学位论文—基于线性预测方法的水声信道最小均方误差盲均衡中英文翻译.docx

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1、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B090310姓名胡月明学号B09031005外文出处J.MarineSci.Appl.附件1.原文；2.译文2013年03月BlindAdaptiveMMSEEqualizationofUnderwaterAcousticChannelsBasedontheLinearPredictionMethodAbstract:Theproblemofblindadaptiveequalizationofunderwatersingle-inputmultiple-output(SIMO)acou

2、sticchannelswasanalyzedbyusingthelinearpredictionmethod.Minimummeansquareerror(MMSE)blindequalizerswitharbitrarydelayweredescribedonabasisofchannelidentification.TwomethodsforcalculatinglinearMMSEequalizerswereproposed.OnewasbasedonfullchannelidentificationandrealizedusingRLS

3、adaptivealgorithms,andtheotherwasbasedonthezero-delayMMSEequalizerandrealizedusingLMSandRLSadaptivealgorithms,respectively.Performanceofthethreeproposedalgorithmsandcomparisonwithtwoexistingzero-forcing(ZF)equalizationalgorithmswereinvestigatedbysimulationsutilizingtwounderwa

4、teracousticchannels.Theresultsshowthattheproposedalgorithmsarerobustenoughtochannelordermismatch.TheyhavealmostthesameperformanceasthecorrespondingZFalgorithmsunderahighsignal-to-noise(SNR)ratioandbetterperformanceunderalowSNR.1IntroductionTime-varyingcharacteristicandmulti-p

5、athfadingofunderwateracousticchannelscaninducesevereintersymbolinterference(ISI)inhighdataratecommunicationsystems.ChannelequalizationapplyingadaptivefiltersisoneofthetechniquestomitigatetheeffectsofISI.Conventionally,theinitializationofanadaptivefilterisachievedbyaknowntrain

6、ingsequencefromatransmitterbeforedatatransmission,sothatvaluablechannelcapacityisreduced.Recently,blindequalizationtechnique(Stojanovic,1996)hasattractedmoreandmoreattention.Comparedwithadaptiveequalizationtechnique,themajoradvantageofsuchtechniqueisthatnotrainingsequenceisne

7、ededtostartuporrestartthesystemwheneverthecommunicationbreaksdownunpredictably.Traditionally,symbolratesampledchanneloutputsequenceisstationaryandhigherorderstatisticsareusedtoestimatethechannelandtocalculatetheequalizer.Morerecently,ithasbeenshownthatthechanneloutputsequence

8、iscyclostationaryifthesamplingrateexceedsthesymbolrate,andthensecond