外文翻译--基于线性预测方法的水声信道最小均方误差盲均衡（节选）

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1、中文3775字毕业设计(论文)外文资料翻译系别电子信息系专业通信工程班级姓名学号外文出处J. Marine Sci. Appl. (2011) 10: 113-120 附件1.原文；2.译文2013年03月BlindAdaptiveMMSEEqualizationofUnderwaterAcousticChannelsBasedontheLinearPredictionMethodRBragos,RBlanco-EnrichAbstract:Theproblemofblindadaptiveequalizationofund

2、erwatersingle-inputmultiple-output(SIMO)acousticchannelswasanalyzedbyusingthelinearpredictionmethod.Minimummeansquareerror(MMSE)blindequalizerswitharbitrarydelayweredescribedonabasisofchannelidentification.TwomethodsforcalculatinglinearMMSEequalizerswereproposed.On

3、ewasbasedonfullchannelidentificationandrealizedusingRLSadaptivealgorithms,andtheotherwasbasedonthezero-delayMMSEequalizerandrealizedusingLMSandRLSadaptivealgorithms,respectively.Performanceofthethreeproposedalgorithmsandcomparisonwithtwoexistingzero-forcing(ZF)equa

4、lizationalgorithmswereinvestigatedbysimulationsutilizingtwounderwateracousticchannels.Theresultsshowthattheproposedalgorithmsarerobustenoughtochannelordermismatch.TheyhavealmostthesameperformanceasthecorrespondingZFalgorithmsunderahighsignal-to-noise(SNR)ratioandbe

5、tterperformanceunderalowSNR.1IntroductionTime-varyingcharacteristicandmulti-pathfadingofunderwateracousticchannelscaninducesevereintersymbolinterference(ISI)inhighdataratecommunicationsystems.Channelequalizationapplyingadaptivefiltersisoneofthetechniquestomitigatet

6、heeffectsofISI.Conventionally,theinitializationofanadaptivefilterisachievedbyaknowntrainingsequencefromatransmitterbeforedatatransmission,sothatvaluablechannelcapacityisreduced.Recently,blindequalizationtechnique(Stojanovic,1996)hasattractedmoreandmoreattention.Com

7、paredwithadaptiveequalizationtechnique,themajoradvantageofsuchtechniqueisthatnotrainingsequenceisneededtostartuporrestartthesystemwheneverthecommunicationbreaksdownunpredictably.Traditionally,symbolratesampledchanneloutputsequenceisstationaryandhigherorderstatistic

8、sareusedtoestimatethechannelandtocalculatetheequalizer.Morerecently,ithasbeenshownthatthechanneloutputsequenceiscyclostationaryifthesamplingratee