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ID:29996302
大小:492.50 KB
页数:16页
时间:2018-12-25
《基于lms算法的自适应组合滤波器中英文翻译【完稿】》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、CombinedAdaptiveFilterwithLMS-BasedAlgorithms´Abstract:Acombinedadaptivefilterisproposed.ItconsistsofparallelLMS-basedadaptiveFIRfiltersandanalgorithmforchoosingthebetteramongthem.Asacriterionforcomparisonoftheconsideredalgorithmsintheproposedfilter,wetaketheratiobetweenbiasandvarianceofthew
2、eightingcoefficients.Simulationsresultsconfirmtheadvantagesoftheproposedadaptivefilter.Keywords:Adaptivefilter,LMSalgorithm,Combinedalgorithm,Biasandvariancetrade-off1.IntroductionAdaptivefiltershavebeenappliedinsignalprocessingandcontrol,aswellasinmanypracticalproblems,[1,2].Performanceofanad
3、aptivefilterdependsmainlyonthealgorithmusedforupdatingthefilterweightingcoefficients.ThemostcommonlyusedadaptivesystemsarethosebasedontheLeastMeanSquare(LMS)adaptivealgorithmanditsmodifications(LMS-basedalgorithms).TheLMSissimpleforimplementationandrobustinanumberofapplications[1–3].However,s
4、inceitdoesnotalwaysconvergeinanacceptablemanner,therehavebeenmanyattemptstoimproveitsperformancebytheappropriatemodifications:signalgorithm(SA)[8],geometricmeanLMS(GLMS)[5],variablestep-sizeLMS(VSLMS)[6,7].EachoftheLMS-basedalgorithmshasatleastoneparameterthatshouldbedefinedpriortotheadapta
5、tionprocedure(stepforLMSandSA;stepandsmoothingcoefficientsforGLMS;variousparametersaffectingthestepforVSLMS).Theseparameterscruciallyinfluencethefilteroutputduringtwoadaptationphases:transientandsteadystate.Choiceoftheseparametersismostlybasedonsomekindoftrade-offbetweenthequalityofalgorithm
6、performanceinthementionedadaptationphases.WeproposeapossibleapproachfortheLMS-basedadaptivefilterperformanceimprovement.Namely,wemakeacombinationofseveralLMS-basedFIRfilterswithdifferentparameters,andprovidethecriterionforchoosingthemostsuitablealgorithmfordifferentadaptationphases.Thismeth
7、odmaybeappliedtoalltheLMS-basedalgorithms,althoughwehereconsideronlyseveralofthem.Thepaperisorganizedasfollows.AnoverviewoftheconsideredLMS-basedalgorithmsisgiveninSection2.Section3proposesthecriterionforevaluationandcombinationofadaptivealgorithms.Simulationresults
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