压缩感知框架下宽带功放预失真模型  

Predistortion model of broadband power amplifier in compressed sensing framework

作　　者：高明明[1] 张春雨 南敬昌[1] Gao Mingming;Zhang Chunyu;Nan Jingchang(School of Electronic&Information Engineering,Liaoning Technical University,Huludao Liaoning 125105,China)

机构地区：[1]辽宁工程技术大学电子与信息工程学院,辽宁葫芦岛125105

出　　处：《计算机应用研究》2021年第2期526-529,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(61701211);辽宁省特聘教授项目(551710007004)。

摘　　要：射频功放的非线性特性是一个重要的研究方向,针对预失真系统采样率过高的问题,提出一种新的宽带功放预失真模型,即在反馈回路采用基于正弦调频(SFM)信号的调制宽带解调(MWC)对信号进行采样,再用变步长广义自适应匹配追踪(VS-GSAMP)算法对信号进行重构,降低反馈回路采样速率,提升线性化效果。实验结果表明,在提高信号重构精度的同时,NSME(normalized mean squared error)显示较MP、GMP模型提升了2~3 d B,ACPR(adjacent channel power radio)约改善了21 d B,该方法能够使系统在较低的采样率下获得良好的线性性能。The nonlinear characteristics of RF power amplifiers is an important research direction.To address the problem of high sampling rate in the amplifier predistortion system,this paper proposed a new brodaband power amplifier predistortion model.Firstly,it used the modulation wideband converter(MWC)based on sinusoidal frequency modulation(SFM)signal to spare the signal in the feedback loop,and then used the variable step size generalized adaptive matching tracking(VS-GSAMP)algorithm to reconstruct the signal.The experimental results show that normalized mean squared error(NSME)is about 2~3 dB better than memory polynomial(MP)model and the general memory polynomial(GMP)model.The adjacent channel power radio can be improved to 21 dB.Good linear performance can be achieved at a lower sampling rate.

关 键 词：功率放大器 调制宽带解调 压缩感知 数字预失真 

分 类 号：TN722.5[电子电信—电路与系统]