CN111082756B - Digital-analog mixed predistortion structure for MIMO transmitter - Google Patents
Digital-analog mixed predistortion structure for MIMO transmitter Download PDFInfo
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Abstract
The invention provides a digital-analog mixed predistortion structure for a MIMO transmitter, and belongs to the technical field of linearization of power amplifiers. Based on the predistortion scheme adopted in the traditional multi-input multi-output transmitter, the invention arranges a plurality of analog predistorters at the back through a public digital predistorter, and simultaneously adds a feedback loop which is subjected to designed analog predistortion consistency detection and analog predistortion consistency adjustment and is output by a power amplifier to be compensated to each path of analog predistorter, and the above units are cascaded to form a digital-analog mixed predistortion structure, thereby realizing a novel digital-analog mixed predistortion structure with low cost and good linearization effect for the MIMO transmitter.
Description
Technical Field
The invention belongs to the technical field of linearization of a power amplifier, and particularly relates to a novel digital and analog hybrid predistortion structure for a hybrid beam forming MIMO transmitter.
Background
With the change of the era, the wireless communication technology has entered the development period of the fifth generation at high speed. Because of the improvement of communication rate and the need of improving spectrum utilization, the modulation mode of the currently used high-frequency band utilization often has the characteristic of high peak-to-average ratio, which can bring challenges to the trade-off of efficiency and linearity. The power amplifier is a key device in a communication link, and the nonlinear characteristics of the power amplifier adversely affect the performance of the communication system, which requires the power amplifier to have higher linearity.
A number of power amplifier linearization techniques are currently proposed, such as: feedforward techniques, negative feedback techniques, predistortion techniques, and the like. Predistortion techniques are in turn divided into digital predistortion and analog predistortion. The digital predistortion technology has the characteristics of high precision, good stability, low cost, good performance and the like, but has the disadvantages of high power consumption, high requirement on a digital-to-analog converter required by a broadband signal and the like. Analog predistortion has the advantages of low cost, high bandwidth and the like, and is difficult to solve the problem of nonlinear distortion caused by memory effect in a power amplifier.
We therefore generally employ a digital-to-analog hybrid predistortion scheme in a multiple-input multiple-output (MIMO) transmitter to solve the above problems. Since the multiple power amplifiers do not always use the same device, the Digital Predistorter (DPD) module needs to be designed separately according to the characteristics of each power amplifier, so that a multiple predistortion scheme of combining one digital predistorter with one analog predistorter is commonly adopted in the multiple-input multiple-output transmitter at present, n paths need n digital predistorters and n Analog Predistorters (APDs), and the implementation cost becomes the biggest problem.
Therefore, how to trade off the contradiction between the cost and the performance existing in the mimo transmitter becomes a problem to be solved.
Disclosure of Invention
In view of the contradictory problems existing in the prior art, the invention aims to provide a novel digital-analog hybrid predistortion structure for a MIMO transmitter. Based on the predistortion scheme adopted in the traditional multi-input multi-output transmitter, the invention arranges a plurality of analog predistorters at the back through a public digital predistorter, and simultaneously adds a feedback loop which is subjected to designed analog predistortion consistency detection and analog predistortion consistency adjustment and is output by a power amplifier to be compensated to each path of analog predistorter, and the above units are cascaded to form a digital-analog mixed predistortion structure, thereby realizing a novel digital-analog mixed predistortion structure with low cost and good linearization effect for the MIMO transmitter.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a digital-to-analog hybrid predistortion architecture for a MIMO transmitter, comprising: a digital pre-coding unit, a digital pre-distorter, one or more analog pre-distorting circuits, wherein the analog pre-distorting circuits comprise: the device comprises a D/A conversion unit, a frequency mixing unit, an analog beam forming unit, a plurality of analog predistorters, a plurality of power amplifiers, a PA consistency adjustment unit and a PA consistency detection unit; in the analog predistortion circuit, one analog predistorter corresponds to one power amplifier; the signal in the digital-analog mixed predistortion structure is sequentially output after passing through a digital precoding unit, a digital predistorter, a D/A conversion unit, a frequency mixing unit, an analog beam forming unit, a plurality of analog predistorters and a plurality of power amplifiers, wherein the PA consistency detection unit is used for carrying out consistency detection on each path of Power Amplifier (PA), obtaining a feedback signal from each path of power amplifier, and outputting the feedback signal to the PA consistency adjustment unit after processing; the PA consistency adjustment unit is used for respectively outputting the result obtained by the PA consistency detection to each path of analog predistorter; the digital pre-coding unit is used for modulating an input baseband signal by using matrix processing to obtain a symbol stream, and minimizing interference between different users and antennas; the digital predistorter is used for carrying out digital predistortion processing on the baseband signal symbol stream, compensating dynamic nonlinear distortion and respectively outputting the dynamic nonlinear distortion to the corresponding analog predistortion circuit; the D/A conversion is used for converting the symbol digital stream obtained after the digital predistortion into an analog signal; the frequency mixing is used for mixing the analog signals obtained in the previous step to a radio frequency band through a local oscillator; the analog beam forming unit is used for adjusting the phases of the antenna receiving and transmitting signals through the phase shifter, dividing the processed signals into multiple paths and respectively outputting the multiple paths of processed signals to analog predistorters corresponding to the subsequent stages; the analog predistorter is used for performing analog predistortion processing on a pre-stage signal and receiving a signal from the PA consistency adjustment unit.
In summary, by adopting the technical scheme, the invention has the beneficial effects that:
1. based on the structure of the present MIMO transmitter, a hybrid structure of digital predistortion and analog predistortion is used to achieve linearization of the power amplifier. Wherein the digital predistortion compensates for dynamic nonlinear distortion and the analog predistortion compensates for static nonlinearity.
2. The novel structure can realize the predistortion effect of the MIMO transmitter by adding the PA consistency detection unit and the PA consistency adjustment unit and using only one digital predistorter and a plurality of paths of analog predistorters. The system implementation mode can be simplified, the cost can be reduced, and the volume of the whole MIMO transmitter can be reduced.
Drawings
Fig. 1 is a block diagram of a novel digital-to-analog hybrid predistortion architecture with only a single analog beamforming unit available for a MIMO transmitter.
Fig. 2 is a block diagram of a novel digital-to-analog hybrid predistortion architecture for a MIMO transmitter with n analog beamforming units.
FIG. 3 is a graph of predistortion effects of consistency adjusted AM-AM (amplitude distortion of the output signal to the input signal) at different analog predistorter control voltages; 6 curves are included from left to right in fig. 3, PA2, PA1, acv=0.3 v, acv=1.4 v, acv=2.4 v, acv=3.5 v, where PA1 is a white line.
Fig. 4 is a graph (center frequency is 3.5 GHz) comparing the power spectrum density of the original output signal of the power amplifier with the power spectrum density of the digital-to-analog mixed predistortion structure without the inventive structure, i.e., without the addition of the consistency detecting and adjusting unit, and with the inventive structure, i.e., with the addition of the consistency detecting and adjusting unit.
Fig. 5 is a graph (unit: dBm) comparing the power ratio ACPR (Adjacent Channel Power Ratio) of the adjacent channels using the inventive structure, i.e., the structure with the consistency detecting and adjusting unit added, with the structure without the inventive structure, i.e., the structure with the consistency detecting and adjusting unit added.
Detailed Description
The present invention will be described in further detail with reference to the embodiments and the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
A novel digital-analog mixed predistortion structure for MIMO transmitter comprises a digital precoding unit, a digital predistorter, a D/A conversion unit, a frequency mixing unit, an analog beam forming unit, an analog predistorter, a PA consistency detection unit and a PA consistency adjustment unit. The digital pre-coding unit is used for modulating an input baseband signal by matrix processing to obtain a symbol stream and minimizing interference between different users and antennas. The digital predistorter is used for carrying out digital predistortion processing on the baseband signal symbol stream and outputting the baseband signal symbol stream to D/A conversion. The D/A conversion is used for converting the symbol digital stream obtained after digital pre-coding into an analog signal. The frequency mixing is used for mixing the analog signals obtained in the previous step to a radio frequency band through a local oscillator. The analog beam forming unit is used for adjusting the phases of the antenna receiving and transmitting signals through the phase shifter, dividing the processed signals into a plurality of paths and respectively outputting the paths to the analog predistorters corresponding to the later stages. The analog predistorter is used for performing analog predistortion processing on a pre-stage signal and receiving a signal from the PA consistency adjustment unit. The PA consistency detection unit is used for carrying out consistency detection on each path of Power Amplifier (PA), obtaining feedback signals from each path of power amplifier, processing the feedback signals and outputting the processed feedback signals to the PA consistency adjustment unit. And the PA consistency adjustment unit is used for respectively outputting the results obtained by the PA consistency detection to each path of analog predistorter.
A block diagram of a novel digital-to-analog hybrid predistortion architecture with only a single analog beamforming unit available for a MIMO transmitter is shown in fig. 1. The main function is that the input baseband signal is processed and modulated by a digital pre-coding matrix to obtain a symbol stream, the symbol stream is input to a digital pre-distorter to carry out digital pre-distortion treatment to compensate dynamic nonlinear distortion, the digital signal after the digital pre-distortion treatment is converted into an analog signal, the analog signal is mixed to a radio frequency band by a local oscillator and then is subjected to phase adjustment of an antenna receiving and transmitting signal by an analog beam forming unit, the processed signal is divided into multiple paths to be respectively output to the analog pre-distorter corresponding to a rear stage, the analog pre-distorter receives the signal from a front stage and the signal from a PA consistency adjustment unit, and the final signal is respectively output to each PA.
Fig. 2 is a block diagram of a novel digital-analog hybrid predistortion architecture for a MIMO transmitter with n analog beamforming units. The main function is that the input baseband signal is processed and modulated by a digital pre-coding matrix to obtain a symbol stream, the symbol stream is input to a digital predistorter to carry out digital pre-distortion treatment to compensate dynamic nonlinear distortion, then the multipath digital signals after digital pre-distortion treatment are respectively converted into multipath analog signals, the multipath analog signals are respectively mixed to a radio frequency band by a local oscillator and then are respectively output to corresponding analog predistorters at the rear stage after being subjected to phase adjustment of antenna receiving and transmitting signals by n corresponding analog beam forming units, the processed signals are respectively divided into multiple paths and are respectively output to the corresponding analog predistorters at the front stage, the corresponding analog predistorters receive signals from the front stage and signals from a PA consistency adjusting unit, and finally the signals are respectively output to each PA.
Example 1
A novel digital-analog mixed predistortion structure for MIMO transmitter only has a single analog beam forming unit, the structure block diagram is shown in figure 1, and the structure block diagram mainly comprises eight modules:
digital precoding: the main function is to process the modulated symbol stream with a precoding matrix on the transmitted signal at the transmitting end of the downlink using clutter suppression interferometry CSI (Clutter Suppression Interferometry) and input to a digital predistorter.
Digital predistorter: the main function is to reprocess the signal processed by the pre-coding matrix to compensate the dynamic nonlinear distortion of the power amplifier and output to the D/A conversion.
D/A conversion: the digital-to-analog converter DAC (digital analog converter) mainly converts the output signal of the digital predistorter from digital to analog and outputs the converted signal to the mixer.
Mixing: the device consists of a local oscillator and a mixer, and has the main function of mixing and moving the analog signals output by D/A conversion to a radio frequency band and outputting the signals to an analog beam forming unit.
Analog beamforming unit: the phase shifter is used for adjusting the phase of the mixed output signal through the phase shifter, so that the purpose of adjusting the phase of the antenna receiving and transmitting signals is achieved, and the signals are output to n paths of analog predistorters (APD 0-APDn).
PA consistency detection unit: based on the cross normalization mean square error CNMSE (Crossed Normalized Mean Square Error) algorithm, the main function is to receive feedback signals of n paths of power amplifiers PA (PA 0-PAn) after n paths of analog predistorters, and each path of feedback signals is respectively subjected to consistency detection and output to a PA consistency adjusting unit.
PA consistency adjustment unit: the method is composed of a consistency adjustment algorithm, and has the main function of carrying out consistency compensation adjustment on n paths of analog predistorters (APD 0-APDn) before n paths of different power amplifiers (PA 0-PAn). The main function is to compensate the inconsistency of the PA after the n-path analog predistorter. Output to n-way analog predistorters (APD 0-APDn).
The analog predistorter is composed of n paths (APD 0-APDn) and mainly has the function of performing static nonlinear compensation on signals subjected to phase adjustment by an analog beam forming unit, wherein the static nonlinear compensation comprises compensation for PA consistency adjustment. The signals after the compensation of the two signals are output to n paths of power amplifiers PA (PA 0-PAn).
The final output signal can compensate dynamic nonlinear distortion and static nonlinear distortion of the power amplifier through theoretical analysis.
Example 2
A novel digital-analog mixed predistortion structure for MIMO transmitter comprises n paths of analog beam forming units, the structural block diagram of which is shown in figure 2, and the structure is mainly composed of eight modules:
digital precoding: the main function is to process the modulated symbol stream with a precoding matrix on the transmitted signal at the transmitting end of the downlink using clutter suppression interferometry CSI (Clutter Suppression Interferometry) and input to a digital predistorter.
Digital predistorter: the main function is to reprocess the signal processed by the pre-coding matrix to compensate the dynamic nonlinear distortion of the power amplifier and output to the D/A conversion.
D/A conversion: the digital-to-analog converter DAC (digital analog converter) mainly converts the output signal of the digital predistorter from digital to analog and outputs the converted signal to the mixer.
Mixing: the device consists of a local oscillator and a mixer, and has the main function of mixing and moving the analog signals output by D/A conversion to a radio frequency band and outputting the signals to an analog beam forming unit.
Analog beamforming unit: the phase shifter and the power divider are used for forming the n-path analog beam forming units. The main function is to adjust the phase of the mixed output signal through a phase shifter, so as to achieve the purpose of adjusting the phase of the antenna receiving and transmitting signals, and each path of analog beam forming unit is output to n paths of analog predistorters (APD 0-APDn).
PA consistency detection unit: based on the cross normalization mean square error CNMSE (Crossed Normalized Mean Square Error) algorithm, the main function is to receive feedback signals of n paths of power amplifiers PA (PA 0-PAn) after n paths of analog predistorters, and each path of feedback signals is respectively subjected to consistency detection and output to a PA consistency adjusting unit.
The PA consistency adjustment unit is composed of a consistency adjustment algorithm and mainly has the function of carrying out consistency compensation adjustment on n paths of analog predistorters (APD 0-APDn) before n paths of different power amplifiers PA (PA 0-PAn). The main function is to compensate the inconsistency of the PA after the n-path analog predistorter. Output to n-way analog predistorters (APD 0-APDn).
The analog predistorter is composed of n paths (APD 0-APDn) and mainly has the function of performing static nonlinear compensation on signals subjected to phase adjustment by an analog beam forming unit, wherein the static nonlinear compensation comprises compensation for PA consistency adjustment. The signals after the compensation of the two signals are output to n paths of power amplifiers PA (PA 0-PAn).
The final output signal can compensate dynamic nonlinear distortion and static nonlinear distortion of the power amplifier through theoretical analysis.
Fig. 3 shows a predistortion effect diagram of AM-AM (amplitude distortion of the output signal to the input signal) with consistency adjustment under different analog predistorter control voltages. The abscissa represents the normalized input signal amplitude, the ordinate represents the normalized output signal amplitude, and 6 curves are included from left to right in the figure, and are PA2, PA1, acv=0.3v, acv=1.4v, acv=2.4v, acv=3.5v, and PA1 white line in turn. The PA1 points to a thinner curve as an amplitude distortion curve of the output signal of the power amplifier 1 to the input signal without adding the consistency detecting and adjusting unit, the PA2 points to a thicker curve as an amplitude distortion curve of the output signal of the power amplifier 2 to the input signal without adding the consistency detecting and adjusting unit, the curve pointed by ACV (APD Control Voltage, analog predistorter control voltage) =0.3 is an amplitude distortion curve of the output signal of the power amplifier 1 and 2 to the input signal after adding the consistency detecting and adjusting unit when the consistency adjusting control voltage is 0.3V, the curve pointed by acv=1.4 is an amplitude distortion curve of the output signal of the power amplifier 1 and 2 to the input signal after adding the consistency detecting and adjusting unit when the consistency adjusting control voltage is 1.4V, the curve pointed by acv=2.4 is an amplitude distortion curve of the output signal of the power amplifier 1 and 2 to the input signal when the consistency adjusting unit is 2.4V, and the curve pointed by acv=3.5 is an amplitude distortion curve of the output signal of the power amplifier 1 and the consistency adjusting unit when the consistency adjusting voltage is 2.5. It can be seen from the figure that the amplitude distortion curves of the output signals to the input signals of the power amplifiers 1 and 2 with ACV of 0.3v, 1.4v, 2.4v and 3.5v are basically similar to a straight line to represent good linearization effect, so that the digital-analog mixed predistortion structure added with the consistency detection and adjustment unit can better linearize the signals, thereby compensating the nonlinear distortion of the power amplifier, inhibiting the dispersion of the AM-AM curve to a certain extent and greatly improving the linearity of the power amplifier.
As shown in fig. 4, the power spectrum density of the original output signal of the power amplifier is compared with the parameter comparison chart (center frequency is 3.5 GHz) of the power spectrum density of the digital-analog mixed predistortion structure without using the structure of the present invention, i.e. without adding the consistency detecting and adjusting unit, and the digital-analog mixed predistortion structure with the consistency detecting and adjusting unit.Wherein the abscissa of fig. 5 represents frequency (in GHz) and the ordinate represents power spectral density (in dBm/Hz). Wherein the curve pointed by PA1 origin represents the relation of the power spectral density of the Original output signal of the power amplifier 1 without adding the consistency detection and adjustment unit and without using the conventional digital-to-analog mixed predistortion structure as a function of frequency, the curve pointed by PA1 w A-DPD represents the relation of the power spectral density of the output signal of the power amplifier 1 without adding the consistency detection and adjustment unit and without using the conventional digital-to-analog mixed predistortion structure as a function of frequency, PA1 w A 2 The DPD-directed curve represents the power spectral density of the output signal of the power amplifier 2 with the added consistency detection and adjustment unit as a function of frequency. Wherein the curve pointed to by PA2origin represents the relationship of the power spectral density of the Original output signal of the power amplifier 2 without the addition of the coincidence detecting and adjusting unit and without the use of the conventional digital-to-analog mixed predistortion structure as a function of frequency, the curve pointed to by PA2 w A-DPD represents the relationship of the power spectral density of the output signal of the power amplifier 2 without the addition of the coincidence detecting and adjusting unit but with the use of the conventional digital-to-analog mixed predistortion structure as a function of frequency, PA2 w A 2 The DPD-directed curve represents the power spectral density of the output signal of the power amplifier 2 with the added consistency detection and adjustment unit as a function of frequency. PA1 Original and PA1 w A 2 Comparison of the DPD and PA1 w A-DPD curves shows that the novel digital-to-analog hybrid predistortion structure with the added consistency detection and adjustment unit can achieve better linearization than the conventional digital-to-analog hybrid predistortion structure without the added predistortion module and the added consistency detection and adjustment unit. PA2Original and PA2 w A 2 Comparison of the DPD and PA2 w A-DPD curves shows that the novel digital-to-analog hybrid predistortion structure with the added consistency detection and adjustment unit can achieve better linearization than the conventional digital-to-analog hybrid predistortion structure without the added predistortion module and the added consistency detection and adjustment unit. The specific measurement parameter results are shown in fig. 5.
As shown in FIG. 5, the digital-to-analog ratio obtained by using the present invention, i.e., incorporating the consistency detecting and adjusting unit, is comparedThe adjacent channel power ratio ACPR (Adjacent Channel Power Ratio) parameter versus graph (unit: dBm) of the hybrid predistortion architecture and the digital-to-analog hybrid predistortion architecture without the inventive architecture, i.e., without the addition of a consistency detection and adjustment unit. The first row in fig. 4 represents respectively the allolower (data with the lowest adjacent channel power ratio), adj lower (data with the lowest adjacent channel power ratio), adj higher (data with the highest adjacent channel power ratio), alt higher (data with the lowest adjacent channel power ratio). The second row indicates that the following three rows of data are all the data index results of the alloy lower, adj higher, alt higher of the power amplifier 1. The third row shows the data index results of the alloy lower, adj higher, alt higher of the Original output signal (PA Original) of the power amplifier 1 without adding the consistency detection and adjustment unit and without using the conventional digital-analog mixed predistortion structure. The fourth row shows the data index results of the alloy lower, adj higher, alt higher of the output signal of the (With a-DPD) power amplifier 1 without adding the consistency detecting and adjusting unit but using the conventional digital-analog mixed predistortion structure. The fifth line shows the structure of the digital-analog hybrid predistortion after adding the coincidence detecting and adjusting unit (width a 2 DPD) power amplifier 1 outputs the data index results of the bit lower, adj higher, alt higher of the signal. The sixth row indicates that the following three rows of data are all the data index results of the alloy lower, adj higher, alt higher of the power amplifier 2. The seventh line shows the data index results of the alloy lower, adj higher, alt higher of the Original output signal (PA Original) of the power amplifier 2 without adding the consistency detecting and adjusting unit and without using the conventional digital-analog mixed predistortion structure. The eighth line shows the data index results of the alloy lower, adj higher, alt higher of the output signal of the (With a-DPD) power amplifier 2, which does not incorporate the consistency detecting and adjusting unit but uses the conventional digital-analog mixed predistortion structure. The ninth line shows the structure of the digital-analog hybrid predistortion after adding the coincidence detecting and adjusting unit (width a 2 DPD) power amplifier 2 outputs the data index results of the bit lower, adj higher, alt higher of the signal.
It can be seen from the table of fig. 5 that the power amplifier 1 Original signal (PA Original) is combined With the use of the conventional digital-to-analog mixed predistortion structure (With a-DPD) and the novel digital-to-analog mixed predistortion structure (With a 2 -DPD), the Alt lower, the Adj higher and the Alt higher respectively reach-59.6 dBm, -47.9dBm, -47.1dBm, -60.0dBm after PA1 passes through the traditional digital-analog mixed predistortion structure, respectively improve 12.9dBm, 17.6dBm, 17.0dBm and 12.2dBm, respectively, and the Alt lower, the Adj higher and the Alt higher respectively reach-59.6 dBm, -47.9dBm, -47.1dBm, -60.0dBm, respectively improve 12.3dBm, 20.7dBm, 21.5dBm and 12.7dBm after PA1 passes through the novel digital-analog mixed predistortion structure. The power amplifier 2Original signal (PA Original) is combined With a new digital-analog mixed predistortion architecture (With a-DPD) using a conventional digital-analog mixed predistortion architecture (With a-DPD) using the present invention 2 -DPD), the Alt lower, the Adj higher and the Alt higher respectively reach-58.7 dBm, -48.1dBm, -48.0dBm, -59.2dBm after PA2 passes through the traditional digital-analog mixed predistortion structure, 9.9dBm, 18.4dBm, 17.8dBm and 9.4dBm are respectively improved, and the Alt lower, the Adj higher and the Alt higher respectively reach-50.4 dBm, -51.1dBm, -52.6dBm, -58.3dBm and are respectively improved by 1.6dBm, 21.4dBm, 22.4dBm and 8.5dBm after PA1 passes through the novel digital-analog mixed predistortion structure. Compared with the traditional digital-analog mixed predistortion structure, the predistortion device can achieve the predistortion effect of the power amplifier at the same level.
Claims (1)
1. A digital-to-analog hybrid predistortion architecture for a MIMO transmitter, comprising: a digital pre-coding unit, a digital pre-distorter, one or more analog pre-distorting circuits, wherein the analog pre-distorting circuits comprise: the device comprises a D/A conversion unit, a frequency mixing unit, an analog beam forming unit, a plurality of analog predistorters, a plurality of power amplifiers, a PA consistency adjustment unit and a PA consistency detection unit; in the analog predistortion circuit, one analog predistorter corresponds to one power amplifier; the signal in the digital-analog mixed predistortion structure is sequentially output after passing through a digital precoding unit, a digital predistorter, a D/A conversion unit, a frequency mixing unit, an analog beam forming unit, a plurality of analog predistorters and a plurality of power amplifiers, wherein the PA consistency detection unit is used for carrying out consistency detection on each path of power amplifier, obtaining a feedback signal from each path of power amplifier, and outputting the feedback signal to the PA consistency adjustment unit after processing; the PA consistency adjustment unit is used for respectively outputting the result obtained by the PA consistency detection to each path of analog predistorter; the digital pre-coding unit is used for modulating an input baseband signal by using matrix processing to obtain a symbol stream, and minimizing interference between different users and antennas; the digital predistorter is used for carrying out digital predistortion processing on the baseband signal symbol stream, compensating dynamic nonlinear distortion and respectively outputting the dynamic nonlinear distortion to the corresponding analog predistortion circuit; the D/A conversion is used for converting the symbol digital stream obtained after the digital predistortion into an analog signal; the frequency mixing is used for mixing the analog signals obtained in the previous step to a radio frequency band through a local oscillator; the analog beam forming unit is used for adjusting the phases of the antenna receiving and transmitting signals through the phase shifter, dividing the processed signals into multiple paths and respectively outputting the multiple paths of processed signals to analog predistorters corresponding to the subsequent stages; the analog predistorter is used for performing analog predistortion processing on a pre-stage signal and receiving a signal from the PA consistency adjustment unit.
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