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CN109617842A - A digital predistortion system and method for an all-digital multi-beam transmitter - Google Patents

A digital predistortion system and method for an all-digital multi-beam transmitter Download PDF

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CN109617842A
CN109617842A CN201910139332.0A CN201910139332A CN109617842A CN 109617842 A CN109617842 A CN 109617842A CN 201910139332 A CN201910139332 A CN 201910139332A CN 109617842 A CN109617842 A CN 109617842A
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order
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digital predistortion
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CN109617842B (en
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余超
景建新
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Southeast University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)

Abstract

本发明公开了一种全数字多波束发射机的数字预失真系统及其方法，所述数字预失真系统包括全数字波束成形网络、数字预失真模块、系数提取模块、功率放大器、发射天线阵、反馈回路接收天线和信号分解模块。本发明还基于该系统提供一种全数字多波束发射机的数字预失真方法。本发明结合了全数字波束成形技术和数字预失真技术，解决了全数字多波束场景下波束合成和非线性问题，能够以较低的代价产生目标波束并实现线性化。

The invention discloses a digital predistortion system and a method for an all-digital multi-beam transmitter. The digital predistortion system comprises an all-digital beamforming network, a digital predistortion module, a coefficient extraction module, a power amplifier, a transmitting antenna array, The feedback loop receives the antenna and the signal decomposition module. The invention also provides a digital predistortion method for an all-digital multi-beam transmitter based on the system. The invention combines the all-digital beam forming technology and the digital predistortion technology, solves the beam synthesis and nonlinear problems in the all-digital multi-beam scene, and can generate the target beam and realize linearization at a lower cost.

Description

A kind of digital pre-distortion system and its method of digital Multibeam Transmitter
Technical field
The invention belongs to digital pre-distortion technology more particularly to a kind of pre- mistakes of number for digital Multibeam Transmitter True system and method.
Background technique
Multi-user scene is a major issue of following 5th third-generation mobile communication (5G) system, is based on extensive multi input The digital multiple-beam system of multi output technology has received widespread attention, and forms high-gain by placing a large amount of antenna element Wave beam carry out improve data transfer rate, and since beam forming is realized in numeric field, thus may be implemented very flexible Beam scanning.As traditional communication system, in order to guarantee that the working efficiency of system, radio-frequency power amplifier must work In nonlinear area, serious inband distortion and out-of-band distortion can be brought.
In recent years, digital pre-distortion technology relies on the advantages that its at low cost and high-precision to obtain significant progress, quilt It is widely used in the linearisation of communication system.However, conventional digital pre-distortion technology will in digital multiple-beam system By significant challenge.Because beam forming is realized in numeric field, the intersection of each wave beam of the non-linear introducing of power amplifier Signal will lead to wave beam and can not be formed, while also be difficult to isolate digital pre- for extracting corresponding to the output signal of each wave beam Distortion parameter.Therefore, it is infeasible for traditional digital pre-distortion technology being directly applied to digital multiple-beam system.
Summary of the invention
Goal of the invention: the first object of the present invention is to provide a kind of digital pre-distortion system of digital Multibeam Transmitter System, while also providing a kind of digital pre-distortion method of digital Multibeam Transmitter, it is intended to which solve that wave beam can not be formed asks Inscribe and realize the linearisation of wave beam.
Technical solution: a kind of digital pre-distortion system of digital Multibeam Transmitter, the system comprises digital waves Beam shaping network, digital pre-distortion block, coefficient extracting module, power amplifier, launching antenna array, feedback loop receiving antenna With signal decomposition module, several beam signals carry out phase shift and corresponding addition in digital Wave-packet shaping network, if generating Dry output signal, is then separately input to generate digital predistortion signal in corresponding digital pre-distortion block, will then count Word pre-distorted signals are transferred in corresponding power amplifier, the output feed-in launching antenna array and spoke of the power amplifier It penetrates, target position in space generates corresponding wave beam；The feedback loop receiving antenna for placing any position in space will The signal received is sent into signal decomposition module, obtains the corresponding output of K power amplifier by signal decomposition model decomposition Signal is simultaneously sent into corresponding coefficient extracting module, and the coefficient extracting module, then will be defeated for extracting digital pre-distortion coefficient Coefficient out is sent into corresponding digital pre-distortion block and carries out coefficient update.
Further, the digital Wave-packet shaping network includes beam forming model, the beam forming model mathematics Expression formula is as follows:
In formula, zk(n) n-th of sample of k-th of the output signal generated for digital Wave-packet shaping network, the value of n Range determines by the specific sampling time, xmIt (n) is n-th of sample of m-th of wave beam input signal, M is of beam signal Number, αkmIt is the phase that corresponding m-th of wave beam input signal of k-th of output is assigned in digital beam-forming network.
The digital pre-distortion block carries digital pre-distortion model, and digital pre-distortion model expression formula is as follows:
In formula, u (n) is n-th of sample of the digital predistortion signal that digital pre-distortion block generates, the value range of n It is determined by the specific sampling time, Q is memory depth, and P is the order that coefficient extracts model, aqIt is for memory depth in linear term The coefficient of the corresponding entry of q, cpq,1For the coefficient for the corresponding entry that order is p and memory depth is q in single order item, cpq,21For the first The coefficient for the corresponding entry that order is p in second order term and memory depth is q, cpq,22It is p and memory for order in second of second order term Depth is the coefficient of the corresponding entry of q, cpq,23For the coefficient for the corresponding entry that order is p and memory depth is q in the third second order term, cpq,24For the coefficient for the corresponding entry that order is p and memory depth is q in the 4th kind of second order term, z (n-q) is the n-th-of input signal Q sample, z (n) are n-th of sample of input signal, βpFor the corresponding thresholding of p rank, βp=p/P, θ (n-q) are z (n-q's) Phase.
The signal decomposition module carries signal decomposition model, the following institute of the mathematic(al) representation of the signal decomposition model Show:
In formula, y (n) is n-th of sample for receiving the signal that antenna receives, when the value range of n is by specifically sampling Between determine, Q is memory depth, and P is nonlinear order, and K is the number in channel in transmitter, akqFor the output in k-th of channel Memory depth is the coefficient of the corresponding entry of q, c in the corresponding linear term of signalkpq,1For the output signal in k-th of channel corresponding one The coefficient for the corresponding entry that order is p and memory depth is q in rank, ckpq,21For the output signal in k-th of channel corresponding first The coefficient for the corresponding entry that order is p and memory depth is q in kind second order term, ckpq,22Output signal for k-th of channel is corresponding The coefficient for the corresponding entry that order is p in second of second order term and memory depth is q, ckpq,23For the output signal pair in k-th of channel The coefficient for the corresponding entry that order is p and memory depth is q in the third second order term answered, ckpq,24For the output letter in k-th of channel The coefficient for the corresponding entry that order is p and memory depth is q in number corresponding 4th kind of second order term, ukIt (n-q) is k-th of channel N-th-q samples of input signal, uk(n) for k-th of channel input signal n-th of sample, zkIt (n) is k-th of channel N-th of sample of output signal, βpFor the corresponding thresholding of p rank, βp=p/P, θkIt (n-q) is uk(n-q) phase.
Digital pre-distortion block and the number K of coefficient extracting module are protected with channel number in actual transmission machine in the system It holds consistent.
A kind of digital pre-distortion method of the digital pre-distortion system of digital Multibeam Transmitter, comprising the following steps:
(1) M beam signal enters digital beam-forming network using beam forming model K output signal of generation, and M is The number of wave beam in real system, K are the number in channel in transmitter；
(2) K output signal is successively sent in corresponding digital pre-distortion block respectively, corresponding digital pre-distortion block Generate corresponding digital predistortion signal；
(3) K digital predistortion signal is sent to corresponding coefficient extracting module, while being sent to corresponding power amplifier and producing Raw output signal；
(4) it the output signal feed-in transmitting antenna array of K power amplifier and radiate, target position in space It sets and generates M wave beam；
(5) signal received is sent into signal decomposition mould by the feedback loop receiving antenna for placing any position in space Block obtains the corresponding output signal of K power amplifier using signal decomposition model decomposition and is sent into corresponding coefficient extraction mould Block；
(6) by extracting corresponding digital pre-distortion coefficient in coefficient extracting module, corresponding number then is sent into output Coefficient is updated in predistortion module；
(7) iterative step (1)-step (6), until stopping iteration after meeting linearity requirements.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1) beam forming is realized in numeric field, considerably increase the flexibility ratio of beam scanning；
2) based on traditional digital pre-distortion technology and signal decomposition, solving wave beam can not be formed and non-linear distortion Problem can be generated wave beam with lower cost and realize linearisation；
3) the advantages of inheriting conventional digital pre-distortion technology, by the way that digital pre-distortion block is placed on digital wave beam After shaping network, is realized and linearized with lower complexity.
Detailed description of the invention
Fig. 1 is the block diagram of the system in the specific embodiment of the invention；
Fig. 2 is the power spectrum chart of output signal of the digital pre-distortion on 1 direction of wave beam in embodiment；
Fig. 3 is the power spectrum chart of output signal of the digital pre-distortion on 2 direction of wave beam in embodiment；
Fig. 4 is the power spectrum chart of output signal of the digital pre-distortion on 3 direction of wave beam in embodiment.
Specific embodiment
In order to which technical solution disclosed in this invention is described in detail, With reference to embodiment with attached drawing to this hair It is bright to be further introduced.
The present invention is to provide the digital pre-distortion systems and method of a kind of digital Multibeam Transmitter.For digital The digital pre-distortion system of Multibeam Transmitter, as shown in Figure 1, including digital Wave-packet shaping network, M beam signal is in wave Then phase shift and corresponding be added generates K and export in beam shaping network is sent to corresponding first digital pre-distortion block, the respectively Two digital pre-distortion blocks ..., K digital pre-distortion block generate corresponding digital predistortion signal；Then K number is pre- Distorted signal be sent to corresponding first coefficient extracting module, the second coefficient extracting module ..., k-factor extraction module, simultaneously It is sent to corresponding power amplifier；The output feed-in transmitting antenna array of K power amplifier of next step is simultaneously radiate, thus Target position in space generates M wave beam；The feedback loop receiving antenna for placing any position in space will receive Signal be sent into signal decomposition module, obtain the corresponding output signal of K power amplifier simultaneously using signal decomposition model decomposition Be sent into corresponding first coefficient extracting module, the second coefficient extracting module ..., k-factor extraction module is for extracting number Then the coefficient of output is sent into corresponding first digital pre-distortion block, the second digital pre-distortion mould by pre-distortion coefficients Block ..., K digital pre-distortion block is for updating coefficient.
Wherein, digital Wave-packet shaping network includes beam forming model, shown in beam forming model such as formula (1):
In formula (1), zk(n) n-th of sample of k-th of the output signal generated for digital Wave-packet shaping network, n's takes Value range determines by the specific sampling time, xmIt (n) is n-th of sample of m-th of wave beam input signal, M is beam signal Number, αkmIt is the phase that corresponding m-th of wave beam input signal of k-th of output is assigned in digital beam-forming network.
Wherein, digital pre-distortion block includes digital pre-distortion model, shown in digital pre-distortion model such as formula (2):
In formula (1), u (n) is n-th of sample of the digital predistortion signal that digital pre-distortion block generates, the value model of n It encloses and is determined by the specific sampling time, Q is memory depth, and P is the order that coefficient extracts model, aqFor memory depth in linear term For the coefficient of the corresponding entry of q, cpq,1For the coefficient for the corresponding entry that order is p and memory depth is q in single order item, cpq,21It is first The coefficient for the corresponding entry that order is p and memory depth is q in kind second order term, cpq,22It is p and note for order in second of second order term Recall the coefficient for the corresponding entry that depth is q, cpq,23What it is for order is p and memory depth is q in the third second order term corresponding entry is Number, cpq,24For the coefficient for the corresponding entry that order is p and memory depth is q in the 4th kind of second order term, z (n-q) is input signal N-th-q samples, z (n) are n-th of sample of input signal, βpFor the corresponding thresholding of p rank, βp=p/P, θ (n-q) are z (n- Q) phase.
Wherein, signal decomposition module includes signal decomposition model, shown in signal decomposition model such as formula (3):
In formula (1), y (n) is n-th of sample for receiving the signal that antenna receives, and the value range of n is by specifically sampling Time determines that Q is memory depth, and P is nonlinear order, and K is the number in channel in transmitter, akqFor the defeated of k-th channel The coefficient for the corresponding entry that memory depth is q in the corresponding linear term of signal out, ckpq,1Output signal for k-th of channel is corresponding The coefficient for the corresponding entry that order is p in single order item and memory depth is q, ckpq,21For the output signal in k-th of channel corresponding A kind of coefficient for the corresponding entry that order is p and memory depth is q in second order term, ckpq,22It is corresponding for the output signal in k-th of channel Second of second order term in order is p and memory depth is q corresponding entry coefficient, ckpq,23For the output signal in k-th of channel The coefficient for the corresponding entry that order is p and memory depth is q in the third corresponding second order term, ckpq,24For the output in k-th of channel The coefficient for the corresponding entry that order is p and memory depth is q in the corresponding 4th kind of second order term of signal, ukIt (n-q) is k-th of channel Input signal the n-th-q samples, uk(n) for k-th of channel input signal n-th of sample, zkIt (n) is k-th of channel Output signal n-th of sample, βpFor the corresponding thresholding of p rank, βp=p/P, θkIt (n-q) is uk(n-q) phase.
A kind of digital pre-distortion method of digital Multibeam Transmitter provided by the present invention, comprising the following steps:
S1:M beam signal enters digital beam-forming network and generates K output signal using beam forming model, and M is The number of wave beam in real system, K are the number in channel in transmitter；
S2:K output signal is successively sent to corresponding first digital pre-distortion block, the second digital pre-distortion mould Block ..., K digital pre-distortion block generate corresponding digital predistortion signal；
S3:K digital predistortion signal be sent to corresponding first coefficient extracting module, the second coefficient extracting module ..., K-factor extraction module, while being sent to corresponding power amplifier and generating output signal；
The output signal feed-in transmitting antenna array of S4:K power amplifier is simultaneously radiate, target position in space It sets and generates M wave beam；
S5: the signal received is sent into signal decomposition mould by the feedback loop receiving antenna for placing any position in space Block, obtains the corresponding output signal of K power amplifier using signal decomposition model decomposition and is sent into corresponding first coefficient mentioning Modulus block, the second coefficient extracting module ..., k-factor extraction module；
S6: the first coefficient extracting module, the second coefficient extracting module ..., extract in k-factor extraction module and correspond to Digital pre-distortion coefficient, corresponding first digital pre-distortion block, the second digital pre-distortion mould then are sent into output Block ..., K digital pre-distortion block is for updating coefficient；
S7: iteration S1-S6, until stopping iteration after meeting linearity requirements.
Channel number keeps one in the number K and actual transmission machine of above-mentioned digital pre-distortion block and coefficient extracting module It causes, can increase according to actual needs.
It is the input signal of 20MHz with three bandwidth, tool is there are three the digital Multibeam Transmitter in two channels of wave beam Example, wherein non-linear order and memory depth are taken as 8 and 4, digital Wave-packet shaping network assigns the phase of three beam signals Difference is respectively -45 degree, 0 degree and 45 degree.On three object beam directions, before digital pre-distortion technology proposed by the present invention The power spectrum chart of output signal afterwards such as Fig. 2-Fig. 4, adjacent channel leakage are more as shown in table 1 than (ACLR).Therefrom it can be seen that, phase Than having compensated well for non-linear mistake using digital pre-distortion technology proposed by the present invention in not using digital pre-distortion technology Very, adjacent channel leakage ratio can be lifted beyond 10dB.Meanwhile it will be using defeated after digital pre-distortion technology proposed by the present invention Signal is decomposed to obtain the signal of three wave beams out, and calculates normalization root-mean-square error such as table with original wave beam input signal Shown in 2, due at this time calculating normalization root mean square using wave beam can not be formed before digital pre-distortion technology proposed by the present invention Error is nonsensical, so not listing.As can be seen from Table 2, it after using digital pre-distortion technology proposed by the present invention, solves The problem of wave beam can not be formed, the normalization root-mean-square error on three beam directions are respectively less than -40dB, show inband distortion It is all compensated well for out-of-band distortion.
1 adjacent channel leakage power (dBc) of table
Table 2 normalizes root-mean-square error (dB)

Claims (6)

1.一种全数字多波束发射机的数字预失真系统，其特征在于：所述系统包括全数字波束成形网络、数字预失真模块、系数提取模块、功率放大器、发射天线阵、反馈回路接收天线和信号分解模块，若干个波束信号在全数字波束成形网络中进行移相并对应相加，产生若干个输出信号，然后分别输入到对应的数字预失真模块中产生数字预失真信号，接着将数字预失真信号传输到对应的功率放大器中，所述功率放大器的输出馈入发射天线阵并辐射，在空间中的目标位置产生相应的波束；放置在空间中任意位置的反馈回路接收天线将接收到的信号送入信号分解模块，通过信号分解模型分解得到K个功率放大器对应的输出信号并送入对应的系数提取模块，所述系数提取模块用于提取数字预失真系数，然后将输出的系数送入对应的数字预失真模块中进行系数更新。1. a digital predistortion system of an all-digital multi-beam transmitter, characterized in that: the system comprises an all-digital beamforming network, a digital predistortion module, a coefficient extraction module, a power amplifier, a transmitting antenna array, a feedback loop receiving antenna And the signal decomposition module, several beam signals are phase-shifted and added correspondingly in the all-digital beamforming network to generate several output signals, which are then input to the corresponding digital predistortion modules to generate digital predistortion signals, and then the digital predistortion signals are generated. The predistorted signal is transmitted to the corresponding power amplifier, and the output of the power amplifier is fed into the transmitting antenna array and radiated to generate the corresponding beam at the target position in space; the feedback loop receiving antenna placed at any position in the space will receive the signal. The signal is sent to the signal decomposition module, and the corresponding output signals of the K power amplifiers are decomposed through the signal decomposition model and sent to the corresponding coefficient extraction module. The coefficient extraction module is used to extract the digital predistortion coefficient, and then the output coefficient is sent to into the corresponding digital predistortion module to update the coefficients. 2.根据权利要求1所述的全数字多波束发射机的数字预失真系统，其特征在于：所述全数字波束成形网络包括波束成形模型，所述波束成形模型数学表达式如下：2. The digital predistortion system of an all-digital multi-beam transmitter according to claim 1, wherein the all-digital beamforming network comprises a beamforming model, and the mathematical expression of the beamforming model is as follows: 式中，zk(n)为全数字波束成形网络生成的第k个输出信号的第n个样本，n的取值范围由具体的采样时间决定，xm(n)为第m个波束输入信号的第n个样本，M为波束信号的个数，αkm是数字波束成形网络中赋予第k个输出的对应的第m个波束输入信号的相位。In the formula, z k (n) is the n-th sample of the k-th output signal generated by the all-digital beamforming network, the value range of n is determined by the specific sampling time, and x m (n) is the m-th beam input. The nth sample of the signal, M is the number of beam signals, and α km is the phase of the corresponding mth beam input signal assigned to the kth output in the digital beamforming network. 3.根据权利要求1所述的全数字多波束发射机的数字预失真系统，其特征在于：所述数字预失真模块搭载数字预失真模型，数字预失真模型表达式如下所示：3. the digital predistortion system of all-digital multi-beam transmitter according to claim 1, is characterized in that: described digital predistortion module is equipped with digital predistortion model, and digital predistortion model expression is as follows: 式中，u(n)为数字预失真模块生成的数字预失真信号的第n个样本，n的取值范围由具体的采样时间决定，Q为记忆深度，P为系数提取模型的阶数，aq为线性项中记忆深度为q的相应项的系数，cpq,1为一阶项中阶数为p且记忆深度为q的相应项的系数，cpq,21为第一种二阶项中阶数为p且记忆深度为q的相应项的系数，cpq,22为第二种二阶项中阶数为p且记忆深度为q的相应项的系数，cpq,23为第三种二阶项中阶数为p且记忆深度为q的相应项的系数，cpq,24为第四种二阶项中阶数为p且记忆深度为q的相应项的系数，z(n-q)为输入信号的第n-q个样本，z(n)为输入信号的第n个样本，βp为p阶项对应的门限，βp＝p/P，θ(n-q)为z(n-q)的相位。In the formula, u(n) is the nth sample of the digital predistortion signal generated by the digital predistortion module, the value range of n is determined by the specific sampling time, Q is the memory depth, P is the order of the coefficient extraction model, a q is the coefficient of the corresponding item with the memory depth q in the linear term, c pq,1 is the coefficient of the corresponding item with the order p and the memory depth q in the first-order item, and c pq,21 is the first-order second-order The coefficient of the corresponding item of order p and memory depth q in the term, c pq,22 is the coefficient of the corresponding item of order p and memory depth q in the second-order second-order term, and c pq,23 is the first The coefficients of the corresponding terms of order p and memory depth q among the three second-order terms, c pq,24 are the coefficients of the corresponding terms of the fourth second-order terms of order p and memory depth q, z( nq) is the nqth sample of the input signal, z(n) is the nth sample of the input signal, β p is the threshold corresponding to the p-order term, β p =p/P, θ(nq) is z(nq) phase. 4.根据权利要求1所述的全数字多波束发射机的数字预失真系统，其特征在于：所述信号分解模块搭载信号分解模型，所述信号分解模型的数学表达式如下所示：4. the digital predistortion system of all-digital multi-beam transmitter according to claim 1, is characterized in that: described signal decomposition module is equipped with signal decomposition model, and the mathematical expression of described signal decomposition model is as follows: 式中，y(n)为接受天线接收到的信号的第n个样本，n的取值范围由具体的采样时间决定，Q为记忆深度，P为非线性的阶数，K为发射机中通道的个数，akq为第k个通道的输出信号对应的线性项中记忆深度为q的相应项的系数，ckpq,1为第k个通道的输出信号对应的一阶项中阶数为p且记忆深度为q的相应项的系数，ckpq,21为第k个通道的输出信号对应的第一种二阶项中阶数为p且记忆深度为q的相应项的系数，ckpq,22为第k个通道的输出信号对应的第二种二阶项中阶数为p且记忆深度为q的相应项的系数，ckpq,23为第k个通道的输出信号对应的第三种二阶项中阶数为p且记忆深度为q的相应项的系数，ckpq,24为第k个通道的输出信号对应的第四种二阶项中阶数为p且记忆深度为q的相应项的系数，uk(n-q)为第k个通道的输入信号的第n-q个样本，uk(n)为第k个通道的输入信号的第n个样本，zk(n)为第k个通道的输出信号的第n个样本，βp为p阶项对应的门限，βp＝p/P，θk(n-q)为uk(n-q)的相位。In the formula, y(n) is the nth sample of the signal received by the receiving antenna, the value range of n is determined by the specific sampling time, Q is the memory depth, P is the nonlinear order, and K is the transmitter The number of channels, a kq is the coefficient of the corresponding item with memory depth q in the linear term corresponding to the output signal of the kth channel, c kpq,1 is the middle order of the first-order term corresponding to the output signal of the kth channel is the coefficient of the corresponding item of p and memory depth q, c kpq,21 is the coefficient of the corresponding item of order p and memory depth q of the first second-order item corresponding to the output signal of the kth channel, c kpq,22 is the coefficient of the second-order term corresponding to the output signal of the kth channel, the order is p and the memory depth is q, and c kpq,23 is the output signal of the kth channel. Among the three second-order terms, the coefficients of the corresponding terms of order p and memory depth q, c kpq,24 is the fourth second-order term corresponding to the output signal of the kth channel, the middle order is p and the memory depth is The coefficients of the corresponding terms of q, u k (nq) is the nq-th sample of the input signal of the k-th channel, u k (n) is the n-th sample of the input signal of the k-th channel, z k (n) is the nth sample of the output signal of the kth channel, β p is the threshold corresponding to the p-order term, β p =p/P, and θ k (nq) is the phase of u k (nq). 5.根据权利要求1所述的全数字多波束发射机的数字预失真系统，其特征在于：所述系统中数字预失真模块和系数提取模块的个数K与实际发射机中通道个数保持一致。5. the digital predistortion system of all-digital multi-beam transmitter according to claim 1, is characterized in that: the number K of digital predistortion module and coefficient extraction module in the described system keeps with the channel number in the actual transmitter Consistent. 6.如权利要求1所述的全数字多波束发射机的数字预失真系统的数字预失真方法，其特征在于：包括以下步骤：6. the digital predistortion method of the digital predistortion system of the all-digital multi-beam transmitter as claimed in claim 1, is characterized in that: comprise the following steps: (1)M个波束信号进入数字波束成形网络利用波束成形模型产生K个输出信号，M为实际系统中的波束的个数，K为发射机中通道的个数；(1) M beam signals enter the digital beamforming network and use the beamforming model to generate K output signals, where M is the number of beams in the actual system, and K is the number of channels in the transmitter; (2)K个输出信号分别依次送到对应的数字预失真模块中，对应的数字预失真模块产生对应的数字预失真信号；(2) The K output signals are respectively sent to the corresponding digital predistortion modules in turn, and the corresponding digital predistortion modules generate corresponding digital predistortion signals; (3)K个数字预失真信号送到对应的系数提取模块，同时送到对应的功率放大器产生输出信号；(3) K digital predistortion signals are sent to the corresponding coefficient extraction module, and at the same time sent to the corresponding power amplifier to generate output signals; (4)K个功率放大器的输出信号馈入发射天线阵列并辐射出去，在空间中的目标位置产生M个波束；(4) The output signals of the K power amplifiers are fed into the transmitting antenna array and radiated out to generate M beams at the target position in space; (5)放置在空间中任意位置的反馈回路接收天线将接收到的信号送入信号分解模块，利用信号分解模型分解得到K个功率放大器对应的输出信号并送入对应的系数提取模块；(5) The feedback loop receiving antenna placed at any position in the space sends the received signal into the signal decomposition module, and uses the signal decomposition model to decompose to obtain the output signals corresponding to the K power amplifiers and send them to the corresponding coefficient extraction module; (6)由系数提取模块中提取对应的数字预失真系数，然后将输出送入对应的数字预失真模块中更新系数；(6) extract the corresponding digital predistortion coefficient from the coefficient extraction module, and then send the output into the corresponding digital predistortion module to update the coefficient; (7)迭代步骤(1)-步骤(6)，直至满足线性化要求后停止迭代。(7) Iterate step (1)-step (6), stop the iteration until the linearization requirement is met.
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