计算机应用研究2018，Vol.35Issue(3)：870-873,878,5.DOI:10.3969/j.issn.1001-3695.2018.03.048
一种宽带OFDM系统中记忆非线性功放的预失真方法
Predistortion method for memory nonlinear amplifier in wideband OFDM system
摘要
Abstract
To solve memory noulinear distortion problem of power amplifier in wideband OFDM system,this paper proposed a new frequency domain predistortion scheme.This scheme built the adaptive updating amplitude and phase predistortion matrices in the frequency domain respectively,which did amplitude and phased predistortion repeatedly.Furthermore,to improve convergence speed of the adaptive predistortion,this paper developed a novel algorithm of the adaptive predistortion matrices,called linear convergence algorithm.Simulation results show that,the transmission signal's spectral side lobes are 6 dB lower than those of the two-dimensional look-up table method.And when the BER is 10-4,the proposed method also has about 2 dB gain of SNR.In addition,the convergence speed of linear convergence algorithm is increased by 75％.Thus,the proposed frequency domain predistortion scheme can improve the convergence accuracy and convergence speed effectively.关键词
功率放大器/记忆非线性失真/频域预失真/线性收敛算法Key words
power amplifier/memory nonlinear distortion/frequency domain predistortion/linear convergence algorithm分类
信息技术与安全科学引用本文复制引用
张念华,任智源..一种宽带OFDM系统中记忆非线性功放的预失真方法[J].计算机应用研究,2018,35(3):870-873,878,5.基金项目
国家自然科学基金资助项目(61401331) （61401331）
国家重点研发计划政府间专项项目(2016YFE0123000) （2016YFE0123000）
高校基本科研业务费(20101155739) （20101155739）
