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1、自适应信道均衡器算法仿真与性能分析摘要摘要自适应均衡器能够自动的调节系数从而实现实时信号处理,成为通信系统中的一个重要方面,已广泛应用于通信、雷达、声纳、控制和生物医学工程等领域。自适应算法作为只适应均衡器中最重要的一环,很大程度上决定了均衡器的性能。本文介绍了自适应滤波技术的发展历史,着重阐述了直接矩阵逆(DMI)、最小均方误差(LMS),归一化最小均方误差(NLMS)和递推最小二乘算法(RLS)等四种自适应算法,运用matlab对其进行了仿真,并着重分析了延迟时间τ、信道失真参数χ以及滤波参数(LMS的步长μ、RLS的遗忘因子λ)等对均衡器稳态和瞬态性能的影响。关键词:自适应均
2、衡器,LMS,RLS,MATLABIABSTRACTABSTRACTAdaptiveequalizercoefficientscanautomaticallyadjustinordertoachievereal-timesignalprocessing,communicationsystemsbecomeanimportantaspect,hasbeenwidelyusedincommunications,radar,sonar,controlandbiomedicalengineering.Anadaptivealgorithmastheadaptiveequalizeronly
3、themostimportantpart,largelydeterminestheperformanceoftheequalizer.Thisarticledescribesthehistoricaldevelopmentofadaptivefilteringtechniques,focusesonthedirectmatrixinverse(DMI),minimummeansquareerror(LMS),normalizedleastmeansquareerror(NLMS)algorithmandrecursiveleastsquares(RLS),etc.fourkinds
4、ofadaptivealgorithm,usingmatlabitssimulationandanalyzesthedelaytimeτ,χchanneldistortionparametersandfilterparameters(stepsizeofμLMS,RLSforgettingfactorλ),suchassteady-stateandtransientequalizerimpactofstateproperties.Keywords:Adaptiveequalizer,LMS,RLS,MATLABII目录目录摘要............................
5、..................................IABSTRACT......................................................II目录..........................................................III第1章引言......................................................41.1滤波技术简介.............................................41.2滤波理论发展概述......
6、....................................41.2.1最佳线性滤波........................................41.2.2自适应滤波..........................................6第2章自适应线性滤波器..........................................82.1自适应线性组合器.........................................82.2自适应滤波器的分类.................................
7、.....9第3章常见的自适应滤波算法及对比...............................103.1基于最小均方误差准则的算法...............................103.1.1LMS算法...........................................113.1.2归一化LMS(NLMS)算法.............................143.2最小二乘算法..................