CN106603108A - Transceiver and work method thereof - Google Patents

Abstract

The invention provides a transceiver and a working method. The transceiver includes a zero-IF transmission path and a zero-IF reception path, and: a feedback control link for obtaining a transmission signal of the zero-IF transmission path, and generating a signal according to the transmission signal The feedback signal is used to calibrate the zero-IF transmission path according to the feedback signal; the calibration device is used for online calibration of the zero-IF transmission path, the zero-IF reception path and the feedback control link. Through the implementation of the present invention, the transceiver obtains the transmission signal of the transmission path through the feedback control link, and de-calibrates the transmission path according to the transmission signal, and the calibration device also realizes online calibration of all paths in the transceiver, so that The transceiver can be calibrated in real time according to the operating conditions of the equipment, which improves the working performance of the zero-IF transceiver and solves the problem of poor working performance caused by offline calibration of the existing zero-IF transceiver.

Description

Transceiver and working method

technical field

The invention relates to the field of transceivers of communication systems, in particular to a transceiver and a working method.

Background technique

In the field of communication in recent years, due to the development of devices, more and more zero-IF technology has been widely used and gradually matured; the biggest advantage of transceivers using zero-IF technology is that the IF filter circuit is omitted, and the IF mixing It simplifies the channel, reduces the cost of the channel, and reduces the size of the single board. These advantages meet the needs of miniaturization and low cost of today's transceivers, especially communication base stations; therefore, the transceiver of zero-IF technology The letter machine has been widely concerned and used.

However, the carrier and image frequency of the zero-IF transceiver will fall into the signal band and affect the performance of the transceiver. The IF scheme can move these components out of the useful signal band through frequency planning, and satisfy system applications through simple off-line calibration and filtering. However, the biggest disadvantage of the offline calibration scheme is that the calibration parameters cannot adapt to temperature changes. The calibration values written in the offline table at room temperature will greatly deteriorate as the temperature changes. For the zero-IF architecture, due to carrier leakage and sideband suppression. The spurious components all fall into the useful signal band, and the off-line calibration is used, and the working performance is poor.

Therefore, how to provide a zero-IF transceiver that can provide working performance is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The invention provides a transceiver and a working method to solve the problem of poor working performance caused by off-line calibration of the existing zero-IF transceiver.

The invention provides a transceiver, including a zero-IF transmission path and a zero-IF reception path, and: a feedback control link for obtaining a transmission signal of a zero-IF transmission path, generating a feedback signal according to the transmission signal, and calibrating according to the feedback signal The zero-IF transmission path; the calibration device is used for online calibration of the zero-IF transmission path, the zero-IF reception path and the feedback control link.

Further, the feedback control link is used to determine the transmission power of the zero-IF transmission path according to the transmission signal, generate a feedback signal according to the transmission power, and assist in calibrating the zero-IF transmission path according to the feedback signal.

Further, the transceiver includes multiple zero-IF transmission paths, and the feedback control link is used to calibrate each zero-IF transmission path through time division multiplexing.

Further, the calibration device is also used for off-line calibration of the zero-IF transmission path, the zero-IF reception path and the feedback control link.

Further, the calibration device is specifically used to turn off the power amplifier device of the zero-IF transmission path during initialization; use the internal calibration source of the zero-IF transmission path to perform offline calibration of the transmission local oscillator leakage of the zero-IF transmission path; construct and use the zero-IF transmission The filter coefficients on the channel simulate the amplitude and phase imbalance of the transmitting branch, and perform off-line calibration of the transmitting image frequency on the zero-IF transmitting channel; use the internal calibration source of the feedback control link to perform feedback off-line calibration on the feedback control link; component and use the filter coefficient on the feedback control link to simulate the amplitude and phase imbalance of the feedback shunt, and perform feedback mirror frequency off-line calibration on the feedback control link; Receive off-line calibration of the channel; construct and use the filter coefficients on the zero-IF receiving channel to simulate the amplitude and phase imbalance of the receiving branch, and perform offline calibration of the receiving image frequency on the zero-IF receiving channel.

Further, the calibration device is used to turn on the power amplifier device of the zero-IF transmission channel during normal operation; control the feedback control link to obtain the transmission signal of the zero-IF transmission channel, and perform digital pre-distortion detection, standing wave detection and power detection according to the transmission signal ;Use business data to perform on-line calibration of the receiving image frequency on the zero-IF receiving channel; after a preset time, control the feedback control link to stop acquiring the transmitting signal of the zero-IF transmitting channel, and use business data to transmit the zero-IF transmitting channel for local oscillator leakage On-line calibration and on-line calibration of emission mirror frequency, using business data to perform online calibration of feedback mirror frequency on the feedback control link.

Further, the preset time includes controlling a calibration switching period or a sending and receiving switching time slot.

The invention provides a working method of a transceiver. The transceiver includes a zero-IF transmission path, a zero-IF reception path, a feedback control link and a calibration device. The working method includes: the feedback control link obtains the transmission of the zero-IF transmission path signal, generating a feedback signal according to the transmission signal, and calibrating the zero-IF transmission path according to the feedback signal; the calibration device performs online calibration on the zero-IF transmission path, the zero-IF reception path and the feedback control link.

Further, the feedback control link acquires the transmission signal of the zero-IF transmission path, and the calibration of the zero-IF transmission path according to the transmission signal includes: the feedback control link determines the transmission power of the zero-IF transmission path according to the transmission signal, and generates a feedback signal according to the transmission power. The feedback signal aids in the calibration of the zero-IF transmit path.

Further, it also includes: the transceiver includes multiple zero-IF transmission paths, and the feedback control link calibrates each zero-IF transmission path through time-division multiplexing.

Further, it also includes: the calibration device performs off-line calibration on the zero-IF transmission path, the zero-IF reception path and the feedback control link.

Further, the offline calibration of the zero-IF transmission path, the zero-IF reception path and the feedback control link by the calibration device includes: when initializing, turning off the power amplifier device of the zero-IF transmission path; Off-line calibration of transmit local oscillator leakage on the intermediate frequency transmit path; construct and use the filter coefficients on the zero-IF transmit path to simulate the amplitude and phase imbalance of the transmit branch, and perform offline calibration of the transmit image frequency on the zero-IF transmit path; use feedback control The internal calibration source of the link, feedback off-line calibration of the feedback control link; build and use the filter coefficients on the feedback control link, simulate the amplitude and phase imbalance of the feedback branch, and perform feedback mirror frequency on the feedback control link Offline calibration; use the internal calibration source of the zero-IF receiving path to perform offline calibration on the zero-IF receiving path; construct and use the filter coefficients on the zero-IF receiving path to simulate the amplitude and phase imbalance of the receiving branch, and adjust the zero-IF The receiving path performs off-line calibration of the receiving image frequency.

Further, the online calibration of the zero-IF transmission path, the zero-IF reception path and the feedback control link by the calibration device includes: in normal operation, the power amplifier device of the zero-IF transmission path is turned on; the feedback control link is controlled to obtain the zero-IF transmission path Transmit signal, perform digital pre-distortion detection, standing wave detection and power detection according to the transmitted signal; use business data to perform online calibration of receiving image frequency on the zero-IF receiving channel; after a preset time, control the feedback control link to stop acquiring zero-IF transmission For the transmission signal of the channel, use the business data to perform online calibration of the transmission local oscillator leakage and the online calibration of the transmission mirror frequency for the zero-IF transmission channel, and use the business data to perform online calibration of the feedback mirror frequency for the feedback control link.

Further, the preset time includes controlling a calibration switching period or a sending and receiving switching time slot.

Beneficial effects of the present invention:

The invention provides a transceiver, the transceiver includes a feedback control link and a calibration device, the feedback control link obtains the transmission signal of the transmission path, and de-calibrates the transmission path according to the transmission signal, and at the same time, the calibration device also realizes The online calibration of all channels in the transceiver enables the transceiver to be calibrated in real time according to the operation of the equipment, which improves the working performance and solves the problem of poor working performance caused by the offline calibration of the existing zero-IF transceiver.

Description of drawings

FIG. 1 is a schematic structural diagram of a transceiver provided by a first embodiment of the present invention;

Fig. 2 is the flowchart of the working method of the transceiver provided by the second embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a transceiver provided by a third embodiment of the present invention;

FIG. 4 is a flow chart of the overall calibration of the transceiver in the third embodiment of the present invention;

FIG. 5 is a flow chart of receiving channel calibration in the third embodiment of the present invention;

FIG. 6 is a flow chart of transmitting path calibration in the third embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a transceiver provided by a fourth embodiment of the present invention.

detailed description

The present invention will be further explained by means of specific embodiments in combination with the accompanying drawings.

First embodiment:

Fig. 1 is a schematic structural diagram of the transceiver provided by the first embodiment of the present invention. As can be seen from Fig. 1, in this embodiment, the transceiver 1 provided by the present invention includes: a zero-IF transmission path 11 and a zero-IF reception path 12 ,as well as:

The feedback control link 13 is used to obtain the transmission signal of the zero-IF transmission path 11, generate a feedback signal according to the transmission signal, and calibrate the zero-IF transmission path according to the feedback signal;

The calibration device 14 is used for online calibration of the zero-IF transmission path, zero-IF reception path and feedback control link, so as to realize real-time calibration of the transceiver.

In some embodiments, the feedback control link 13 in the above embodiment calibrates the zero-IF transmission path according to the feedback signal, including direct control calibration and auxiliary calibration, which can be realized by setting a separate control module (such as setting a CPU, etc.) The output of the DAC module and/or the low-pass filter module in the intermediate frequency transmission path 11 is directly controlled and calibrated, and the transmission power in the feedback signal can also be compared with the transmission work that is desired to be achieved, and a comparison result is output, and then the comparison The result is sent to the DAC module and/or low-pass filter module in the zero-IF transmission path 11, and the DAC module and/or low-pass filter module adjusts the output power according to the comparison result, so as to complete the assistance of the feedback control link 13 to the zero-IF transmission path 11 Calibration and more.

In some embodiments, the feedback control link 13 in the above embodiments is used to determine the transmission power of the zero-IF transmission path according to the transmission signal, generate a feedback signal according to the transmission power, and assist in calibrating the zero-IF transmission path according to the feedback signal.

In some embodiments, the transceiver 1 in the above embodiments includes multiple zero-IF transmission paths 12, and the feedback control link 13 is used to calibrate each zero-IF transmission path 12 in a time-division multiplexing manner.

In some embodiments, the calibration device 14 in the above embodiments is also used for off-line calibration of the zero-IF transmission path, the zero-IF reception path and the feedback control link.

In some embodiments, the calibration device 14 in the above embodiments is specifically used for:

When initializing, close the power amplifier device of the zero-IF transmission path;

Use the internal calibration source of the zero-IF transmission path to perform off-line calibration of the transmission local oscillator leakage for the zero-IF transmission path;

Construct and use the filter coefficients on the zero-IF transmission path to simulate the amplitude and phase imbalance of the transmission branch, and perform offline calibration of the transmission image frequency on the zero-IF transmission path;

Feedback off-line calibration of the feedback control link by using the internal calibration source of the feedback control link;

Components and use the filter coefficients on the feedback control link to simulate the amplitude and phase imbalance of the feedback branch, and perform feedback mirror frequency off-line calibration on the feedback control link;

Use the internal calibration source of the zero-IF receiving path to perform off-line calibration for the zero-IF receiving path;

Construct and use the filter coefficients on the zero-IF receiving path to simulate the amplitude and phase imbalance of the receiving branch, and perform off-line calibration of the receiving image frequency on the zero-IF receiving path.

In some embodiments, the calibration device 14 in the above embodiments is specifically used for:

In normal operation, open the power amplifier device of the zero-IF transmission path;

Control the feedback control link to obtain the transmission signal of the zero-IF transmission channel, and perform digital pre-distortion detection, standing wave detection and power detection according to the transmission signal;

Use business data to perform on-line calibration of the receiving image frequency on the zero-IF receiving channel;

After the preset time, control the feedback control link to stop acquiring the transmission signal of the zero-IF transmission channel, use the business data to perform online calibration of the transmission local oscillator leakage and online calibration of the transmission mirror frequency on the zero-IF transmission channel, and use the business data to perform the online calibration of the feedback control chain Online calibration of the feedback image frequency.

In some embodiments, the preset time in the foregoing embodiments includes controlling a calibration switching period or a time slot for transmitting and receiving switching, which is mainly for a TDD (Time Division Duplexing, time division duplexing) system.

The offline calibration involved in the present invention refers to the calibration performed before the normal operation of the device when the device is initialized, and is mainly used to correct the error existing in the device itself; correspondingly, the online calibration refers to the calibration performed when the device is working normally , which is mainly used to correct errors caused by environmental factors such as temperature and power.

Second embodiment:

Fig. 2 is the flowchart of the working method of the transceiver provided by the second embodiment of the present invention, as can be seen from Fig. 2, in the present embodiment, the working method of the transceiver provided by the present invention comprises the following steps:

S201: The feedback control link acquires the transmission signal of the zero-IF transmission path, generates a feedback signal according to the transmission signal, and calibrates the zero-IF transmission path according to the feedback signal;

S202: The calibration device performs online calibration on the zero-IF transmission path, the zero-IF reception path, and the feedback control link.

In some embodiments, the feedback control link in the above embodiment obtains the transmission signal of the zero-IF transmission path, and calibrating the zero-IF transmission path according to the transmission signal includes: the feedback control link determines the transmission power of the zero-IF transmission path according to the transmission signal, A feedback signal is generated according to the transmit power, and the zero-IF transmit path is assisted in calibration according to the feedback signal.

In some embodiments, the transceiver in the above embodiments includes multiple zero-IF transmission paths, and its working method further includes: the feedback control link calibrates each zero-IF transmission path through time-division multiplexing.

In some embodiments, the working method in the above embodiments further includes: the calibration device performs offline calibration on the zero-IF transmission path, the zero-IF reception path, and the feedback control link.

In some embodiments, the offline calibration of the zero-IF transmission path, the zero-IF reception path, and the feedback control link by the calibration device in the above embodiments includes:

When initializing, close the power amplifier device of the zero-IF transmission path;

Use the internal calibration source of the zero-IF transmission path to perform off-line calibration of the transmission local oscillator leakage for the zero-IF transmission path;

Construct and use the filter coefficients on the zero-IF transmission path to simulate the amplitude and phase imbalance of the transmission branch, and perform offline calibration of the transmission image frequency on the zero-IF transmission path;

Feedback off-line calibration of the feedback control link by using the internal calibration source of the feedback control link;

Components and use the filter coefficients on the feedback control link to simulate the amplitude and phase imbalance of the feedback branch, and perform feedback mirror frequency off-line calibration on the feedback control link;

Use the internal calibration source of the zero-IF receiving path to perform off-line calibration for the zero-IF receiving path;

Construct and use the filter coefficients on the zero-IF receiving path to simulate the amplitude and phase imbalance of the receiving branch, and perform off-line calibration of the receiving image frequency on the zero-IF receiving path.

In some embodiments, the online calibration of the zero-IF transmission path, zero-IF reception path, and feedback control link by the calibration device in the above-mentioned embodiments includes:

In normal operation, open the power amplifier device of the zero-IF transmission path;

Control the feedback control link to obtain the transmission signal of the zero-IF transmission channel, and perform digital pre-distortion detection, standing wave detection and power detection according to the transmission signal;

Use business data to perform on-line calibration of the receiving image frequency on the zero-IF receiving channel;

After the preset time, control the feedback control link to stop acquiring the transmission signal of the zero-IF transmission channel, use the business data to perform online calibration of the transmission local oscillator leakage and online calibration of the transmission mirror frequency on the zero-IF transmission channel, and use the business data to perform the online calibration of the feedback control chain Online calibration of the feedback image frequency.

In some embodiments, the preset time in the above embodiments includes controlling a calibration switching period or a time slot for switching between sending and receiving.

The present invention will be further explained in combination with specific application scenarios.

Third embodiment:

This embodiment provides a transceiver with single reception and single transmission, as shown in Figure 3:

The hardware structure of the transceiver RRU (Remote Radio Unit, remote radio unit) includes an antenna 31 common to the receiving path and the transmitting path, a filter module 32, a low-noise amplifier module 331 belonging to the receiving path, a controllable gain amplifier module 341, a solution Tuning module 351, LPF (Low Pass Filter, low-pass filter) low-pass filter module 361 and ADC (Analog to digital converter, analog-to-digital converter) analog-to-digital conversion module 371, belonging to the power amplifier module 332 of the transmission path, controllable gain Amplifier module 342, modulation module 352, LPF low-pass filter module 362 and DAC (Digital to Analog converter, digital-to-analog converter) digital-to-analog converter module 372, a selection switch 333 with a coupling function belonging to the feedback control link, and a controllable gain amplifier Module 343, demodulation module 353, LPF low-pass filter module 363 and ADC analog-to-digital conversion module 373, and the main digital signal processing module 38 for service realization, also includes a phase-locked loop module and a local oscillator module not shown Wherein, controllable gain amplifier modules 341, 342 and 343 can be realized by time division multiplexing of a controllable gain amplifier, demodulation module 351, modulation module 352 and demodulation module 353 can also be realized by a modem, LPF low-pass filter The modules 361, 362 and 363 can be time-multiplexed by an LPF low-pass filter, and the ADC analog-to-digital conversion module 371, the DAC digital-to-analog conversion module 372 and the ADC analog-to-digital conversion module 373 can also be implemented by an AD/DA converter. In this embodiment, the functions of the calibration device are implemented by software, therefore, this embodiment does not show the corresponding modules.

Specifically, the schematic diagram of the zero-IF single-channel transceiver system consists of three parts: transmission, reception and feedback. The transmission link is completed by the DAC after digital-to-analog conversion, and then provided to the modulation module through low-pass filtering to complete the up-conversion, and then through the controllable gain. The amplifying module is used to adjust the transmission power, and finally the signal is amplified by the power amplifier and then filtered to the antenna port for transmission; after receiving the signal at the antenna port, the receiving link passes through the low-noise amplification and controllable gain amplification module for gain control and then sends it to the demodulator for further The frequency is down-converted and then filtered by a low-pass filter to perform analog-to-digital conversion to the ADC; the feedback link includes a controllable gain amplifier module and a demodulation and low-pass filter module, and the filtered signal is provided to the ADC for analog-to-digital conversion. In the next step, the feedback link is responsible for power detection, standing wave detection, and real-time calibration functions, and the channel switching module is used to switch between multiple transmission channels.

Functional description of each module of the transceiver provided by the present invention, compared with the traditional high-frequency and high-frequency architecture, the zero-IF architecture does not require a radio frequency filter module, an intermediate frequency amplification module and an intermediate frequency filter module. The filtering module is used for filtering in the receiving and transmitting frequency bands to suppress unwanted signals and improve the performance of the transceiver. The low-noise amplification module performs low-noise amplification on the received small signal. The controllable gain amplifying module completes the gain adjustment function of the receiver and the transmitter. The modulation and demodulation module uses a modulator to perform up-conversion conversion on the transmitter, and uses a demodulator to perform down-conversion conversion on the receiver and feedback. The phase-locked loop module is used to provide the local oscillator signal to the modulator and demodulator. The local oscillator module provides local oscillator signals to the modem module. The low-pass filter module filters the intermediate frequency signal before modulation and after demodulation. The AD/DA module completes the conversion from analog to digital and digital to analog. The power amplifier module amplifies the transmitted small signal to the rated output power. The coupling module in the selection switch completes the signal coupling, and the energy of the coupled transmission signal is provided to the feedback link for power detection to realize transmission power control and pre-distortion data collection functions. The selection module completes the multi-channel forward and reverse signal selection functions. The digital signal processing module completes digital signal calculation and digital processing functions.

The above is the description of the hardware architecture of the zero-IF transceiver system provided by this embodiment, and another key point is the realization of the automatic calibration function of the zero-IF transceiver and the solution for cooperating with the RRU system function.

The automatic calibration function includes the calibration of the transmit local oscillator and image frequency and the calibration of the receive/feedback DC offset and image frequency. Specifically, it can be divided into transmit local oscillator leakage offline calibration, transmit image frequency offline calibration, receive and feedback offline calibration, receive Off-line calibration with feedback image frequency, transmit local oscillator leakage, online calibration of transmit image frequency and receive and feedback image frequency.

Offline calibration uses the internal calibration source of the transceiver module to generate a single tone, frequency sweep or modulation signal to complete the calibration, and online calibration uses the business signal of the transceiver to ensure that the normal transceiver business is not affected while completing real-time calibration.

As shown in Figure 4, the overall calibration flowchart of the RRU system will not be described in detail, and now the detailed processes of receiving and transmitting calibration are described separately.

Since the receiving calibration function is not multiplexed with other channels, offline calibration can be completed and online calibration can be enabled when the RRU is initialized, as shown in Figure 5. The receiving calibration process will not be described in detail here. The coefficients are used to simulate the amplitude and phase imbalance of the IQ split to achieve the calibration of the image frequency of the receiving chain.

For the transmission calibration, since the real-time calibration process needs to occupy the feedback control link, the real-time calibration and the digital pre-distortion algorithm of the transmitter, power detection and standing wave detection functions are mutually exclusive, so it is necessary to perform software on the power-on process of the transceiver and the real-time calibration process. control.

Based on this, as shown in Figure 6, the transmission calibration process includes: first, the RRU is powered on and the transmission channel is enabled, and the internal calibration source is used to perform offline calibration. At this time, in order to protect the power amplifier, the power amplifier is turned off before the calibration starts, and then the feedback channel is sequentially Perform offline calibration with the transmit channel, and simulate the amplitude and phase imbalance of the IQ branch of the transmit link by constructing the LPF filter coefficients on the transmit link to achieve transmit sideband calibration. After the offline calibration is completed, the internal calibration source is turned off, and the transmitter normally sends business data while performing DPD (Digital Pre Distortion, digital pre-distortion) detection, standing wave detection, and power detection functions. At the same time, the timing is started, and DPD and standing wave are stopped after the specified time period is reached. Detection, power detection function, use the business data to start the online calibration function of the transmission and feedback link, and restore the functions of DPD, standing wave detection and power detection after the calibration is completed. For the TDD system, it is necessary to judge the switching time slot for sending and receiving, perform the receiving online calibration when the receiving work is enabled, and perform the transmitting online calibration when the transmitting work is enabled. In order to ensure the robustness of the calibration process, some error flags and countermeasures can be set.

Fourth embodiment:

This embodiment provides a transceiver with dual reception and dual transmission (2T2R), as shown in FIG. 7:

The 2T2R transceiver provided in this embodiment duplicates the receiving path and the transmitting path of the single-receiving and single-transmitting receiver shown in FIG. 3 , and uses a common feedback control link in a time-division multiplexing manner. The controllable gain amplifying module can be realized by an integrated scheme of an attenuator and an amplifier.

Power-on RRU start-up and calibration process includes: after power-on, firstly initialize the software and hardware of the single board, run the chip version loading after the optical port self-adaptation, perform chip initialization configuration with the power amplifier turned off, and complete the offline calibration of the downlink mirror frequency and sideband At this time, the power amplifier output coupling loop is required to be disconnected, so the electronic switch is turned to the ALL OFF state, and finally the uplink offline calibration is triggered. After the offline calibration is completed, the RRU performs power calibration and other processes, and the number of iterations of each calibration is set during the calibration process. , returns a success value upon completion. If an error occurs during the calibration process, the error code will be reported and the chip will be reset and re-calibrated, and the error will be reported for five consecutive times to stop working.

The online calibration process includes: setting the calibration cycle, the online calibration is that the control state of the electronic switch is switched from the FPGA (Field-Programmable Gate Array, Field Programmable Gate Array) to the manual control of the CPU, which is fixed as the service signal of the corresponding transmission channel, and the FPGA is switching When the electronic switch is in the manual state, the switching point is required to be within the interval between two complete switching cycles of the electronic switch, that is, to ensure the integrity of the electronic switching cycle. At the beginning of the calibration, the RRU needs to stop DPD and standing wave detection, stop power detection, and switch the electronic switch to the corresponding service signal channel. After the calibration is completed, the CPU enables the electronic switch to be in the FPGA automatic state, enables power detection, and enables DPD. And standing wave detection function. If an error message occurs during the calibration process, it is necessary to judge the error message, shield the information that does not affect the performance and use, give an alarm for the error message that does not affect the function if the performance is damaged, and give an alarm notification for the unavailable information. Write to the log.

In summary, through the implementation of the present invention, there are at least the following beneficial effects:

The invention provides a transceiver, the transceiver includes a feedback control link and a calibration device, the feedback control link obtains the transmission signal of the transmission path, and de-calibrates the transmission path according to the transmission signal, and at the same time, the calibration device also realizes The online calibration of all channels in the transceiver enables the transceiver to be calibrated in real time according to the operation of the equipment, which improves the working performance and solves the problem of poor working performance caused by the offline calibration of the existing zero-IF transceiver.

The above are only specific embodiments of the present invention, and do not limit the present invention in any form. Any simple modification, equivalent change, combination or modification made to the above embodiments according to the technical essence of the present invention still belong to this invention. The protection scope of the technical solution of the invention.

Claims (14)

1. A transceiver, characterized in that, comprises a zero-IF transmitting path and a zero-IF receiving path, and: A feedback control link, configured to obtain a transmission signal of the zero-IF transmission path, generate a feedback signal according to the transmission signal, and calibrate the zero-IF transmission path according to the feedback signal; A calibration device is used for online calibration of the zero-IF transmission path, the zero-IF reception path and the feedback control link. 2. The transceiver according to claim 1, wherein the feedback control link is used to determine the transmission power of the zero-IF transmission path according to the transmission signal, generate a feedback signal according to the transmission power, and generate a feedback signal according to the transmission signal. The feedback signal assists in calibrating the zero-IF transmission path. 3. The transceiver according to claim 1, wherein the transceiver comprises a plurality of zero-IF transmission paths, and the feedback control link is used to calibrate each zero-IF transmission path by time-division multiplexing path. 4. The transceiver according to any one of claims 1 to 3, wherein the calibration device is also used for the zero-IF transmission path, the zero-IF reception path and the feedback control link Perform offline calibration. 5. transceiver as claimed in claim 4, is characterized in that, described calibration device is specifically used for, when initializing, closes the power amplifier device of described zero-IF transmission path; Utilizes the internal calibration source of described zero-IF transmission path , performing off-line calibration of transmit local oscillator leakage on the zero-IF transmit path; constructing and using the filter coefficients on the zero-IF transmit path, simulating the amplitude and phase imbalance of the transmit branch, and performing calibration on the zero-IF transmit path Transmit image frequency off-line calibration; use the internal calibration source of the feedback control link to perform feedback off-line calibration on the feedback control link; and use the filter coefficients on the feedback control link to simulate the feedback shunt If the amplitude and phase are unbalanced, the feedback mirror frequency offline calibration is performed on the feedback control link; the internal calibration source of the zero-IF receiving channel is used to perform receiving offline calibration on the zero-IF receiving channel; the zero-IF receiving channel is constructed and used The filter coefficients on the intermediate frequency receiving path simulate the amplitude and phase imbalance of the receiving branch, and perform off-line calibration of the receiving image frequency on the zero intermediate frequency receiving path. 6. The transceiver according to claim 4, wherein the calibration device is used to open the power amplifier of the zero-IF transmission path during normal operation; control the feedback control link to obtain the zero-IF The transmission signal of the intermediate frequency transmission channel is used to perform digital predistortion detection, standing wave detection and power detection according to the transmission signal; use the service data to perform online calibration of the receiving mirror frequency on the zero intermediate frequency receiving channel; after a preset time, control the The feedback control link stops acquiring the transmission signal of the zero-IF transmission channel, uses the service data to perform online calibration of the transmission local oscillator leakage and online calibration of the transmission image frequency on the zero-IF transmission channel, and uses the service data to perform online calibration of the transmission mirror frequency. The above feedback control link is used to perform online calibration of the feedback image frequency. 7. The transceiver according to claim 6, wherein the preset time includes a control calibration switching cycle or a time slot for switching between sending and receiving. 8. A working method of a transceiver, characterized in that, said transceiver comprises a zero-IF transmitting path, a zero-IF receiving path, a feedback control link and a calibration device, and said working method comprises: The feedback control link acquires a transmission signal of the zero-IF transmission path, generates a feedback signal according to the transmission signal, and calibrates the zero-IF transmission path according to the feedback signal; The calibration device performs online calibration on the zero-IF transmitting path, the zero-IF receiving path and the feedback control link. 9. The working method according to claim 8, wherein the feedback control link obtains the transmission signal of the zero-IF transmission path, and calibrating the zero-IF transmission path according to the transmission signal comprises: the feedback The control link determines the transmit power of the zero-IF transmit path according to the transmit signal, generates a feedback signal according to the transmit power, and assists in calibrating the zero-IF transmit path according to the feedback signal. 10. The working method according to claim 8, further comprising: the transceiver includes a plurality of zero-IF transmission paths, and the feedback control link calibrates each zero-IF transmission path by time-division multiplexing path. 11. The working method according to any one of claims 8 to 10, further comprising: the calibration device performs a process on the zero-IF transmission path, the zero-IF reception path, and the feedback control link Offline calibration. 12. The working method according to claim 11, wherein the offline calibration of the zero-IF transmission path, the zero-IF reception path, and the feedback control link by the calibration device comprises: when initializing, Turn off the power amplifier device of the zero-IF transmission path; use the internal calibration source of the zero-IF transmission path to perform off-line calibration of the transmission local oscillator leakage on the zero-IF transmission path; construct and use the filtering on the zero-IF transmission path Transmitter coefficients, simulate the amplitude and phase imbalance of the transmission branch, and perform offline calibration of the transmission image frequency on the zero-IF transmission channel; use the internal calibration source of the feedback control link to perform feedback offline on the feedback control link Calibration; components and utilize the filter coefficients on the feedback control link to simulate the magnitude and phase imbalance of the feedback shunt, and perform feedback mirror frequency off-line calibration on the feedback control link; utilize the zero-IF receiving path An internal calibration source, performing offline calibration on the zero-IF receiving path; constructing and using the filter coefficients on the zero-IF receiving path, simulating the amplitude and phase imbalance of the receiving branch, and performing calibration on the zero-IF receiving path Receive image frequency off-line calibration. 13. The working method according to claim 11, wherein said calibration device performs online calibration on said zero-IF transmission path, said zero-IF reception path and said feedback control link comprising: during normal operation , turning on the power amplifier device of the zero-IF transmission path; controlling the feedback control link to obtain the transmission signal of the zero-IF transmission path, and performing digital predistortion detection, standing wave detection and power detection according to the transmission signal; using the service The data is used to perform online calibration of the receiving image frequency on the zero-IF receiving channel; after a preset time, control the feedback control link to stop acquiring the transmission signal of the zero-IF transmitting channel, and use the business data to On-line calibration of transmit local oscillator leakage and online calibration of transmit mirror frequency is performed on the transmit path, and online calibration of feedback mirror frequency is performed on the feedback control link by using the service data. 14. The working method according to claim 13, wherein the preset time includes controlling a calibration switching period or a time slot for transmitting and receiving switching.