CN111082756A - 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 an MIMO transmitter, belonging to the technical field of power amplifier linearization. On the basis of a predistortion scheme adopted in a traditional multi-input multi-output transmitter, a plurality of analog predistorters are arranged behind a common digital predistorter, designed analog predistortion consistency detection and analog predistortion consistency adjustment are added, a feedback loop output by a power amplifier is compensated to the analog predistorter of each path, and the units are cascaded to form a digital-analog mixed predistortion structure, so that the novel digital-analog mixed predistortion structure for the MIMO transmitter with low cost and good linearization effect is realized.
Description
Technical Field
The invention belongs to the technical field of power amplifier linearization, and particularly relates to a novel digital and analog mixed predistortion structure for a mixed beam forming MIMO transmitter.
Background
With the change of the era, wireless communication technology has now entered the fifth generation of high-speed development. Due to the improvement of communication rate and the requirement of improving the utilization rate of frequency spectrum, the modulation mode with high utilization rate of frequency band used at present often has the characteristic of high peak-to-average ratio, and can bring a challenge to the balance between efficiency and linearity. The power amplifier, which is a key device in a communication link, has a non-linear characteristic that adversely affects the performance of the communication system, which requires a higher linearity of the output of the power amplifier.
Many power amplifier linearization techniques are proposed, such as: feed forward techniques, negative feedback techniques, predistortion techniques, etc. Predistortion techniques are further classified 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 requirements on a digital-to-analog converter required by a broadband signal and the like. The 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 the power amplifier.
Therefore, in a multiple-input multiple-output (MIMO) transmitter, we generally adopt a digital-analog hybrid predistortion scheme to solve the above problem. Since the multiple power amplifiers do not always use the same device, and the Digital Predistorter (DPD) module needs to be designed separately according to the characteristics of each power amplifier, a multiple predistortion scheme that one digital predistorter is matched with one analog predistorter is commonly used in a mimo transmitter at present, and n digital predistorters and n Analog Predistorters (APDs) are needed for n channels, so the implementation cost becomes the largest problem.
Therefore, how to balance the contradiction between the cost and the performance existing in the mimo transmitter becomes an urgent problem to be solved.
Disclosure of Invention
Aiming at the existing contradiction problem analyzed in the background technology, the invention aims to provide a novel digital-analog mixed predistortion structure for an MIMO transmitter. On the basis of a predistortion scheme adopted in a traditional multi-input multi-output transmitter, a plurality of analog predistorters are arranged behind a common digital predistorter, designed analog predistortion consistency detection and analog predistortion consistency adjustment are added, a feedback loop output by a power amplifier is compensated to the analog predistorter of each path, and the units are cascaded to form a digital-analog mixed predistortion structure, so that the novel digital-analog mixed predistortion structure for the MIMO transmitter with low cost and good linearization effect is realized.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a digital-to-analog hybrid predistortion architecture for a MIMO transmitter, comprising: the digital pre-coding unit, the digital predistorter, one or more way analog predistortion circuit, wherein analog predistortion circuit includes: D/A conversion, frequency mixing, an analog beam forming unit, a plurality of analog predistorters, a plurality of power amplifiers, a PA consistency adjusting unit and a PA consistency detecting unit; in the analog predistortion circuit, one analog predistorter corresponds to one power amplifier; the signal in the digital-analog mixed predistortion structure is output after sequentially 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, and the PA consistency detection unit is used for carrying out consistency detection on each path of Power Amplifier (PA), acquiring 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 adjusting unit is used for respectively outputting the results 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 the 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 corresponding analog predistortion circuits; the D/A conversion is used for converting the symbol digital stream obtained after the digital predistortion into an analog signal; the mixing is used for mixing the analog signals obtained in the front to a radio frequency band through a local oscillator; the analog beam forming unit is used for adjusting the phases of signals received and transmitted by the antenna through the phase shifter, dividing the processed signals into multiple paths and respectively outputting the multiple paths of the processed signals to the analog predistorters corresponding to the rear stages; the analog predistorter is used for carrying out analog predistortion processing on a preceding-stage signal and receiving a signal from the PA consistency adjusting unit.
In conclusion, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. based on the structure of the current MIMO transmitter, the linearization of the power amplifier is realized by using a mixed structure of digital predistortion and analog predistortion. Wherein the digital predistortion compensates for dynamic nonlinear distortion and the analog predistortion compensates for static nonlinear distortion.
2. The novel structure provided can realize the predistortion effect of the MIMO transmitter by only using one digital predistorter and a multi-path analog predistorter by adding the PA consistency detection unit and the PA consistency adjustment unit. The system implementation mode can be simplified, the cost can be reduced, and the size of the whole MIMO transmitter can be reduced.
Drawings
Fig. 1 is a block diagram of a novel digital-analog hybrid predistortion architecture for a MIMO transmitter with only a single analog beamforming unit.
Fig. 2 is a block diagram of a novel digital-analog hybrid predistortion architecture for a MIMO transmitter with n analog beamforming units.
Fig. 3 is a graph of predistortion effect for AM-AM (amplitude distortion of the input signal by the output signal) with consistent adjustment at different analog predistorter control voltages; fig. 3 includes 6 curves from left to right, in the order of PA2, PA1, ACV ═ 0.3v, ACV ═ 1.4v, ACV ═ 2.4v, and ACV ═ 3.5v, where PA1 is a white line.
Fig. 4 is a parametric comparison graph (with a center frequency of 3.5GHz) comparing the power spectral density with frequency of the original output signal of the power amplifier and the digital-analog hybrid predistortion structure without the structure of the invention, i.e. without the addition of the consistency detection and adjustment unit, and the digital-analog hybrid predistortion structure with the structure of the invention, i.e. with the addition of the consistency detection and adjustment unit.
Fig. 5 is a comparison graph (unit: dBm) of adjacent Channel Power ratio acpr (adjacent Channel Power ratio) parameters comparing a digital-to-analog hybrid predistortion structure using the present invention, i.e., with the addition of the consistency detection and adjustment unit, with a digital-to-analog hybrid predistortion structure not using the present invention, i.e., without the addition of the consistency detection and adjustment unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
A novel digital-analog mixed predistortion structure for an MIMO transmitter comprises a digital precoding unit, a digital predistorter, D/A conversion, frequency mixing, 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 using matrix processing to obtain a symbol stream, and minimizing the 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 to convert the symbol digital stream obtained after the digital pre-coding into an analog signal. The mixing is used for mixing the analog signals obtained in the foregoing to a radio frequency band through a local oscillator. The analog beam forming unit is used for adjusting the phases of signals received and transmitted by the antenna through the phase shifter, and dividing the processed signals into a plurality of paths to be respectively output to the analog predistorters corresponding to the later stages. The analog predistorter is used for carrying out analog predistortion processing on a preceding-stage signal and receiving a signal from the PA consistency adjusting unit. 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. And the PA consistency adjusting unit is used for respectively outputting the results obtained by the PA consistency detection to each path of analog predistorter.
Fig. 1 is a block diagram of a novel digital-analog hybrid predistortion architecture for a MIMO transmitter with only a single analog beamforming unit. The main function is to input the input baseband signal to the digital pre-distorter for digital pre-distortion treatment to compensate dynamic nonlinear distortion, then convert the digital signal after digital pre-distortion treatment to analog signal, adjust the phase of the antenna receiving and transmitting signal after the local oscillation frequency mixing to the radio frequency band, divide the treated signal into multiple paths to be output to the analog pre-distorter corresponding to the back stage, the analog pre-distorter receives the signal from the front stage and receives the signal from the PA consistency adjusting unit, finally the signal is 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 to input the input baseband signal to the digital pre-distorter for digital pre-distortion treatment to compensate dynamic nonlinear distortion, then convert the multi-channel digital signal after digital pre-distortion treatment to multi-channel analog signal, after the multi-channel analog signal is mixed to the radio frequency band by the local oscillator, adjust the phase of the antenna receiving and transmitting signal by the corresponding n analog beam forming units, divide the treated signal into multi-channels to be output to the analog pre-distorter corresponding to the back stage, the corresponding analog pre-distorter receives the signal from the front stage and receives the signal from the PA consistency adjusting unit, finally the signal is output to each PA.
Example 1
A new digital-analog mixed predistortion structure for MIMO transmitter, only have one way analog beam shaping unit, its structural block diagram is shown in fig. 1, mainly there are eight modules to form:
digital pre-coding: the main function is to utilize clutter Suppression interferometry (csi) (channel Suppression interference) to process the modulated symbol stream for the transmitted signal by using a precoding matrix at the transmitting end of the downlink, and input the symbol stream into the digital predistorter.
A digital predistorter: the power amplifier consists of a lookup table or a polynomial, and has the main function of reprocessing the signal processed by the precoding matrix to compensate the dynamic nonlinear distortion of the power amplifier and outputting the signal to D/A conversion.
D/A conversion: the digital-to-analog converter (DAC) is used for converting an output signal of the digital predistorter from digital to analog and outputting the converted signal to a mixing frequency.
Mixing: the device comprises a local oscillator and a mixer, and has the main function of mixing and moving analog signals output by D/A conversion to a radio frequency band and outputting the signals to an analog beam forming unit.
An analog beam forming 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 signal received and transmitted by the antenna is achieved, and the mixed output signal is output to n-path analog predistorters (APDs 0-APDn).
PA consistency detection unit: based on cross Normalized mean square error CNMSE (cross Normalized mean square error) algorithm, the method mainly has the functions of receiving feedback signals of n paths of power amplifiers (PA0-PAn) after n paths of analog predistorters, respectively carrying out consistency detection on each path, and outputting the signals to a PA consistency adjusting unit.
PA consistency adjusting unit: the method is based on a consistency adjustment algorithm, and the main function is to perform consistency compensation adjustment on n paths of analog predistorters (APD0-APDn) before n paths of different power amplifiers (PA 0-PAn). The main function is to compensate the inconsistency of the PA after n analog predistorters. And the output is sent to an n-path analog predistorter (APD 0-APDn).
The analog predistorter is composed of n paths (APD0-APDn), and mainly has the function of carrying out static nonlinear compensation on signals after the analog beam forming unit is subjected to phase adjustment, wherein the static nonlinear compensation comprises compensation for PA consistency adjustment. The signals compensated by the two are output to an n-path power amplifier PA (PA 0-PAn).
The final output signal can compensate the dynamic nonlinear distortion and the static nonlinear distortion of the power amplifier through theoretical analysis.
Example 2
A new digital-analog mixed predistortion structure for MIMO transmitter has n analog beam forming units, and its structural block diagram is shown in FIG. 2, mainly comprising eight modules:
digital pre-coding: the main function is to utilize clutter Suppression interferometry (csi) (channel Suppression interference) to process the modulated symbol stream for the transmitted signal by using a precoding matrix at the transmitting end of the downlink, and input the symbol stream into the digital predistorter.
A digital predistorter: the power amplifier consists of a lookup table or a polynomial, and has the main function of reprocessing the signal processed by the precoding matrix to compensate the dynamic nonlinear distortion of the power amplifier and outputting the signal to D/A conversion.
D/A conversion: the digital-to-analog converter (DAC) is used for converting an output signal of the digital predistorter from digital to analog and outputting the converted signal to a mixing frequency.
Mixing: the device comprises a local oscillator and a mixer, and has the main function of mixing and moving analog signals output by D/A conversion to a radio frequency band and outputting the signals to an analog beam forming unit.
An analog beam forming unit: the device comprises a phase shifter, a power divider and the like, and also comprises n paths of analog beam forming units. The main function is to adjust the phase of the mixed output signal through a phase shifter 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 (APDs 0-APDn).
PA consistency detection unit: based on cross Normalized mean square error CNMSE (cross Normalized mean square error) algorithm, the method mainly has the functions of receiving feedback signals of n paths of power amplifiers (PA0-PAn) after n paths of analog predistorters, respectively carrying out consistency detection on each path, and outputting the signals to a PA consistency adjusting unit.
The PA consistency adjusting unit is formed by a consistency adjusting algorithm, and mainly has the function of carrying out consistency compensation adjustment on n paths of analog predistorters (APD0-APDn) in front of n paths of different power amplifiers PA (PA 0-PAn). The main function is to compensate the inconsistency of the PA after n analog predistorters. And the output is sent to an n-path analog predistorter (APD 0-APDn).
The analog predistorter is composed of n paths (APD0-APDn), and mainly has the function of carrying out static nonlinear compensation on signals after the analog beam forming unit is subjected to phase adjustment, wherein the static nonlinear compensation comprises compensation for PA consistency adjustment. The signals compensated by the two are output to an n-path power amplifier PA (PA 0-PAn).
The final output signal can compensate the dynamic nonlinear distortion and the static nonlinear distortion of the power amplifier through theoretical analysis.
Fig. 3 is a diagram showing predistortion effects of AM-AM (amplitude distortion of the input signal by the output signal) that are adjusted consistently at different analog predistorter control voltages. The abscissa indicates the normalized input signal amplitude and the ordinate indicates the normalized output signal amplitude, and the diagram includes 6 curves from left to right, in the order of PA2, PA1, ACV of 0.3v, ACV of 1.4v, ACV of 2.4v, ACV of 3.5v, and PA1 as a white line. Wherein, the PA1 points to a thinner curve which is an amplitude distortion curve of the output signal of the power amplifier 1 without the consistency detection and adjustment unit added to the input signal, the PA2 points to a thicker curve which is an amplitude distortion curve of the output signal of the power amplifier 2 without the consistency detection and adjustment unit added to the input signal, the curve pointed to by ACV (APD Control Voltage) is an amplitude distortion curve of the output signal of the power amplifiers 1 and 2 to the input signal when the consistency adjustment Control Voltage is 0.3V after the consistency detection and adjustment unit is added to the curve, the curve pointed to by ACV 1.4 is an amplitude distortion curve of the output signal of the power amplifiers 1 and 2 to the input signal when the consistency adjustment Control Voltage is 1.4V after the consistency detection and adjustment unit is added to the curve pointed to by ACV 2.4 after the consistency detection and adjustment unit is added to the curve, the amplitude distortion curve of the output signal of the power amplifier 1 and 2 to the input signal when the consistency adjustment control voltage is 2.4V, and the curve pointed by ACV ═ 3.5 is the amplitude distortion curve of the output signal of the power amplifier 1 and 2 to the input signal when the consistency adjustment control voltage is 3.5V after the consistency detection and adjustment unit is added. It can be seen from the figure that the amplitude distortion curves of the output signals of the power amplifiers 1 and 2 to the input signal when the ACV is 0.3v, 1.4v, 2.4v, 3.5v are substantially similar to a straight line, which represents that the linearization effect is good, so that the digital-analog mixed predistortion structure added with the consistency detection and adjustment unit can better linearize the signal, thereby compensating the nonlinear distortion of the power amplifier, suppressing 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, a parameter comparison graph (center frequency of 3.5GHz) of power spectral density versus frequency of the original output signal of the power amplifier is compared with the digital-analog hybrid predistortion structure without the structure of the invention, i.e. without the addition of the consistency detection and adjustment unit, and the digital-analog hybrid predistortion structure with the structure of the invention, i.e. with the addition of the consistency detection and adjustment 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 to by PA1 origin shows the relation of the power spectral density of the Original output signal of the power amplifier 1 without the consistency detection and adjustment unit and the traditional digital-analog mixed predistortion structure, the curve pointed to by PA1 w A-DPD shows the relation of the power spectral density of the output signal of the power amplifier 1 without the consistency detection and adjustment unit and the traditional digital-analog mixed predistortion structure, the curve pointed to by PA1 w A shows the relation of the power spectral density of the output signal of the power amplifier 1 with the traditional digital-analog mixed predistortion structure, and the curve pointed to by PA1 origin shows the relation of the power spectral density of the2The curve pointed by the DPD indicates the relationship between the power spectral density of the output signal of the power amplifier 2 with the incorporated consistency detecting and adjusting unit and the digital-analog mixed predistortion structure as the frequency changes. Wherein the curve pointed to by PA2origin represents the power spectral density of the Original output signal of the power amplifier 2 without adding the consistency detection and adjustment unit and without using the traditional digital-analog mixed predistortion structure, the curve pointed to by PA2 w A-DPD represents the power spectral density of the output signal of the power amplifier 2 without adding the consistency detection and adjustment unit but using the traditional digital-analog mixed predistortion structure, the curve pointed to by PA2 w A2The curve pointed by the DPD indicates the relationship between the power spectral density of the output signal of the power amplifier 2 with the incorporated consistency detecting and adjusting unit and the digital-analog mixed predistortion structure as the frequency changes. Mixing PA1 origin with PA1 w A2Comparison of-DPD and PA1 w A-DPD curves shows that the novel digital-analog mixed predistortion structure added with the consistency detection and adjustment unit can obtain more than that without pre-additionThe distortion module and the traditional digital-analog mixed predistortion structure without the consistency detection and adjustment unit have better linearization effect. Mixing PA2origin with PA2 w A2Comparison of-DPD and PA2 w A-DPD curves shows that the new digital-analog hybrid predistortion structure with the consistency detection and adjustment unit can achieve better linearization effect than the traditional digital-analog hybrid predistortion structure without the predistortion module and the consistency detection and adjustment unit. The results of the specific measurement parameters are shown in FIG. 5.
As shown in fig. 5, the adjacent Channel Power ratio acpr (adjacent Channel Power ratio) parameter comparison graph (unit: dBm) is compared between the digital-analog hybrid predistortion structure with the consistency detection and adjustment unit and the digital-analog hybrid predistortion structure without the consistency detection and adjustment unit. The first row in fig. 4 represents Alt lower (data with the next adjacent channel power being worst than the lowest), Adj lower (data with the adjacent channel power being worst than the lowest), Adj higher (data with the adjacent channel power being worst than the highest), and Alt higher (data with the adjacent channel power being worst than the lowest), respectively. The second row shows that the data of the following three rows are all the result of the data indexes of the power amplifier 1, such as altower, Adj lower, Adj higher and Alt higher. The third row shows the result of the data indexes of the original output signal (PAOriginal) of the power amplifier 1 without adding a consistency detection and adjustment unit and without using the traditional digital-analog mixed predistortion structure, such as the data indexes of the Alt lower, Adj highher and Alt highher. The fourth row represents the data index results of all lower, Adj higher, all higher of the output signal of the (With a-DPD) power amplifier 1 without the addition of the consistency detection and adjustment unit but using the conventional digital-analog hybrid predistortion structure. The fifth row shows the digital-analog hybrid predistortion architecture With the consistency detection and adjustment unit added (With A)2DPD) of the output signal of the power amplifier 1. The sixth row shows that the data of the next three rows are all the index results of the data of all lower, Adj higher and all higher of the power amplifier 2. The seventh row shows that no consistency detection and adjustment unit is added nor usedThe result of the data indexes of the Original output signal (PA Original) of the power amplifier 2 with the unified digital-analog mixed predistortion structure, such as the Alt lower, the Adj highher and the Althigher, is obtained. The eighth row shows the result of the data indexes of the (With a-DPD) power amplifier 2 output signal, such as the Alt lower, Adj highher and Alt highher, without adding a consistency detection and adjustment unit but using the conventional digital-analog hybrid predistortion structure. The ninth row shows the digital-analog mixed predistortion structure With consistency detection and adjustment unit added (With A)2DPD) of the output signal of the power amplifier 2.
From the table of fig. 5, it can be seen that the Original signal (PA Original) of the power amplifier 1 is combined With the conventional digital-to-analog hybrid predistortion structure (With a-DPD) and the novel digital-to-analog hybrid predistortion structure (With a-DPD) using the present invention2-DPD), wherein after passing through a traditional digital-analog mixed predistortion structure, PA1 respectively reaches-59.6 dBm, -47.9dBm, -47.1dBm and-60.0 dBm, respectively improves 12.9dBm, 17.6dBm, 17.0dBm and 12.2dBm, and PA1 respectively reaches-59.6 dBm, -47.9dBm, -47.1dBm and-60.0 dBm after passing through the novel digital-analog mixed predistortion structure, respectively improves 12.3dBm, 20.7dBm, 21.5dBm and 12.7 dBm. Mixing the original signal (PAOriginal) of the power amplifier 2 With the traditional digital-analog mixed predistortion structure (With A-DPD) and the novel digital-analog mixed predistortion structure (With A-DPD) using the invention2-DPD), wherein after passing through a traditional digital-analog mixed predistortion structure, PA2 respectively reaches-58.7 dBm, -48.1dBm, -48.0dBm and-59.2 dBm, respectively improves 9.9dBm, 18.4dBm, 17.8dBm and 9.4dBm, and PA1 respectively reaches-50.4 dBm, -51.1dBm, -52.6dBm and-58.3 dBm, respectively improves 1.6dBm, 21.4dBm, 22.4dBm and 8.5dBm after passing through the novel digital-analog mixed predistortion structure. Parameter comparison shows that compared with the traditional digital-analog mixed predistortion structure, the invention can have the predistortion effect of the power amplifier with the same level.
Claims (1)
1. A digital-to-analog hybrid predistortion architecture for a MIMO transmitter, comprising: the digital pre-coding unit, the digital predistorter, one or more way analog predistortion circuit, wherein analog predistortion circuit includes: D/A conversion, frequency mixing, an analog beam forming unit, a plurality of analog predistorters, a plurality of power amplifiers, a PA consistency adjusting unit and a PA consistency detecting unit; in the analog predistortion circuit, one analog predistorter corresponds to one power amplifier; signals in the digital-analog mixed predistortion structure are 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, and a PA consistency detection unit is used for carrying out consistency detection on each path of power amplifier, acquiring a feedback signal from each path of power amplifier, processing the feedback signal and outputting the processed feedback signal to a PA consistency adjustment unit; the PA consistency adjusting unit is used for respectively outputting the results 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 the 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 corresponding analog predistortion circuits; the D/A conversion is used for converting the symbol digital stream obtained after the digital predistortion into an analog signal; the mixing is used for mixing the analog signals obtained in the front to a radio frequency band through a local oscillator; the analog beam forming unit is used for adjusting the phases of signals received and transmitted by the antenna through the phase shifter, dividing the processed signals into multiple paths and respectively outputting the multiple paths of the processed signals to the analog predistorters corresponding to the rear stages; the analog predistorter is used for carrying out analog predistortion processing on a preceding-stage signal and receiving a signal from the PA consistency adjusting unit.
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| CN113131976A (en) * | 2021-03-11 | 2021-07-16 | 西安电子科技大学 | Decimetric wave mixed beam forming method, system and application |
| CN114338312A (en) * | 2020-10-09 | 2022-04-12 | 意法半导体股份有限公司 | Apparatus and method for linearizing a transmission signal |
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