WO2019085555A1 - 超宽带数字预失真方法、装置和*** - Google Patents
超宽带数字预失真方法、装置和*** Download PDFInfo
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- WO2019085555A1 WO2019085555A1 PCT/CN2018/097584 CN2018097584W WO2019085555A1 WO 2019085555 A1 WO2019085555 A1 WO 2019085555A1 CN 2018097584 W CN2018097584 W CN 2018097584W WO 2019085555 A1 WO2019085555 A1 WO 2019085555A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3258—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits based on polynomial terms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/71635—Transmitter aspects
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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
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- the present invention relates to the field of signal processing technologies for wireless communications, and in particular, to an ultra-wideband digital predistortion method, apparatus and system.
- wireless communication equipment With the increasing traffic of data services, wireless communication equipment is required to operate in a wider working frequency band to ensure a higher wireless communication rate.
- the latest wireless communication equipment has an instantaneous working bandwidth exceeding 200 MHz, which places high demands on power amplifiers, but Existing power amplifiers are difficult to guarantee good linearity in the ultra-wideband frequency range, while the traditional digital predistortion method has a poor nonlinear correction effect on ultra-wideband power amplifiers.
- An ultra-wideband digital predistortion method comprising the following steps:
- the frequency domain reconstruction is performed on each sub-band in turn, and the input signals of the power amplifier after frequency domain reconstruction are respectively corresponding to the input reconstructed signals in each sub-band, and the output feedback signals of the power amplifier after frequency domain reconstruction are respectively calculated.
- the baseband sub-signals of the corresponding sub-bands are pre-distorted according to the pre-distortion coefficients of the respective sub-bands.
- An ultra-wideband digital predistortion device comprising:
- a subband division module configured to divide the effective bandwidth into a plurality of subbands according to an amplitude frequency response within an effective bandwidth of the power amplifier
- the predistortion coefficient calculation module is configured to perform frequency domain reconstruction on each subband in turn, respectively calculate an input signal of the power amplifier corresponding to the input reconstructed signal in each subband after frequency domain reconstruction, and respectively calculate frequency domain reconstruction
- the output feedback signal of the post power amplifier corresponds to the output feedback reconstructed signal in each subband, and the predistortion coefficients of the respective subbands are respectively calculated according to the input reconstructed signal and the output feedback reconstructed signal;
- the predistortion processing module is configured to perform predistortion processing on the baseband sub-signals of the corresponding sub-bands according to the pre-distortion coefficients of the respective sub-bands.
- An ultra-wideband digital predistortion system comprising:
- a predistortion processing unit a data acquisition unit, a subband division unit, and a predistortion coefficient calculation unit;
- the data acquisition unit acquires an input signal of each sub-band of the power amplifier and an output feedback signal of each sub-band;
- the subband dividing unit sequentially performs frequency domain reconstruction on each subband, and respectively calculates an input signal of the power amplifier corresponding to the input reconstructed signal in each subband after frequency domain reconstruction, and separately calculates power in the frequency domain reconstruction.
- the output feedback signal of the amplifier corresponds to the output feedback reconstruction signal in each sub-band;
- the pre-distortion coefficient calculation unit respectively calculates pre-distortion coefficients of the respective sub-bands according to the input reconstruction signal and the output feedback reconstruction signal;
- the predistortion processing unit performs predistortion processing on the baseband sub-signals of the corresponding sub-bands according to the pre-distortion coefficients of the respective sub-bands.
- the above ultra-wideband digital predistortion method, device and system divide subbands according to frequency response, separate subbands and predistort each subband separately, which can effectively improve the nonlinear correction effect on the ultra-wideband power amplifier, thereby improving the super Wideband digital predistortion performance.
- 1 is a flow chart of an ultra-wideband digital pre-distortion method of an embodiment
- FIG. 2 is a schematic diagram of dividing a subband within an effective bandwidth according to a frequency response characteristic value according to an embodiment
- FIG. 3 is a block diagram showing the structure of an ultra-wideband digital predistortion apparatus according to an embodiment
- FIG. 4 is a schematic diagram of the connection of an ultra-wideband digital pre-distortion system of one embodiment in one embodiment.
- the present invention provides an ultra-wideband digital predistortion method, which may include the following steps:
- the effective bandwidth of the power amplifier is the working frequency band of the power amplifier.
- the power amplifier only processes the data in the working frequency band to ensure the accuracy of the predistortion processing. Assuming that the effective bandwidth of a power amplifier is 1.8 GHz to 2 GHz, signals outside this range cannot be amplified normally.
- N is the number of points at which the signal is acquired, is a constant, and n is a variable.
- the meaning of such expression in the following embodiments is similar, and will not be further described in the following embodiments.
- the amplitude-frequency response within the effective bandwidth of the power amplifier can then be calculated from the effective bandwidth of X(k), Y(k), and the power amplifier. Further, the frequency domain sampling point offset k_off and the frequency domain sampling point number K_in may be calculated according to the effective bandwidth; the frequency domain sampling point offset k_off is taken as the starting point, and the frequency domain sampling point number K_in is the length, and the effective bandwidth is obtained.
- Frequency domain index k calculating an amplitude frequency within an effective bandwidth of the power amplifier according to a frequency domain form X(k) of the input signal, a frequency domain form Y(k) of the output feedback signal, and the frequency domain index k response.
- the resulting amplitude-frequency response within the effective bandwidth can be written as:
- the amplitude average of the amplitude frequency response in the effective bandwidth may be counted; the effective bandwidth is divided into several first level subbands according to the amplitude mean; The phase averages of the phase-frequency responses of the power amplifiers are separately calculated in the band; the corresponding first-order sub-bands are respectively divided into several sub-bands according to the phase mean values corresponding to the respective first-level sub-bands.
- the amplitude of the amplitude-frequency response of each frequency sampling point in the effective bandwidth may be separately calculated; and the difference between the obtained amplitude and the first amplitude average is less than the preset difference a target frequency sampling point; dividing a first target frequency sampling point whose frequency interval is less than a preset interval into an area; determining a second target frequency sampling point closest to a center of gravity of the area; sampling points according to the second target frequency
- the effective bandwidth is divided into a number of primary subbands.
- the secondary sub-bands can be divided in a similar manner, and will not be described here. Firstly, according to the amplitude-frequency response division, and then according to the phase-frequency response division, more precise subdivision, to ensure that the sub-band power amplifier features are consistent.
- the subband division process will be described below with a specific example.
- calculate the amplitude mean A of H_in find the point of the mean line ⁇ A, and classify the point whose frequency interval is smaller than ⁇ F into one area, as shown in area A1 and area A2 in Fig. 2, respectively.
- the points closest to the center of gravity of the region, as shown in Fig. 2 are points 58 and 165, denoted as f_A1 and f_A2, respectively, and H_in is divided into three first-level sub-bands by f_A1 and f_A2, respectively.
- the second-order sub-band is divided according to the phase-frequency response in the same way.
- the portion of the input signal other than the sub-band may be zeroed to obtain an input reconstructed signal corresponding to the input signal in each sub-band.
- the output feedback signal when the output feedback signal is reconstructed, the output feedback signal may be zeroed in a portion other than the extended sub-band corresponding to the sub-band, so that the output feedback signal is corresponding to each sub-band.
- the output feedback reconstructs the signal; wherein the extended subband is a frequency band in which the subband and its adjacent frequency bands are combined. Wherein the frequency band adjacent to the sub-band includes a higher frequency band and a lower frequency band adjacent to the sub-band.
- the number of frequency domain points of the extended subband is three times that of the extended subband, and C1 is equal to the number of points of k_in1.
- the time domain form of the input reconstructed signal and the time domain form of the output feedback reconstructed signal may be calculated. That is, performing an IFFT transform (Inverse Fast Fourier Transform) on the input reconstructed signal and the output feedback reconstructed signal, and then reconstructing the time domain of the signal according to the time domain form of the input reconstructed signal and the output feedback. The form calculates the predistortion coefficient.
- IFFT transform Inverse Fast Fourier Transform
- IFFT is converted to x_1 (X_1(k), Y_1(k), X_2(k), Y_2(k),..., X_6(k), Y_6(k), respectively.
- n y_1(n), x_2(n), y_2(n), ..., x_6(n), y_6(n).
- the predistortion coefficient c_i of the subband power amplifier model is fitted by y_i and x_i.
- c_i) obtains the time domain form of the subband of the predistorted input signal x_i'.
- each baseband sub-signal after the pre-distortion processing may be subjected to a summation process to obtain an input signal after pre-distortion processing;
- the input signal after the predistortion processing is output to the signal input terminal of the power amplifier.
- the previous example is continued by summing the different sub-band dimensions of x_1'(n),...,x_6'(n) to obtain x'(n), which is output to the power amplifier.
- the above ultra-wideband digital predistortion method divides subbands according to frequency response, separates subbands and predistorts each subband separately, can effectively improve nonlinear correction effect on ultra-wideband power amplifier, thereby improving ultra-wideband digital predistortion Performance.
- the present invention further provides an ultra-wideband digital predistortion apparatus, which may include:
- the subband division module 110 is configured to divide the effective bandwidth into a plurality of subbands according to an amplitude frequency response within an effective bandwidth of the power amplifier;
- N is the number of points at which the signal is acquired, is a constant, and n is a variable.
- the meaning of such expression in the following embodiments is similar, and will not be further described in the following embodiments.
- the amplitude-frequency response within the effective bandwidth of the power amplifier can then be calculated from the effective bandwidth of X(k), Y(k), and the power amplifier. Further, the frequency domain sampling point offset k_off and the frequency domain sampling point number K_in may be calculated according to the effective bandwidth; the frequency domain sampling point offset k_off is taken as the starting point, and the frequency domain sampling point number K_in is the length, and the effective bandwidth is obtained.
- Frequency domain index k calculating an amplitude frequency within an effective bandwidth of the power amplifier according to a frequency domain form X(k) of the input signal, a frequency domain form Y(k) of the output feedback signal, and the frequency domain index k response.
- the resulting amplitude-frequency response within the effective bandwidth can be written as:
- the amplitude average of the amplitude frequency response in the effective bandwidth may be counted; the effective bandwidth is divided into several first level subbands according to the amplitude mean; The phase averages of the phase-frequency responses of the power amplifiers are separately calculated in the band; the corresponding first-order sub-bands are respectively divided into several sub-bands according to the phase mean values corresponding to the respective first-level sub-bands.
- the amplitude of the amplitude-frequency response of each frequency sampling point in the effective bandwidth may be separately calculated; and the difference between the obtained amplitude and the first amplitude average is less than the preset difference a target frequency sampling point; dividing a first target frequency sampling point whose frequency interval is less than a preset interval into an area; determining a second target frequency sampling point closest to a center of gravity of the area; sampling points according to the second target frequency
- the effective bandwidth is divided into a number of primary subbands.
- the secondary sub-bands can be divided in a similar manner, and will not be described here. Firstly, according to the amplitude-frequency response division, and then according to the phase-frequency response division, more precise subdivision, to ensure that the sub-band power amplifier features are consistent.
- the subband division process will be described below with a specific example.
- calculate the amplitude mean A of H_in find the point of the mean line ⁇ A, and classify the point whose frequency interval is smaller than ⁇ F into one area, as shown in area A1 and area A2 in Fig. 2, respectively.
- the points closest to the center of gravity of the region, as shown in Fig. 2 are points 58 and 165, denoted as f_A1 and f_A2, respectively, and H_in is divided into three first-level sub-bands by f_A1 and f_A2, respectively.
- the second-order sub-band is divided according to the phase-frequency response in the same way.
- the pre-distortion coefficient calculation module 120 is configured to perform frequency domain reconstruction on each sub-band in turn, respectively calculate an input signal of the power amplifier corresponding to the input reconstructed signal in each sub-band after frequency domain reconstruction, and calculate a frequency domain weight respectively.
- the output feedback signal of the post-construction power amplifier corresponds to the output feedback reconstructed signal in each sub-band, and the pre-distortion coefficients of the respective sub-bands are respectively calculated according to the input reconstructed signal and the output feedback reconstructed signal;
- the portion of the input signal other than the sub-band may be zeroed to obtain an input reconstructed signal corresponding to the input signal in each sub-band.
- the output feedback signal when the output feedback signal is reconstructed, the output feedback signal may be zeroed in a portion other than the extended sub-band corresponding to the sub-band, so that the output feedback signal is corresponding to each sub-band.
- the output feedback reconstructs the signal; wherein the extended subband is a frequency band in which the subband and its adjacent frequency bands are combined. Wherein the frequency band adjacent to the sub-band includes a higher frequency band and a lower frequency band adjacent to the sub-band.
- the number of frequency domain points of the extended subband is three times that of the extended subband, and C1 is equal to the number of points of k_in1.
- the time domain form of the input reconstructed signal and the time domain form of the output feedback reconstructed signal may be calculated. That is, performing an IFFT transform (Inverse Fast Fourier Transform) on the input reconstructed signal and the output feedback reconstructed signal, and then reconstructing the time domain of the signal according to the time domain form of the input reconstructed signal and the output feedback. The form calculates the predistortion coefficient.
- IFFT transform Inverse Fast Fourier Transform
- IFFT is converted to x_1 (X_1(k), Y_1(k), X_2(k), Y_2(k),..., X_6(k), Y_6(k), respectively.
- n y_1(n), x_2(n), y_2(n), ..., x_6(n), y_6(n).
- the predistortion coefficient c_i of the subband power amplifier model is fitted by y_i and x_i.
- the predistortion processing module 130 is configured to perform predistortion processing on the baseband sub-signals of the corresponding sub-bands according to the pre-distortion coefficients of the respective sub-bands.
- c_i) obtains the time domain form of the subband of the predistorted input signal x_i'.
- each baseband sub-signal after the pre-distortion processing may be subjected to a summation process to obtain an input signal after pre-distortion processing;
- the input signal after the predistortion processing is output to the signal input terminal of the power amplifier.
- the previous example is continued by summing the different sub-band dimensions of x_1'(n),...,x_6'(n) to obtain x'(n), which is output to the power amplifier.
- the ultra-wideband digital predistortion device divides the subband according to the frequency response, separates the subbands and separately predistorts the subbands, thereby effectively improving the nonlinear correction effect on the ultra-wideband power amplifier, thereby improving the ultra-wideband digital predistortion. Performance.
- the ultra-wideband digital predistortion device of the present invention has a one-to-one correspondence with the ultra-wideband digital predistortion method of the present invention, and the technical features and beneficial effects described in the embodiments of the ultra-wideband digital predistortion method are applicable to ultra-wideband digital predistortion. In the embodiment of the device, it is hereby declared.
- the present invention further provides an ultra-wideband digital predistortion system, which may include:
- Predistortion processing unit 210 data acquisition unit 220, subband division unit 230 and predistortion coefficient calculation unit 240;
- the data collection unit 220 acquires an input signal of each sub-band of the power amplifier and an output feedback signal of each sub-band;
- the subband dividing unit 230 sequentially performs frequency domain reconstruction on each subband, and respectively calculates an input signal of the power amplifier corresponding to the input reconstructed signal in each subband after the frequency domain reconstruction, and respectively calculates the frequency domain reconstruction.
- the output feedback signal of the power amplifier corresponds to the output feedback reconstruction signal in each sub-band;
- the pre-distortion coefficient calculation unit 240 respectively calculates pre-distortion coefficients of the respective sub-bands according to the input reconstruction signal and the output feedback reconstruction signal;
- the predistortion processing unit 210 performs predistortion processing on the baseband sub-signals of the corresponding sub-bands according to the pre-distortion coefficients of the respective sub-bands.
- the effective bandwidth of the power amplifier is the working frequency band of the power amplifier.
- the power amplifier only processes the data in the working frequency band to ensure the accuracy of the predistortion processing. Assuming that the effective bandwidth of a power amplifier is 1.8 GHz to 2 GHz, signals outside this range cannot be amplified normally.
- N is the number of points at which the signal is acquired, is a constant, and n is a variable.
- the amplitude-frequency response within the effective bandwidth of the power amplifier can then be calculated from the effective bandwidth of X(k), Y(k), and the power amplifier. Further, the frequency domain sampling point offset k_off and the frequency domain sampling point number K_in may be calculated according to the effective bandwidth; the frequency domain sampling point offset k_off is taken as the starting point, and the frequency domain sampling point number K_in is the length, and the effective bandwidth is obtained.
- Frequency domain index k calculating an amplitude frequency within an effective bandwidth of the power amplifier according to a frequency domain form X(k) of the input signal, a frequency domain form Y(k) of the output feedback signal, and the frequency domain index k response.
- the resulting amplitude-frequency response within the effective bandwidth can be written as:
- the above operation may be performed in advance, and after obtaining the amplitude-frequency response in the effective bandwidth of the power amplifier, the amplitude-frequency response in the effective bandwidth may be pre-stored to the splitter 220 for performing subsequent operations.
- the amplitude average of the amplitude frequency response in the effective bandwidth may be counted; the effective bandwidth is divided into several first level subbands according to the amplitude mean; The phase averages of the phase-frequency responses of the power amplifiers are separately calculated in the band; the corresponding first-order sub-bands are respectively divided into several sub-bands according to the phase mean values corresponding to the respective first-level sub-bands.
- the amplitude of the amplitude-frequency response of each frequency sampling point in the effective bandwidth may be separately calculated; and the difference between the obtained amplitude and the first amplitude average is less than the preset difference a target frequency sampling point; dividing a first target frequency sampling point whose frequency interval is less than a preset interval into an area; determining a second target frequency sampling point closest to a center of gravity of the area; sampling points according to the second target frequency
- the effective bandwidth is divided into a number of primary subbands.
- the secondary sub-bands can be divided in a similar manner, and will not be described here. Firstly, according to the amplitude-frequency response division, and then according to the phase-frequency response division, more precise subdivision, to ensure that the sub-band power amplifier features are consistent.
- the subband division process will be described below with a specific example.
- calculate the amplitude mean A of H_in find the point of the mean line ⁇ A, and classify the point whose frequency interval is smaller than ⁇ F into one area, as shown in area A1 and area A2 in Fig. 2, respectively.
- the points closest to the center of gravity of the region, as shown in Fig. 2 are points 58 and 165, denoted as f_A1 and f_A2, respectively, and H_in is divided into three first-level sub-bands by f_A1 and f_A2, respectively.
- the second-order sub-band is divided according to the phase-frequency response in the same way.
- the input signal when the data processing unit 240 performs the input signal reconstruction, the input signal may be zeroed in a portion other than the sub-band, and the input signal corresponding to the input reconstructed signal in each sub-band is obtained. .
- the output feedback signal when the output feedback signal is reconstructed, the output feedback signal may be zeroed in a portion other than the extended sub-band corresponding to the sub-band, so that the output feedback signal is corresponding to each sub-band.
- the output feedback reconstructs the signal; wherein the extended subband is a frequency band in which the subband and its adjacent frequency bands are combined. Wherein the frequency band adjacent to the sub-band includes a higher frequency band and a lower frequency band adjacent to the sub-band.
- the number of frequency domain points of the extended subband is three times that of the extended subband, and C1 is equal to the number of points of k_in1.
- the time domain form of the input reconstructed signal and the time domain form of the output feedback reconstructed signal may be calculated. That is, performing an IFFT transform (Inverse Fast Fourier Transform) on the input reconstructed signal and the output feedback reconstructed signal, and then reconstructing the time domain of the signal according to the time domain form of the input reconstructed signal and the output feedback. The form calculates the predistortion coefficient.
- IFFT transform Inverse Fast Fourier Transform
- IFFT is converted to x_1 (X_1(k), Y_1(k), X_2(k), Y_2(k),..., X_6(k), Y_6(k), respectively.
- n y_1(n), x_2(n), y_2(n), ..., x_6(n), y_6(n).
- the predistortion coefficient c_i of the subband power amplifier model is fitted by y_i and x_i.
- c_i) obtains the time domain form of the subband of the predistorted input signal x_i'.
- the ultra-wideband digital pre-distortion system of the present invention may further comprise a combiner; the combiner performs a summation process on each of the baseband sub-signals after the pre-distortion processing to obtain a pre-distorted input. And outputting the predistortion processed input signal to a signal input end of the power amplifier.
- the previous example is continued by summing the different sub-band dimensions of x_1'(n),...,x_6'(n) to obtain x'(n), which is output to the power amplifier.
- the above ultra-wideband digital predistortion system divides subbands according to frequency response, separates subbands and separately predistorts each subband, which can effectively improve the nonlinear correction effect on the ultra-wideband power amplifier, thereby improving the ultra-wideband digital predistortion. Performance.
- a "computer-readable medium” can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with such an instruction execution system, apparatus, or device.
- computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
- the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.
- portions of the invention may be implemented in hardware, software, firmware or a combination thereof.
- multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
- a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
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Abstract
Description
Claims (10)
- 一种超宽带数字预失真方法,其特征在于,包括以下步骤:根据功率放大器有效带宽内的幅频响应将所述有效带宽划分为若干个子带;依次对各个子带进行频域重构,分别计算频域重构后功率放大器的输入信号对应在各个子带内的输入重构信号,并分别计算频域重构后功率放大器的输出反馈信号对应在各个子带内的输出反馈重构信号,根据所述输入重构信号和输出反馈重构信号分别计算各个子带的预失真系数;分别根据各个子带的预失真系数对对应子带的基带子信号进行预失真处理。
- 根据权利要求1所述的超宽带数字预失真方法,其特征在于,在分别根据各个子带的预失真系数对对应子带的基带子信号进行预失真处理之后,还包括以下步骤:对预失真处理后的各个基带子信号进行求和处理,得到预失真处理后的输入信号;将所述预失真处理后的输入信号输出至所述功率放大器的信号输入端。
- 根据权利要求1所述的超宽带数字预失真方法,其特征在于,在根据功率放大器有效带宽内的幅频响应将所述有效带宽划分为若干个子带之前,还包括以下步骤:计算所述输入信号的频域形式和所述输出反馈信号的频域形式;根据所述输入信号的频域形式、所述输出反馈信号的频域形式和所述功率放大器的有效带宽计算所述功率放大器有效带宽内的幅频响应。
- 根据权利要求3所述的超宽带数字预失真方法,其特征在于,根据所述输入信号的频域形式、所述输出反馈信号的频域形式和所述功率放大器的有效带宽计算所述功率放大器有效带宽内的幅频响应的步骤包括:根据所述有效带宽计算频域采样点偏置和频域采样点个数;以频域采样点偏置为起始点,频域采样点个数为长度,得到有效带宽的频域索引;根据所述输入信号的频域形式、所述输出反馈信号的频域形式和所述频域索引计算所述功率放大器有效带宽内的幅频响应。
- 根据权利要求1所述的超宽带数字预失真方法,其特征在于,根据功率放大器有效带宽内的幅频响应将所述有效带宽划分为若干个子带的步骤包括:统计所述有效带宽内所述幅频响应的幅度均值;根据幅度均值将所述有效带宽划分为若干个一级子带;在各个一级子带内分别统计功率放大器的相频响应的相位均值;根据各个一级子带对应的相位均值分别将对应的一级子带划分为若干个子带。
- 根据权利要求5所述的超宽带数字预失真方法,其特征在于,根据第一幅度均值将所述有效带宽划分为若干个一级子带的步骤包括:分别计算所述有效带宽内各个频率采样点的幅频响应的幅值;获取幅值与所述第一幅度均值之差小于预设差值的第一目标频率采样点;将频率间隔小于预设间隔的第一目标频率采样点划分为一个区域;确定最接近所述区域的重心的第二目标频率采样点;根据所述第二目标频率采样点将所述有效带宽划分为若干个一级子带。
- 根据权利要求1所述的超宽带数字预失真方法,其特征在于,分别计算频域重构后功率放大器的输入信号对应在各个子带内的输入重构信号的步骤包括:将所述输入信号在所述子带以外的部分置零,得到所述输入信号对应在各个子带内的输入重构信号;和/或分别计算频域重构后功率放大器的输出反馈信号对应在各个子带内的输出反馈重构信号的步骤包括:将所述输出反馈信号在所述子带对应的扩展子带以外的部分置零,得到所述输出反馈信号对应在各个子带内的输出反馈重构信号;其中,所述扩展子带为所述子带及其相邻的频带合并而成的频带。
- 一种超宽带数字预失真装置,其特征在于,包括:子带划分模块,用于根据功率放大器有效带宽内的幅频响应将所述有效带宽划分为若干个子带;预失真系数计算模块,用于依次对各个子带进行频域重构,分别计算频域重构后功率放大器的输入信号对应在各个子带内的输入重构信号,并分别计算频域重构后功率放大器的输出反馈信号对应在各个子带内的输出反馈重构信号,根据所述输入重构信号和输出反馈重构信号分别计算各个子带的预失真系数;预失真处理模块,用于分别根据各个子带的预失真系数对对应子带的基带子信号进行预失真处理。
- 一种超宽带数字预失真***,其特征在于,包括:预失真处理单元,数据采集单元,子带划分单元和预失真系数计算单元;所述数据采集单元采集功率放大器各个子带的输入信号和各个子带的输出反馈信号;所述子带划分单元依次对各个子带进行频域重构,分别计算频域重构后功率放大器的输入信号对应在各个子带内的输入重构信号,并分别计算频域重构后功率放大器的输出反馈信号对应在各个子带内的输出反馈重构信号;所述预失真系数计算单元根据所述输入重构信号和输出反馈重构信号分别计算各个子带的预失真系数;所述预失真处理单元分别根据各个子带的预失真系数对对应子带的基带子信号进行预失真处理。
- 根据权利要求9所述的超宽带数字预失真***,其特征在于,所述预失真处理单元还对预失真处理后的各个基带子信号进行求和处理,得到预失真处理后的输入信号,并将所述预失真处理后的输入信号输出至所述功率放大器的信号输入端。
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