A digital predistortion method and device
A digital pre-distortion and pre-distortion technology, applied in improving amplifiers to reduce nonlinear distortion, electrical components, transmission systems, etc., can solve the problem of complex implementation process, low ability to suppress adjacent channel interference, and inability to meet adjacent channel interference suppression. requirements, etc., to achieve the effect of being easy to implement and improving the ability of interference suppression
Active Publication Date: 2016-03-16
COMBA TELECOM SYST CHINA LTD
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[0004] However, this predistortion method is based on memory polynomials, and its ability to suppress interference to adjacent channels is low. With the increase in the level of intermodulation suppression for adjacent channels in wireless communication, it cannot meet the requirements for interference suppression to adjacent channels; and the implementation process is complicated.
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[0025] In order to facilitate the understanding of the present invention, the present invention will be described below in conjunction with the accompanying drawings.
[0026] Please refer to figure 1 , the present invention proposes a digital predistortion method, comprising steps:
[0027] 101. Collect the input signal and output signal of the power amplifier;
[0028] The input signal of the power amplifier and the output signal of the power amplifier are collected.
[0029] 102. Obtain a predistortion coefficient by using the first predistortion calculation formula;
[0030] After eliminating the delay and gain of the input signal of the power amplifier and the output signal of the power amplifier, the pre-distortion coefficient is obtained by using the first pre-distortion calculation formula; wherein, the first pre-distortion calculation formula is composed of a memory polynomial and a third-order crossover The multiplication items are superimposed, and the third-orde...
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The invention provides a digital predistortion method. The method includes steps as follows: acquiring an input signal and an output signal of a power amplifier; eliminating delays and gains of the input signal and the output signal, and obtaining a predistortion coefficient through a first predistortion computational formula; acquiring an input signal of a predistortion processing module; performing second predistortion calculation according to the input signal of the predistortion processing module and the predistortion coefficient; and outputting a predistortion signal. The invention further provides a digital predistortion device which can improve interference rejection capability to an adjacent channel and is easy to realize.
Description
technical field [0001] The invention relates to the field of mobile communication signal processing, in particular to a digital predistortion method and device. Background technique [0002] With the development of wireless communication, the signal bandwidth is getting wider and wider, and its envelope fluctuation and peak-to-average ratio are getting bigger and bigger, which puts forward higher linearity requirements for broadband signaling channels, especially mixers and power amplifiers. This is mainly because semiconductor devices have inevitable nonlinear characteristics under large signals. When broadband transmitters work in the nonlinear region, serious intermodulation components will be generated, which can cause mutual interference between signals within the band. [0003] How to improve the linearity of the system is an important problem that the broadband system needs to solve. In order to solve the problem of linearity, the commonly used method is: in the digit...
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IPC IPC(8): H03F1/32H04B1/10
Inventor 杨俊刘志
Owner COMBA TELECOM SYST CHINA LTD