WO2019080567A1

WO2019080567A1 - Multiband digital predistortion processing method, device and system

Info

Publication number: WO2019080567A1
Application number: PCT/CN2018/097583
Authority: WO
Inventors: 刁穗东; 吴卓智; 姜成玉; 雷文明
Original assignee: 京信通信系统（中国）有限公司; 京信通信系统（广州）有限公司; 京信通信技术(广州)有限公司; 天津京信通信系统有限公司
Priority date: 2017-10-27
Filing date: 2018-07-27
Publication date: 2019-05-02
Also published as: CN107707495B; CN107707495A

Abstract

The present invention relates to a multiband digital predistortion processing method and device; by means of acquiring a non-linear distortion indicator for a feedback signal of each band and carrying out iterative non-linear cancellation on the feedback signal of each band, it is possible to effectively improve the linearization effect of multiband digital predistortion.

Description

Method, device and system for multi-band digital predistortion processing

Technical field

The present invention relates to the field of signal processing technologies for wireless communications, and in particular, to a method, apparatus and system for multi-band digital predistortion processing.

Background technique

In modern wireless communication systems, higher power transmitters are the most energy-intensive part of the entire wireless communication system. To save energy consumption of the entire system, it is the best choice for each equipment manufacturer to improve the energy efficiency of the transmitter. Increasing the static working point can improve the energy efficiency ratio of the transmitter, but it leads to the nonlinear distortion of the transmitted signal due to entering the nonlinear range of the power amplifier. At present, the most common method for solving nonlinear distortion is digital predistortion.

With the increasing congestion of wireless spectrum, wireless communication operators need wireless communication devices to work in multiple frequency bands simultaneously to ensure a high wireless communication rate, while using multiple sets of devices in different frequency bands will lead to an increase in cost and power consumption. It is an inevitable choice to reduce the cost and power consumption by sharing the same power amplifier and digital processing circuit in different working frequency bands of the same device, but the existing multi-band digital pre-distortion processing method has a problem of relatively poor linearization effect.

Summary of the invention

Based on this, it is necessary to provide a multi-band digital pre-distortion processing method and apparatus for the problem of poor linearization effect.

A method for multi-band digital pre-distortion processing, comprising the following steps:

Obtaining a nonlinear distortion index of a feedback signal of a power amplifier corresponding to each frequency band;

When the discrete feature of the nonlinear distortion indicator is greater than a preset decision threshold, starting from a frequency band corresponding to the highest priority nonlinear distortion index, one frequency band is sequentially selected as the current frequency band according to the priority of the nonlinear distortion index, according to The digital pre-distortion coefficient of the current frequency band updates the feedback signal of each frequency band whose priority of the nonlinear distortion index is less than the priority of the nonlinear distortion index of the current frequency band;

Generating a digital pre-distortion coefficient of the next frequency band according to the updated feedback signal of the next frequency band and the input signal of the next frequency band of the power amplifier, and according to the digital pre-distortion coefficient of the next frequency band The input signal of the frequency band is subjected to digital predistortion processing; wherein the next frequency band is a frequency band whose priority of the nonlinear distortion index is second only to the priority of the nonlinear distortion index of the current frequency band.

A multi-band digital pre-distortion processing device, comprising:

Predistortion processing unit, DAC, combiner, splitter, ADC and data acquisition unit;

The predistortion processing unit is coupled to the combiner via a DAC, the combiner being coupled to an input of a power amplifier, the splitter being coupled to an output of the power amplifier and coupled to the data acquisition unit via an ADC, The data acquisition unit is connected to the predistortion processing unit;

The splitter branches and outputs the feedback signal of each frequency band output by the power amplifier to the ADC;

The ADC performs analog-to-digital variation on the feedback signals of the respective frequency bands and outputs the signals to the data acquisition unit;

The data acquisition unit synchronously collects input signals of various frequency bands of the power amplifier, synchronously collects feedback signals of respective frequency bands of the power amplifier, and outputs the input signals and feedback signals to the predistortion processing unit;

The predistortion processing unit is configured to perform a method of multi-band digital pre-distortion processing, and output a digital pre-distortion processed input signal of each frequency band to the DAC;

The DAC performs digital-to-analog conversion on the digital pre-distortion-processed input signals of each frequency band, and then inputs the signals to the power amplifier through the combiner.

A multi-band digital predistortion processing system comprising:

An obtaining module, configured to obtain a nonlinear distortion indicator of a feedback signal of a power amplifier corresponding to each frequency band;

And an update module, configured to: when the discrete feature of the nonlinear distortion indicator is greater than a preset decision threshold, select a frequency band according to the priority of the nonlinear distortion index from the frequency band corresponding to the nonlinear distortion indicator with the highest priority As the current frequency band, according to the digital pre-distortion coefficient of the current frequency band, the feedback signal of each frequency band whose priority of the nonlinear distortion index is less than the priority of the nonlinear distortion index of the current frequency band is updated;

a predistortion processing module, configured to generate a digital pre-distortion coefficient of the next frequency band according to the updated feedback signal of the next frequency band and the input signal of the next frequency band of the power amplifier, and according to the digital pre-determination of the next frequency band The distortion coefficient performs digital predistortion processing on the input signal of the next frequency band; wherein the next frequency band is a frequency band whose priority of the nonlinear distortion index is second only to the priority of the nonlinear distortion index of the current frequency band.

A computer readable storage medium having stored thereon a computer program for performing the multi-band digital pre-distortion processing method when executed by a processor.

A computer apparatus comprising a memory, a processor, and a computer program stored on the memory and operative on the processor, the processor implementing the multi-band digital pre-distortion processing when the program is executed.

The above multi-band digital pre-distortion processing method, device and system, and computer readable storage medium and computer device obtain nonlinear distortion index of feedback signals of respective frequency bands, and perform iterative nonlinear elimination of feedback signals of respective frequency bands It can effectively improve the linearization effect of multi-band digital pre-distortion.

DRAWINGS

1 is a flow chart of a method for multi-band digital pre-distortion processing of an embodiment;

2 is a schematic structural diagram of an apparatus for multi-band digital predistortion processing according to an embodiment;

FIG. 3 is a schematic structural diagram of a system for multi-band digital predistortion processing according to an embodiment.

Detailed ways

The technical solution of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the present invention provides a method for multi-band digital pre-distortion processing, which may include the following steps:

S1, acquiring a nonlinear distortion indicator of a feedback signal of a power amplifier corresponding to each frequency band;

In the embodiment of the present invention, the output signal y1 _i of the power amplifier is used as a feedback signal of the power amplifier to perform digital predistortion processing on the input signal x _i of the power amplifier. In one embodiment, the input signal x _{i of} each frequency band of the power amplifier can be synchronously collected, and the feedback signal y1 _{i of} each frequency band of the power amplifier is synchronously acquired, and then the input signal x _{i of} each frequency band and the feedback signal y1 _{i of the} corresponding frequency band are respectively respectively. Calculate the nonlinear distortion index K _i of the feedback signal of the corresponding frequency band. For example, assuming a total of three bands, can be synchronized capture three-band input signals x _1, x ₂ and x _3, at the same time, can be synchronized capture three-band feedback signal y1 _1, y1 _2, and y1 _3; then, The nonlinear distortion index K _{1 of the} band 1 can be calculated according to x ₁ and y1 ₁ , the nonlinear distortion index K ₂ of the band 2 is calculated according to x ₂ and y1 ₂ , and the nonlinear distortion index of the band 3 is calculated according to x ₃ and y1 ₃ K ₃ .

Further, in the calculation of the nonlinear distortion index K _i, the power amplifier can be acquired each frequency band input signal x _i and a corresponding feedback signal y1 _i; the respective band feedback signal corresponding to the relative y1 _i x _i for the input signal The orthogonal component is used to separate the linear component and the nonlinear distortion component of the feedback signal corresponding to each frequency band; the nonlinear distortion index K _{i of} each frequency band is obtained according to the linear component and the nonlinear distortion component of each frequency band. In particular, for the i-th input frequency band signals x _i and i _i-band feedback signal Y1, delay may be first feedback signal Y1 _i, so that the feedback signal delay an input signal Y1 _i x _i are aligned, the delay The adjusted feedback signal is denoted as y2 _i ; then the orthogonalization of y2 _i to x _i is performed to obtain y3 _i . In one embodiment, the orthogonalization of y2 _i to x _i can be performed as follows:

Y3 _{i is} the linear component of the feedback signal. Where H represents a conjugate transpose operation. Then, the nonlinear distortion component Δy _i can be calculated according to the following formula:

Δy _i = y2 _{i -} y3 _i .

Then, the nonlinear distortion index K _{i of} the i-th frequency band is the power ratio of the nonlinear component Δy _i and the linear component y3 _i .

S2, when the discrete feature of the nonlinear distortion indicator is greater than a preset threshold, starting from a frequency band corresponding to the highest priority nonlinear distortion index, selecting a frequency band as the current frequency band according to the priority of the nonlinear distortion index priority And updating, according to the digital pre-distortion coefficient of the current frequency band, a feedback signal of each frequency band whose priority of the nonlinear distortion index is less than the priority of the nonlinear distortion index of the current frequency band;

In this step, the feedback control signal of the power amplifier may be generated according to the digital pre-distortion coefficient of the current frequency band; and the feedback of the frequency band with the priority of the nonlinear distortion index being less than the priority of the nonlinear distortion index of the current frequency band The signal is subtracted from the feedback control signal to obtain an update result of the frequency band in which the priority of the nonlinear distortion indicator is less than the priority of the nonlinear distortion indicator of the current frequency band.

In this step, according to the discrete characteristics of the nonlinear distortion index K _i of each frequency band, it is determined whether the digital pre-distortion coefficient calculation and the pre-distortion processing are sequentially performed for each frequency band, or the digital pre-distortion coefficient is simultaneously performed for each frequency band. The calculation is then performed simultaneously with predistortion processing. In this way, multi-band pre-distortion effects can be optimized more efficiently. The discrete feature may adopt the mean value of the nonlinear distortion index of each frequency band K _i , or may use the difference between the maximum value and the mean value of K _i . Preferably, the standard deviation of K _i may also be used. In this way, the multi-band pre-distortion effect can be further optimized. In one embodiment, the value of the decision threshold may be taken as 0.5, that is, when the discrete feature is greater than 0.5, digital predistortion processing is sequentially performed on each frequency band; otherwise, digital predistortion processing is simultaneously performed on each frequency band. The decision threshold can also take other values. It has been experimentally proved that an optimum predistortion effect can be achieved when the value is 0.5.

In one embodiment, the nonlinear distortion may be determined according to the size K _i of priority indicators each frequency band, the frequency band higher priority K _i greater nonlinear distortion index, i.e., a non-linear distortion index descending K _i The order selects one frequency band in turn as the current frequency band and performs subsequent operations. Further, for the first frequency band with the largest nonlinear distortion index, the digital pre-distortion coefficient of the first frequency band may be calculated according to the input signal of the first frequency band with the largest nonlinear distortion index and the feedback signal of the first frequency band; The digital predistortion coefficient of the first frequency band performs digital predistortion processing on the input signal of the first frequency band, and uses the first frequency band as a current frequency band, and returns a digital predistortion coefficient to a nonlinear distortion index according to the current frequency band. The step of updating the feedback signal of each frequency band smaller than the current frequency band. After obtaining the digital predistortion coefficient of the first frequency band, the nonlinear distortion index can be used as the current frequency band only after the second frequency band of the first frequency band, and subsequent operations are performed; then, the nonlinear distortion index can be second only to the second The third frequency band of the second frequency band is used as the current frequency band, and subsequent operations are performed; and so on, until all frequency bands are digitally predistorted. It should be noted that the foregoing “non-linear distortion index is second only to the second frequency band of the first frequency band” means that the value of the nonlinear distortion index is only smaller than the first frequency band, and is greater than the frequency band of each frequency band except the first frequency band. The meaning of "second only" in other parts of the present invention is similar to this and will not be described again.

In this way, the frequency band with the most severe nonlinear distortion can be obtained first, the digital pre-distortion coefficient of the frequency band is calculated, and the nonlinear distortion effect of the frequency band is cleared in other frequency bands, thereby optimizing the multi-band pre-distortion effect. In order to facilitate the selection of the current frequency band according to the order of the nonlinear distortion index K _i from the largest to the smallest, all the frequency bands can be sorted according to the nonlinear distortion index K _i , and then the sorted frequency bands are numbered, and finally according to the sorting number from small to small The large order determines the current frequency band in turn.

In another embodiment, the nonlinear distortion index K _{i of} each frequency band may be multiplied by the weight P _{i of the} corresponding frequency band to obtain a weighting result corresponding to each frequency band; The order is sorted from the largest to the smallest, thereby obtaining the priority of the nonlinear distortion index K _i of each frequency band. The larger the weighted result, the higher the priority of the frequency band corresponding to the nonlinear distortion index K _i . In order to facilitate the selection of the current frequency band according to the weighted nonlinear distortion index from the largest to the smallest, the frequency bands may be arranged in descending order according to the weighted nonlinear distortion indicators. That is, before the respective frequency bands are sorted in descending order according to the magnitude of the nonlinear distortion index of each frequency band, the nonlinear distortion indexes of the respective frequency bands are weighted according to the weights corresponding to the respective frequency bands; the weighted nonlinear distortion index is used as Nonlinear distortion indicators for each frequency band.

Preferably, the method of first sorting the weighted nonlinear distortion indicators and then selecting the frequency band may be adopted. Wherein, the weight P _i can be set according to the relative position of each frequency band in the power amplifier design passband, and can be an empirical value or an expression. Specifically, the relative positions of each frequency band in the power amplifier design passband are sorted, and the frequency bands are sorted from the low frequency band to the high frequency band, and the number q _i of the sorted frequency bands is 1 to N, and N is the total number of frequency bands. The band weight P _{i of} each frequency band can be obtained as follows:

P _i =(q _i -1)*(Nq _i )+1.

After the sorting is completed, the number of the corresponding frequency band in descending order can be recorded as j, which is called the jth frequency band. When determining the current frequency band according to the number, the frequency band corresponding to each number is determined as the current frequency band in the order of number from small to large, that is, the frequency band numbered 1 is determined as the current frequency band, and the frequency band numbered 2 is determined as the current frequency band. Frequency band, and so on.

S3. Generate a digital pre-distortion coefficient of the next frequency band according to the updated feedback signal of the next frequency band and the input signal of the next frequency band of the power amplifier, and according to the digital pre-distortion coefficient of the next frequency band. The input signal of the next frequency band is subjected to digital predistortion processing; wherein the next frequency band is a frequency band whose nonlinear distortion index is second only to the current frequency band.

Further, after generating the digital pre-distortion coefficient of the next frequency band, the next frequency band may also be used as the current frequency band; and then returning the feedback according to the digital pre-distortion coefficient of the current frequency band to each frequency band whose nonlinear distortion index is smaller than the current frequency band. The step of updating the signal. In this way, digital predistortion processing is finally realized through multiple rounds of iteration.

As a specific embodiment, a multi-band power amplifier model may be established in advance. For example, the following multi-band power amplifier model may be established: y _j =g(x _j , c _j ), where x _j is an input signal of the frequency band numbered after the sequence number j , y _j is the feedback signal of the frequency band numbered j, and c _j is the digital pre-distortion coefficient of the frequency band numbered j. In practical applications, after calculating c ₁ by using the input signal x ₁ and the feedback signal y _{1 of} the j=1 band, the x _{1 is} replaced by x ₂ , and the feedback control signal of the j=2 band is obtained.

Then obtain the updated feedback signal of the j=2 band of the first round of iteration

In the same way, the feedback signals y' ₃ , y ' ₄ , ..., y' _N , N of the other frequency bands in the first round of iteration are obtained. Then, the digital pre-distortion coefficient calculation and the pre-distortion processing can be performed on the j=2 frequency band, specifically, the digital pre-distortion coefficient calculation and the digital pre-distortion processing in the j=1th band are completed, and the first round of iterations is obtained. After the feedback signal of the frequency band, c _{2 is} calculated by the power amplifier input signal x ₂ and the feedback signal y′ _{2 of} the j=2 frequency band, and then the feedback signals of other frequency bands deducting j=1 and j=2 are eliminated by the j=th= The 2-band feedback control signal obtains the updated feedback signal y′′ ₃ , y′′ ₄ , . . . , y′′ _{N of the} second iteration, and so on, until the digital pre-distortion coefficients of all frequency bands are obtained. Then, The digital pre-distortion processing can be performed on the input signals of the respective frequency bands according to the digital pre-distortion coefficient.

In another embodiment, when the discrete feature is less than or equal to the decision threshold, the digital pre-distortion coefficients of the respective frequency bands may be simultaneously calculated; and the digital pre-distortion coefficients are simultaneously digitally pre-calculated for the input signals of the respective frequency bands. Distortion processing.

After the digital pre-distortion processing, the pre-distorted input signal of each frequency band can be input to a DAC (Digital to Analog Converter), and then the input power amplifier is combined. Wherein, the combined road can be performed in the combiner, and the combined road includes frequency-recovering the signals of the respective frequency bands to the designated frequency band, and then combining and outputting.

As shown in FIG. 2, the present invention further provides an apparatus for multi-band digital pre-distortion processing, which may include:

Predistortion processing unit, DAC, combiner, splitter, ADC (Analog to Digital Converter) and data acquisition unit;

The apparatus for multi-band digital pre-distortion processing of this embodiment may perform the method of multi-band digital pre-distortion processing in any of the above embodiments, and details are not described herein again.

Further, the acquisition unit can perform trigger storage on the input signals of the respective frequency bands before outputting to the DAC, and start the storage of the input signals of the respective frequency bands when the first synchronization trigger signal (Trigger1) is detected, and at the first time The storage of the input signals for the respective frequency bands is stopped after the length T1.

Further, the data acquisition unit may perform trigger storage on the feedback signals of the respective frequency bands output by the ADC, and start storing the feedback signals of the respective frequency bands when the second synchronization trigger signal (Trigger2) is detected, and in the second time length T2 The storage of the feedback signals for each frequency band is then stopped.

Wherein, the shunt is performed in the splitter, including shunting the multi-band signal to the power amplifier, and frequency-shifting the signal to each frequency band, and then filtering each frequency band signal.

The signal Trigger1 and the signal Trigger2 can be triggered by the third synchronization trigger signal (Trigger3), and there is a delay ΔT between the signal Trigger1 and the signal Trigger2. Preferably, ΔT is less than 1 us. Multi-band acquisition requires synchronization, and the more synchronized, the better, 1us is the boundary that the algorithm can tolerate. Among them, both T1 and T2 satisfy 30us or more. Preferably, T1 = T2 = 30us. The value is 30us, which can meet the needs of the calculation coefficient without affecting the speed.

The multi-band digital pre-distortion processing method and device can effectively improve the linearization of multi-band digital pre-distortion by acquiring the nonlinear distortion index of the feedback signal of each frequency band and performing iterative nonlinear elimination of the feedback signals of each frequency band. effect.

As shown in FIG. 3, the present invention further provides a system for multi-band digital pre-distortion processing, which may include:

The obtaining module 10 is configured to obtain a nonlinear distortion indicator of a feedback signal of the power amplifier corresponding to each frequency band;

The updating module 20 is configured to: when the discrete feature of the nonlinear distortion indicator is greater than a preset threshold, select one of the priority ranges of the nonlinear distortion indicator according to the priority of the nonlinear distortion indicator The frequency band is used as the current frequency band, and the feedback signal of each frequency band whose priority of the nonlinear distortion index is less than the priority of the nonlinear distortion index of the current frequency band is updated according to the digital predistortion coefficient of the current frequency band;

The pre-distortion processing module 30 is configured to generate a digital pre-distortion coefficient of the next frequency band according to the updated feedback signal of the next frequency band and the input signal of the next frequency band of the power amplifier, and according to the number of the next frequency band The pre-distortion coefficient performs digital pre-distortion processing on the input signal of the next frequency band; wherein the next frequency band is a frequency band whose priority of the nonlinear distortion index is second only to the priority of the nonlinear distortion index of the current frequency band.

The multi-band digital pre-distortion processing system of the present invention is in one-to-one correspondence with the multi-band digital pre-distortion processing method of the present invention, and the technical features and beneficial effects described in the embodiments of the multi-band digital pre-distortion processing method are applicable. In the embodiment of the system for multi-band digital predistortion processing, it is hereby declared.

Further, the present invention also provides a computer readable storage medium having stored thereon a computer program for performing the multi-band digital pre-distortion processing method when executed by a processor. The method for multi-band digital pre-distortion processing implemented by the program stored in the computer readable storage medium of the present invention is the same as the embodiment of the method for multi-band digital pre-distortion processing described above, and details are not described herein again.

Further, the present invention also provides a computer device comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, the processor implementing the multi-band digital pre-implementation when the program is executed The method of distortion processing. The method for multi-band digital pre-distortion processing implemented by the processor of the computer device of the present invention is the same as the embodiment of the method for multi-band digital pre-distortion processing described above, and details are not described herein again.

The logic and/or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer readable medium, Used in conjunction with, or in conjunction with, an instruction execution system, apparatus, or device (eg, a computer-based system, a system including a processor, or other system that can fetch instructions and execute instructions from an instruction execution system, apparatus, or device) Or use with equipment. For the purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with such an instruction execution system, apparatus, or device.

More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM). In addition, the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.

It should be understood that portions of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A method for multi-band digital pre-distortion processing, comprising the steps of:

Obtaining a nonlinear distortion index of a feedback signal of a power amplifier corresponding to each frequency band;

When the discrete feature of the nonlinear distortion indicator is greater than a preset decision threshold, starting from a frequency band corresponding to the highest priority nonlinear distortion index, one frequency band is sequentially selected as the current frequency band according to the priority of the nonlinear distortion index, according to The digital pre-distortion coefficient of the current frequency band updates the feedback signal of each frequency band whose priority of the nonlinear distortion index is less than the priority of the nonlinear distortion index of the current frequency band;

Generating a digital pre-distortion coefficient of the next frequency band according to the updated feedback signal of the next frequency band and the input signal of the next frequency band of the power amplifier, and according to the digital pre-distortion coefficient of the next frequency band The input signal of the frequency band is subjected to digital predistortion processing; wherein the next frequency band is a frequency band whose priority of the nonlinear distortion index is second only to the priority of the nonlinear distortion index of the current frequency band.
The multi-band digital pre-distortion processing method according to claim 1, wherein the step of acquiring a nonlinear distortion index of a feedback signal of each frequency band of the power amplifier comprises:

Acquiring an input signal and a corresponding feedback signal of each frequency band of the power amplifier;

The feedback signals of the respective frequency bands are orthogonalized with respect to the corresponding input signals, and the linear components and the nonlinear distortion components of the feedback signals corresponding to the respective frequency bands are separated.

The nonlinear distortion index of each frequency band is obtained according to the linear component and the nonlinear distortion component of each frequency band.
The multi-band digital pre-distortion processing method according to claim 1, wherein the priority of the digital distortion coefficient according to the current frequency band is less than the priority of the nonlinear distortion index of the current frequency band. The steps of updating the feedback signals of each frequency band include:

Generating a feedback control signal of the power amplifier according to a digital predistortion coefficient of a current frequency band;

And subtracting the feedback control signal from a feedback signal of a frequency band whose priority of the nonlinear distortion indicator is smaller than a priority of the nonlinear distortion index of the current frequency band, and obtaining a priority of the nonlinear distortion indicator is smaller than the current frequency band The nonlinear distortion indicator prioritizes the update of the frequency band.
The method of claim 1, wherein the method further comprises:

Multiplying the nonlinear distortion indicators of the respective frequency bands by the weights of the corresponding frequency bands respectively, and obtaining weighted results corresponding to the respective frequency bands;

The weighting results corresponding to the respective frequency bands are sorted in descending order, thereby obtaining the priority of the nonlinear distortion index of each frequency band.
The method of claim 4, wherein the method further comprises:

Calculate the weight P i corresponding to each frequency band according to the following method:

P i =(q i -1)*(Nq i )+1;

Where P i is the weight corresponding to the ith band, q i is an integer between 1 and N, and N is the total number of bands.
A device for multi-band digital pre-distortion processing, comprising:

Predistortion processing unit, DAC, combiner, splitter, ADC and data acquisition unit;

The predistortion processing unit is coupled to the combiner via a DAC, the combiner being coupled to an input of a power amplifier, the splitter being coupled to an output of the power amplifier and coupled to the data acquisition unit via an ADC, The data acquisition unit is connected to the predistortion processing unit;

The splitter branches and outputs the feedback signal of each frequency band output by the power amplifier to the ADC;

The ADC performs analog-to-digital variation on the feedback signals of the respective frequency bands and outputs the signals to the data acquisition unit;

The data acquisition unit synchronously collects input signals of various frequency bands of the power amplifier, synchronously collects feedback signals of respective frequency bands of the power amplifier, and outputs the input signals and feedback signals to the predistortion processing unit;

The predistortion processing unit is configured to perform the multi-band digital pre-distortion processing method according to any one of claims 1 to 5, and output the digital pre-distortion processed input signal of each frequency band to the DAC;

The DAC performs digital-to-analog conversion on the digital pre-distortion-processed input signals of each frequency band, and then inputs the signals to the power amplifier through the combiner.
The apparatus for multi-band digital pre-distortion processing according to claim 6, wherein the data acquisition unit performs trigger storage on an input signal of each frequency band before output to the DAC, when the first synchronization trigger signal is detected Initiating storage of input signals for each frequency band and stopping storage of input signals for respective frequency bands after a first length of time; and/or

The data acquisition unit performs trigger storage on the feedback signals of the respective frequency bands output by the ADC, starts the storage of the feedback signals of the respective frequency bands when the second synchronization trigger signal is detected, and stops the frequency bands after the second time length The storage of feedback signals.
A multi-band digital pre-distortion processing system, comprising:

An obtaining module, configured to obtain a nonlinear distortion indicator of a feedback signal of a power amplifier corresponding to each frequency band;

And an update module, configured to: when the discrete feature of the nonlinear distortion indicator is greater than a preset decision threshold, select a frequency band according to the priority of the nonlinear distortion index from the frequency band corresponding to the nonlinear distortion indicator with the highest priority As the current frequency band, according to the digital pre-distortion coefficient of the current frequency band, the feedback signal of each frequency band whose priority of the nonlinear distortion index is less than the priority of the nonlinear distortion index of the current frequency band is updated;

a predistortion processing module, configured to generate a digital pre-distortion coefficient of the next frequency band according to the updated feedback signal of the next frequency band and the input signal of the next frequency band of the power amplifier, and according to the digital pre-determination of the next frequency band The distortion coefficient performs digital predistortion processing on the input signal of the next frequency band; wherein the next frequency band is a frequency band whose priority of the nonlinear distortion index is second only to the priority of the nonlinear distortion index of the current frequency band.
A computer readable storage medium having stored thereon a computer program, wherein the program is executed by a processor to implement the method of multi-band digital pre-distortion processing according to any one of claims 1 to 5.
A computer device comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor executes the program to implement any one of claims 1 to 5 Multi-band digital pre-distortion processing method.