrowband wireless communication scheme at the same time when receiving the broadband signal by the broadband wireless transmission scheme, that is, the signal received by the receiving device is an aliasing of the broadband signal and the narrowband signal, and for the receiving device, the received narrowband signal belongs to an interference signal. When the narrowband interference signal exceeds a certain strength, the communication performance (e.g., signal reception quality, reception speed, etc.) of the receiving apparatus is affected. Based on this, the embodiments of the present application provide a method, an apparatus, an electronic device, and a storage medium for suppressing a narrowband interference signal, so as to suppress a received narrowband interference signal transmitted by a narrowband wireless communication mode, in the case that spectrum sharing exists between the wideband wireless transmission mode and the narrowband wireless communication mode, thereby improving communication performance of a receiving device. The following is a description of examples.
Embodiment one:
For the sake of understanding the present embodiment, first, a method for suppressing a narrowband interference signal disclosed in the present embodiment of the present application is described in detail, and the method is applied to a receiving device. Fig. 1 shows a flowchart of a method for suppressing a narrowband interference signal according to an embodiment of the present application, as shown in fig. 1, including the following steps S101 to S108:
s101: and intercepting a baseband signal with a specified length from the received baseband signal which is formed by aliasing of the broadband signal and the narrowband interference signal as a signal to be detected.
In this embodiment, fig. 2 shows a schematic diagram of a spectrum of a broadband wireless communication system and a spectrum of a narrowband wireless communication system according to an embodiment of the present application, and as shown in fig. 2, the spectrum of the narrowband wireless communication system is in a spectrum range of the broadband wireless communication system, that is, there is spectrum sharing between the narrowband wireless communication system and the broadband wireless communication system. The bandwidth refers to the length of the spectrum of the wireless communication system, and thus, the narrowband wireless communication system refers to a wireless communication system in which the bandwidth is smaller than a certain threshold (or the spectrum length is shorter than a certain threshold); the broadband wireless communication method refers to a wireless communication method in which a bandwidth is greater than a certain threshold (or a spectrum length is greater than a certain threshold).
The receiving device in this scheme refers to a device for receiving a wireless communication signal in a wireless transmission process using a broadband wireless communication scheme. Therefore, the wireless communication signal received by the receiving device is transmitted in the spectrum interval range corresponding to the broadband wireless communication system. Since the spectrum corresponding to the broadband wireless communication scheme and the spectrum corresponding to the narrowband wireless communication scheme have a problem of spectrum sharing, the receiving device can receive the wireless communication signal (i.e., narrowband signal) transmitted by the narrowband wireless communication scheme as well as the wireless communication signal (i.e., wideband signal) transmitted by the broadband wireless communication scheme. That is, the signal received by the receiving apparatus is actually an aliased signal formed by aliasing of a wideband signal and a narrowband signal.
In this embodiment, the narrowband interference signal in the aliasing signal received by the receiving device is suppressed, so that the communication performance of the receiving device can be improved.
In suppressing the narrowband interference signal, first, after receiving an aliasing signal formed by aliasing a wideband signal and a narrowband signal, the receiving device converts the aliasing signal into a baseband signal by performing analog-to-digital conversion on the aliasing signal because the aliasing signal belongs to an analog signal. Wherein, the baseband signal belongs to the digital signal and also belongs to the sampling point signal. Since the baseband signal is a signal obtained by mixing a wideband signal and a narrowband interference signal, the sampling frequencies of the baseband signal, the wideband signal and the narrowband interference signal are the same, and the number of sampling points is the same.
Then, a baseband signal with a specified length is cut out from the baseband signal as a signal to be detected, wherein the specified length is smaller than the total length of the baseband signal. The baseband signal may be a signal within one hour, and the signal to be detected may be a signal within 10 minutes thereof, for example.
In one possible implementation, when performing step S101, it may be specifically performed according to the following steps S1011-S1012:
s1011: and calculating the appointed length of the baseband signal to be intercepted based on the preset quantity and the preset length.
S1012: and intercepting the baseband signal according to the specified length to obtain the baseband signal with the specified length as a signal to be detected.
In this embodiment, parameters are initialized first, and the parameters include: a preset number, a preset length, a frequency of the narrowband interference signal, and a bandwidth of the narrowband wireless communication mode. The preset number refers to the number of segments when the signal to be detected is segmented; the preset length refers to the length of each segmented signal when the signal to be detected is segmented, and simultaneously represents the number of sampling points in each segmented signal. The frequency of the narrowband interfering signal and the bandwidth of the narrowband wireless communication scheme are known.
When step S1011 is performed, the specified length is obtained by calculating the product of the preset number and the preset length.
When step S1012 is executed, starting from the first sampling point signal in the baseband signal, the baseband signal is intercepted according to the specified length, and a baseband signal with the specified length is obtained as the signal to be detected. That is, the signal to be detected is a segment of the baseband signal.
S102: segmenting the signal to be detected to obtain segmented signals of a preset number of segments; wherein the length of each segment of the segmented signal is a preset length.
In one possible implementation manner, when performing step S102, it may specifically be: and carrying out average segmentation on the signal to be detected based on the preset quantity and/or the preset length to obtain segmented signals of the preset quantity of segments.
In this embodiment, the baseband signal may be represented by s (N), where N is the sampling point of the baseband signal, 1. Ltoreq.n.ltoreq.NxL. N is a preset number, L is a preset length, and NxL is a specified length.
The segmented signals after segmentation are: s m (N), m is not less than 1 and not more than N, L (m-1) +1 is not less than N and not more than Lxm. Wherein m is an index value of each segment of segmented signal; s m (n) is the mth segment signal.
S103: and calculating the coefficient of the first filter according to the sampling frequency, the preset length, the preset number and the frequency of the narrowband interference signal of the baseband signal to obtain the first filter.
In one possible implementation manner, when performing step S103, it may specifically be:
The bin index value k is calculated by the following formula:
Wherein L represents a preset length of the segmented signal; f represents the frequency of the narrowband interference signal; fs represents the sampling frequency of the baseband signal;
The transfer function H 1 (z) of the z-transform of the first filter is calculated by the following formula:
wherein j represents a complex unit; n represents a preset number of segmented signals;
The coefficients of the first filter are calculated by the following formula:
where a 1 denotes the denominator of the coefficients of the first filter and b 1 denotes the numerator of the coefficients of the first filter.
In this embodiment, the first filter is a second order filter.
S104: and for each segment of segmented signal, filtering the segmented signal through a first filter to filter broadband signals in the segmented signal, and obtaining a filtered signal after filtering the segmented signal.
In this embodiment, each segment of the segmented signal is also formed by aliasing of the segmented narrowband interference signal and the wideband signal, so that each segment of the segmented signal is filtered by the first filter, and after the wideband signal in each segment of the segmented signal is removed, each obtained segment of the filtered signal only contains the narrowband interference signal.
In this embodiment, the filtered signal after filtering each segment of the segmented signal may be represented by the following formula:
wherein y m (n) is a filtered signal obtained after the m-th segment of the segmented signal is filtered.
S105: and calculating the power value of the filtered signal according to the signal at the target sampling point in the filtered signal and the coefficient of the first filter so as to calculate the average value according to the power values of all the filtered signals and obtain the first power value of the narrowband interference signal.
In one possible implementation, when performing step S105 to calculate the power value of the filtered signal according to the signal at the target sampling point in the filtered signal and the coefficient of the first filter, the power value of each filtered signal may be calculated by the following formula:
Wherein m represents the sequence number of each section of filtering signal in the baseband signal; n represents the sequence number of each sampling point in the baseband signal; n represents a preset number; l represents a preset length, wherein the preset length is the number of sampling points in each segment of segmented signal; p m denotes the power value of the mth filtered signal; y m (n) represents a signal at a sampling point of sequence number n in the mth filtered signal; y m (n-1) represents the signal at the sampling point with the sequence number n-1 in the mth filtered signal; b 1 is the coefficient of the first filter; Representing the modulo calculation of y m(n)-b1∙ym (n-1).
In one possible implementation, when performing step S105 to calculate the average value according to the power values of all the filtered signals, and obtain the first power value of the narrowband interference signal, the first power value of the narrowband interference signal may be calculated by the following formula:
Where P represents a first power value of the narrowband interference signal, and the unit of P is dB (power unit).
S106: calculating the difference value between the first power value and the target power value to obtain a second power value of the narrowband interference signal to be suppressed; the target power value is a preset power value after the narrowband interference signal is restrained.
In this embodiment, the first power value is a power value before the narrowband interference signal is suppressed; the target power value is a power value obtained after the narrowband interference signal is suppressed, and is preset. The target power value is set by taking the condition that the narrowband interference signal has no influence on the demodulation and decoding of the broadband signal as a standard.
And calculating the difference between the first power value P and the target power value P 0 to obtain a second power value delta P. I.e. Δp=p-P 0. The second power value refers to a power value at which the narrowband interference signal needs to be suppressed.
For example, if the first power value P of the narrowband interference signal is-90 dB, the target power value P 0 is-120 dB, and the second power value Δp is 30 dB.
S107: calculating coefficients of a second filter according to the bandwidth of the narrowband wireless communication mode, the sampling frequency of the baseband signal, the second power value and the frequency of the narrowband interference signal to obtain the second filter; wherein, the narrowband interference signal is received by a narrowband wireless communication mode.
In one possible implementation, when step S107 is performed, the normalized gain value of the coefficients of the second filter may be calculated by the following formula:
Wherein G represents a normalized gain value of the coefficient of the second filter; g B=10-1/20;f0 denotes a bandwidth of the narrowband wireless communication scheme; fs represents the sampling frequency of the baseband signal;
the attenuation depth factor of the second filter is calculated by the following formula:
Wherein r represents the attenuation depth factor of the second filter; Representing a second power value;
The z-variation transfer function H 1 (z) of the second filter is calculated by the following formula:
wherein j represents a complex unit; f represents the frequency of the narrowband interference signal;
the coefficients of the second filter are obtained by the following formula:
Where d 1、d2、c1、c2 is the coefficient of the second filter.
S108: transmitting the baseband signal to a second filter, and suppressing the power of the narrowband interference signal in the baseband signal through the second filter so as to suppress the first power value of the narrowband interference signal in the baseband signal to a target power value, thereby obtaining a signal after narrowband interference suppression.
In this embodiment, after the second filter is obtained, the baseband signal is transmitted to the second filter, the power of the narrowband interference signal in the baseband signal is suppressed by the second filter, the first power value of the narrowband interference signal in the baseband signal is suppressed to the target power value, and the signal r 0 (n) after narrowband interference suppression is obtained as follows:
Where r (n) represents a baseband signal, and n is a sampling point of the baseband signal.
In this embodiment, suppressing the power of the narrowband interference signal in the baseband signal means reducing the power value of the narrowband interference signal in the baseband signal. For example, if the power value of the wideband signal is-80 dB, the first power value P of the narrowband interfering signal is-90 dB, the target power value P 0 is-120 dB, and the second power value Δp is 30 dB. Then, the power of the narrowband interference signal in the baseband signal is reduced from the first power value (-90 dB) to the target power value (-120 dB), that is, the second power value (30 dB) is reduced by the second filter. Therefore, the power value of the suppressed narrowband interference signal is smaller than that of the broadband signal, and the difference value of the power values is larger, and meanwhile, the target power value setting rule is that the narrowband interference signal has no influence on the demodulation and decoding of the broadband signal as a standard, so that the interference of the narrowband interference signal on the broadband signal can be reduced after the power value of the narrowband interference signal is reduced to the target power value.
In this embodiment, the signal after narrowband interference suppression is still a signal formed by aliasing a narrowband interference signal and a wideband signal, but the power value of the narrowband interference signal in the signal after narrowband interference suppression is reduced compared to the original baseband signal. Illustratively, the power value of the broadband signal in the original baseband signal is-80 dB, and the power value P of the narrowband interference signal is-90 dB; the power value of the broadband signal in the signal after the narrowband interference suppression is-80 dB, and the power value of the narrowband interference signal is-120 dB. Therefore, the original baseband signal can be reserved to the maximum extent, the baseband signal after the narrowband interference signal is restrained is not affected, and the communication performance of the receiving equipment is greatly improved.
Embodiment two:
based on the same technical concept, the present application further provides a device for suppressing a narrowband interference signal, and fig. 3 shows a schematic structural diagram of the device for suppressing a narrowband interference signal provided by the embodiment of the present application, as shown in fig. 3, where the device includes:
The intercepting module 301 is configured to intercept a baseband signal with a specified length from received baseband signals that are formed by aliasing of a wideband signal and a narrowband interference signal, as a signal to be detected;
the segmentation module 302 is configured to segment the signal to be detected to obtain segmented signals with a preset number of segments; the length of each segment of the segmented signal is a preset length;
A first calculating module 303, configured to calculate coefficients of a first filter according to the sampling frequency of the baseband signal, the preset length, the preset number, and the frequency of the narrowband interference signal, so as to obtain the first filter;
The filtering module 304 is configured to filter, for each segment of the segmented signal, the segmented signal through the first filter, so as to filter a wideband signal in the segmented signal, and obtain a filtered signal after filtering the segmented signal;
A second calculation module 305, configured to calculate a power value of the filtered signal according to the signal at the target sampling point in the filtered signal and the coefficient of the first filter, so as to calculate an average value according to the power values of all the filtered signals, and obtain a first power value of the narrowband interference signal;
A third calculation module 306, configured to calculate a difference between the first power value and the target power value, to obtain a second power value that needs to be suppressed for the narrowband interference signal; the target power value is a power value after a preset narrow-band interference signal is restrained;
A fourth calculation module 307, configured to calculate a coefficient of a second filter according to a bandwidth of a narrowband wireless communication manner, a sampling frequency of the baseband signal, the second power value, and a frequency of the narrowband interference signal, so as to obtain the second filter; wherein the narrowband interference signal is received by the narrowband wireless communication mode;
And the suppression module 308 is configured to transmit the baseband signal to the second filter, and suppress, by using the second filter, the power of the narrowband interference signal in the baseband signal, so as to suppress the first power value of the narrowband interference signal in the baseband signal to the target power value, thereby obtaining a signal after narrowband interference suppression.
Optionally, the intercepting module 301 is configured to, when intercepting a baseband signal with a specified length from a received baseband signal that is formed by aliasing of a wideband signal and a narrowband interference signal, specifically:
calculating the appointed length of the baseband signal to be intercepted based on the preset quantity and the preset length which are preset;
And intercepting the baseband signal according to the specified length to obtain the baseband signal with the specified length as the signal to be detected.
Optionally, the segmentation module 302 is configured to, when configured to segment the signal to be detected to obtain a segmented signal with a preset number of segments, specifically:
And carrying out average segmentation on the signal to be detected based on the preset quantity and/or the preset length to obtain segmented signals of the preset quantity of segments.
Optionally, the first calculating module 303 is configured to calculate the coefficient of the first filter according to the sampling frequency of the baseband signal, the preset length, the preset number, and the frequency of the narrowband interference signal, where the first calculating module is specifically configured to:
The bin index value k is calculated by the following formula:
Wherein L represents the preset length of the segment signal; f represents the frequency of the narrowband interference signal; fs represents the sampling frequency of the baseband signal;
The transfer function H 1 (z) of the z-transform of the first filter is calculated by the following formula:
Wherein j represents a complex unit; n represents the preset number of the segment signals;
The coefficients of the first filter are calculated by the following formula:
Where a 1 represents the denominator of the coefficients of the first filter and b 1 represents the numerator of the coefficients of the first filter.
Optionally, the target sampling point includes the last two sampling points in the filtered signal; the second calculation module 305 is specifically configured to, when calculating the power value of the filtered signal according to the signal at the target sampling point in the filtered signal and the coefficient of the first filter:
The power value of each filtered signal is calculated by the following formula:
Wherein m represents the sequence number of each section of filtering signal in the baseband signal; n represents the sequence number of each sampling point in the baseband signal; n represents the preset quantity; l represents the preset length, wherein the preset length is the number of sampling points in each segment of the segmented signal; p m denotes the power value of the mth filtered signal; y m (n) represents a signal at a sampling point of sequence number n in the mth filtered signal; y m (n-1) represents the signal at the sampling point with the sequence number n-1 in the mth filtered signal; b 1 is the coefficient of the first filter.
Optionally, the second calculating module 305 is configured to, when calculating the average value according to the power values of all the filtered signals, obtain the first power value of the narrowband interference signal, specifically:
Calculating a first power value of the narrowband interference signal by the following formula:
Where p represents a first power value of the narrowband interfering signal.
Optionally, the fourth calculating module 307 is configured to calculate the coefficient of the second filter according to the bandwidth of the narrowband wireless communication mode, the sampling frequency of the baseband signal, the second power value, and the frequency of the narrowband interference signal, where the fourth calculating module is specifically configured to:
the normalized gain value of the coefficients of the second filter is calculated by the following formula:
Wherein G represents a normalized gain value of the coefficient of the second filter; g B=10-1/20;f0 denotes a bandwidth of the narrowband wireless communication scheme; fs represents the sampling frequency of the baseband signal;
the attenuation depth factor of the second filter is calculated by the following formula:
Wherein r represents the attenuation depth factor of the second filter; Representing the second power value; /(I)
The z-variation transfer function H 1 (z) of the second filter is calculated by the following formula:
wherein j represents a complex unit; f represents the frequency of the narrowband interference signal;
the coefficients of the second filter are obtained by the following formula:
Where d 1、d2、c1、c2 is the coefficient of the second filter.
Embodiment III:
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application, including: the electronic device comprises a processor 401, a memory 402 and a bus 403, wherein the memory 402 stores machine readable instructions executable by the processor 401, and when the electronic device runs the information processing method, the processor 401 communicates with the memory 402 through the bus 403, and the processor 401 executes the machine readable instructions to execute the method steps described in the first embodiment.
Embodiment four:
the fourth embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor performs the method steps described in the first embodiment.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus, electronic device and computer readable storage medium described above may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, and for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above examples are only specific embodiments of the present application, and are not intended to limit the scope of the present application, but it should be understood by those skilled in the art that the present application is not limited thereto, and that the present application is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for suppressing a narrowband interfering signal, comprising:
intercepting a baseband signal with a specified length from received baseband signals formed by aliasing of broadband signals and narrowband interference signals as a signal to be detected;
segmenting the signal to be detected to obtain segmented signals of a preset number of segments; the length of each segment of the segmented signal is a preset length;
calculating coefficients of a first filter according to the sampling frequency of the baseband signal, the preset length, the preset quantity and the frequency of the narrowband interference signal to obtain the first filter;
for each segment of the segmented signal, filtering the segmented signal through the first filter to filter broadband signals in the segmented signal, so as to obtain a filtered signal after the segmented signal is filtered;
Calculating the power value of the filtering signal according to the signal at the target sampling point in the filtering signal and the coefficient of the first filter so as to calculate the average value according to the power values of all the filtering signals and obtain the first power value of the narrowband interference signal;
Calculating the difference value between the first power value and the target power value to obtain a second power value of which the narrowband interference signal needs to be suppressed; the target power value is a power value after a preset narrow-band interference signal is restrained;
Calculating coefficients of a second filter according to the bandwidth of the narrowband wireless communication mode, the sampling frequency of the baseband signal, the second power value and the frequency of the narrowband interference signal to obtain the second filter; wherein the narrowband interference signal is received by the narrowband wireless communication mode;
Transmitting the baseband signal to the second filter, and suppressing the power of the narrowband interference signal in the baseband signal by the second filter so as to suppress the first power value of the narrowband interference signal in the baseband signal to the target power value, thereby obtaining a signal after narrowband interference suppression.
2. The method according to claim 1, wherein the step of extracting a baseband signal with a specified length from the received baseband signal, which is formed by aliasing a wideband signal and a narrowband interference signal, as the signal to be detected includes:
calculating the appointed length of the baseband signal to be intercepted based on the preset quantity and the preset length which are preset;
And intercepting the baseband signal according to the specified length to obtain the baseband signal with the specified length as the signal to be detected.
3. The method according to claim 1 or 2, wherein the segmenting the signal to be detected to obtain a segmented signal of a preset number of segments comprises:
And carrying out average segmentation on the signal to be detected based on the preset quantity and/or the preset length to obtain segmented signals of the preset quantity of segments.
4. The method of claim 1, wherein calculating coefficients of the first filter based on the sampling frequency of the baseband signal, the preset length, and the preset number comprises:
The bin index value k is calculated by the following formula:
Wherein L represents the preset length of the segment signal; f represents the frequency of the narrowband interference signal; fs represents the sampling frequency of the baseband signal;
The transfer function H 1 (z) of the z-transform of the first filter is calculated by the following formula:
Wherein j represents a complex unit; n represents the preset number of the segment signals;
The coefficients of the first filter are calculated by the following formula:
Where a 1 represents the denominator of the coefficients of the first filter and b 1 represents the numerator of the coefficients of the first filter.
5. The method of claim 1, wherein the target sample point comprises a last two sample points in the filtered signal; the calculating the power value of the filtered signal according to the signal at the target sampling point in the filtered signal and the coefficient of the first filter comprises the following steps:
The power value of each filtered signal is calculated by the following formula:
Wherein m represents the sequence number of each section of filtering signal in the baseband signal; n represents the sequence number of each sampling point in the baseband signal; n represents the preset quantity; l represents the preset length, wherein the preset length is the number of sampling points in each segment of the segmented signal; p m denotes the power value of the mth filtered signal; y m (n) represents a signal at a sampling point of sequence number n in the mth filtered signal; y m (n-1) represents the signal at the sampling point with the sequence number n-1 in the mth filtered signal; b 1 is the coefficient of the first filter.
6. The method of claim 5, wherein calculating the average value based on the power values of all the filtered signals to obtain the first power value of the narrowband interfering signal comprises:
Calculating a first power value of the narrowband interference signal by the following formula:
Where p represents a first power value of the narrowband interfering signal.
7. The method of claim 1, wherein calculating the coefficients of the second filter based on the bandwidth of the narrowband wireless communication mode, the sampling frequency of the baseband signal, the second power value, and the frequency of the narrowband interfering signal comprises:
the normalized gain value of the coefficients of the second filter is calculated by the following formula:
Wherein G represents a normalized gain value of the coefficient of the second filter; g B=10-1/20;f0 denotes a bandwidth of the narrowband wireless communication scheme; fs represents the sampling frequency of the baseband signal;
the attenuation depth factor of the second filter is calculated by the following formula:
Wherein r represents the attenuation depth factor of the second filter; Representing the second power value;
The z-variation transfer function H 1 (z) of the second filter is calculated by the following formula:
wherein j represents a complex unit; f represents the frequency of the narrowband interference signal;
the coefficients of the second filter are obtained by the following formula:
Where d 1、d2、c1、c2 is the coefficient of the second filter.
8. A suppression device for narrowband interference signals, comprising:
The intercepting module is used for intercepting a baseband signal with a specified length from received baseband signals formed by aliasing of broadband signals and narrowband interference signals as a signal to be detected;
the segmentation module is used for segmenting the signal to be detected to obtain segmented signals with a preset number of segments; the length of each segment of the segmented signal is a preset length;
the first calculation module is used for calculating coefficients of a first filter according to the sampling frequency of the baseband signal, the preset length, the preset quantity and the frequency of the narrowband interference signal to obtain the first filter;
the filtering module is used for filtering the segmented signals through the first filter aiming at each segment of the segmented signals so as to filter broadband signals in the segmented signals and obtain filtered signals after the segmented signals are filtered;
The second calculation module is used for calculating the power value of the filtering signal according to the signal at the target sampling point in the filtering signal and the coefficient of the first filter so as to calculate the average value according to the power values of all the filtering signals and obtain the first power value of the narrowband interference signal;
The third calculation module is used for calculating the difference value between the first power value and the target power value to obtain a second power value of which the narrowband interference signal needs to be suppressed; the target power value is a power value after a preset narrow-band interference signal is restrained;
A fourth calculation module, configured to calculate a coefficient of a second filter according to a bandwidth of a narrowband wireless communication mode, a sampling frequency of the baseband signal, the second power value, and a frequency of the narrowband interference signal, so as to obtain the second filter; wherein the narrowband interference signal is received by the narrowband wireless communication mode;
And the suppression module is used for transmitting the baseband signal to the second filter, and suppressing the power of the narrowband interference signal in the baseband signal through the second filter so as to suppress the first power value of the narrowband interference signal in the baseband signal to the target power value, thereby obtaining a signal subjected to narrowband interference suppression.
9. An electronic device, comprising: a processor, a memory and a bus, said memory storing machine-readable instructions executable by said processor, said processor and said memory communicating over the bus when the electronic device is running, said machine-readable instructions when executed by said processor performing the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any of claims 1 to 7.
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