一种基于LMS滤波的单通道窄带干扰抑制平滑算法  

A Single-input Narrow-band Interference Suppression and Smoothing Algorithm Based on LMS filter

作　　者：王纪东 吴治国 付睿 WANG Jidong;WU Zhiguo;FU Rui(Wuhan Maritime Communication Research Institute,Wuhan 430079)

机构地区：[1]武汉船舶通信研究所,武汉430079

出　　处：《舰船电子工程》2019年第2期66-71,109,共7页Ship Electronic Engineering

摘　　要：信道中的窄带干扰严重影响通信的可靠性,因此必须加以抑制。针对现有方法在处理低频单音窄带干扰时的缺陷,提出了一种基于LMS滤波的单通道窄带干扰抑制平滑算法。该算法首先将受到干扰污染的信号复制为两路输入并做预处理,其次利用LMS滤波器进行窄带干扰抑制并获取滤波器响应与参考信号间的差值;最后针对低频单音干扰对输出的差值序列进行平滑处理。仿真结果表明,该算法能够对窄带单音干扰进行抑制,尤其在干扰频率较低时能够有效提升接收端信干比,提高通信质量。Narrow-band interference should be cancelled or communication reliability will be destroyed.A single-input narrow-band interference suppression and smoothing algorithm based on LMS filter is proposed for the flaw of traditional LMS algorithm when frequency of NBI is low.Firstly the interfered signal is copied and pre-processed.Then most power of NBI is supperessed by LMS filter,and difference value between output and expected response is obtained.Finally the difference value sequence is smoothed in order to suppress low-frequency NBI further.Simulation results show that NBI could be suppressed with the algorithm,particularly low-frequency NBI can be restrained,which means better SIR for receiving end and higher communication quality is provided.

关 键 词：LMS算法 自适应滤波器 窄带干扰抑制 平滑处理 有限字长效应 

分 类 号：TN92[电子电信—通信与信息系统]