功放的数字基带预失真技术研究

在射频通信中,大功率放大器是无线通信系统中的必要组成部分,它的非线性失真除了会造成信号带外的频谱扩展,引起临道干扰外,还会造成带内信号失真,提高误码率.因此,如何克服功放的非线性就成了通信领域的一个重要课题和研究热点.本文采用基于查找表的自适应算法,设计了自适应数字基带预失真器并进行了仿真和综合.结果表明自适应数字基带预失真方法可有效地提高功放线性度,从而提高系统性能.

Research Of Amplifier `s D ig ita l Baseband Predistortion

Whenin RF Communications System,Power amplifiers are essential components in communica-tion systems and are inherently nonlinear.The nonlinearity creates spectral growth beyond the signalbandwidth,which interferes with adjacent channels.It also causes distortions within the signal band-width,which increases the bit error rate at the receiver.This paper proposes an adaptive predistorter,whichis composed of a look-up table that can compensate for the distortion by an HAP.as a result,thedistortion can be eli m...