Memory effect compensation-based analog pre-distortion system
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A memory effect and pre-distortion technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of unable to compensate memory effect, low pre-distortion accuracy, high cost, etc.
Active Publication Date: 2018-04-06
NINGBO UNIV
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The digital predistortion system is mainly realized by high sampling rate ADC, FPGA, digital predistorter and digital signal processor. The cost is high, and the predistortion processing algorithm stored in the digital signal processor is relatively complicated. Putting heavy pressure on the throughput and computing speed of FPGAs and digital signal processors, digital predistortion systems are no longer applicable in the mmWave frequency band
The analog predistortion system is only realized through the traditional analog predistorter. The operator can adjust the control voltage of the analog predistorter to realize the adjustment of the predistortion parameters by observing the signal at the output terminal of the predistorted power amplifier. Its structure is simple and the price is low. It can be used in the millimeter wave frequency band, but the traditional analog predistorter cannot compensate the memory effect of the power amplifier, and the predistortion accuracy is not high
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Embodiment 1
[0012] Embodiment one: if figure 1 As shown, an analog predistortion system based on compensating memory effects includes an analog predistorter 1, and the analog predistortion system also includes n+2 delay lines, n vector modulators, a first combiner P1, a second Combiner P2, down converter 2, envelope detector 3, analog-to-digital converter 4 and single-chip microcomputer 5, n is an integer greater than or equal to 2; the delay time of the first delay line is τ L , the delay time of the jth delay line is (j-1)*τ x , j=2, 3,..., n+2, τ L =τ x +τ,B wis the signal bandwidth at the input end of the analog predistorter 1, τ is the delay parameter of the analog predistorter 1, and is a known parameter of the analog predistorter 1, and the symbol "*" is a multiplication operator; the first combiner P1 has the first An input terminal, a second input terminal and an output terminal, the second combiner P2 has n input terminals and an output terminal, and the vector modulator h...
Embodiment 2
[0014] Embodiment two: if figure 1 As shown, an analog predistortion system based on compensating memory effects includes an analog predistorter 1, and the analog predistortion system also includes n+2 delay lines, n vector modulators, a first combiner P1, a second Combiner P2, down converter 2, envelope detector 3, analog-to-digital converter 4 and single-chip microcomputer 5, n is an integer greater than or equal to 2; the delay time of the first delay line is τ L , the delay time of the jth delay line is (j-1)*τ x , j=2, 3,..., n+2, τ L =τ x +τ,B w is the signal bandwidth at the input end of the analog predistorter 1, τ is the delay parameter of the analog predistorter 1, and is a known parameter of the analog predistorter 1, and the symbol "*" is a multiplication operator; the first combiner P1 has the first An input terminal, a second input terminal and an output terminal, the second combiner P2 has n input terminals and an output terminal, and the vector modulator ...
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Abstract
The invention discloses a memory effect compensation-based analog pre-distortion system. The system comprises an analog pre-distorter, n+2 delay lines, n vector modulators, a first combiner, a secondcombiner, a down converter, an envelope detector, an analog-digital converter and a single-chip microcomputer, wherein the single-chip microcomputer stores reference ranges of nonlinear outputs of multiple power amplifiers and optimal control voltage values of the n vector modulators corresponding to the reference ranges of the nonlinear outputs of the power amplifiers; and after the single-chip microcomputer receives a signal sent by the analog-digital converter, the reference range of the nonlinear output of the power amplifier corresponding to the signal is judged, then the corresponding optimal control voltage values of the n vector modulators are selected according to a judgment result, the control voltages of the n vector modulators are regulated, and the nonlinearity of the power amplifiers is subjected to adaptive pre-distortion regulation. The system has the advantages of simple structure, relatively low cost and high adaptability, can be used for memory effect compensation ofmillimeter wave band power amplifiers, and is relatively high in pre-distortion precision.
Description
technical field [0001] The invention relates to an analog predistortion system, in particular to an analog predistortion system based on compensating memory effects. Background technique [0002] Millimeter wave is an electromagnetic wave with a wavelength of 1-10 mm, its frequency range is 26.5-300 GHz, and it has an extremely wide bandwidth up to 273.5 GHz. At present, millimeter wave has been widely used in the communication industry. As one of the core modules of the communication system, the radio frequency power amplifier (referred to as the power amplifier), its nonlinear distortion has always been a key problem restricting the development of communication technology. The memory effect of the power amplifier will make the distortion component produced by its nonlinear characteristics not constant. As the interval between two-tone signals increases, the IMD (intermodulation signal) will deteriorate. As the frequency bandwidth increases, instability will appear. . [...
Claims
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