A novel iterative data-aided channel estimation for time domain synchronous-OFDM

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1、ANovelIterativeData-aidedChannelEstimationforTimeDomainSynchronous-OFDMMingLIU†,MatthieuCRUSSIERE`†,Jean-Franc¸oisHELARD´††EuropeanUniversityofBrittany(UEB),InstituteofElectronicsandTelecommunicationsofRennes(IETR),INSA-Rennes,FranceE-mail:†{ming.liu,matthieu.crussiere,jean-francois.

2、helard}@insa-rennes.frAbstractTheclassicalchannelestimationmethodinsincetheintersymbolinterference(ISI)fromthepreviousTDS-OFDMiscarriedoutbasedonthePNsequenceintheOFDMsymbolisnotremovedfromthePNsequence,theGIwhichsuffersfromtheintersymbolinterferenceoftheestimationresultssufferanerro

3、rfloorevenatlowsignaltopreviousOFDMdatasymbols.Thispaperpresentsanovelnoiseratio(SNR).Toovercomethisproblem,[5]proposeddata-aidedchannelestimationmethodtorefinetheinitialtoalternatelyremovethemutualinterferencebetweenthechannelestimationobtainedfromPNsequence.ThedataPNsequenceandtheOFD

4、Mdatasymbol.Aso-calledpar-symbolsarerebuiltbasedontheLog-likelihoodratio(LLR)tialdecisionisalsousedtoreducetheerrordetectionofdatafromtheoutputofthedemapper.Thesecondchannelesti-symbols.[6]proposedtomakeharddecisionstothosereli-mationismadebasedonthesedatasymbols.Themovingableequaliz

5、eddatasymbolsthatfallinthedecisionregion.averagewithinthecoherencebandwidthisperformedontheThen,theharddecideddatasymbolsareusedasvirtualtrain-secondchannelestimationtoreducenoise.Finally,theini-ingsymbolsinthefrequencydomain,thefinalchannelesti-tialandsecondchannelestimationsarecombi

6、nedaccordingmationbeingonlymadebasedonthesevirtualtrainingsym-totheminimummeansquareerror(MMSE)criteria.Thebols.However,thismethodhaspotentialriskifthereisnotsimulationresultsdemonstratethattheproposedmethodcanenoughvirtualtrainingsymbolsavailableatlowSNR.More-significantlyimprovethem

7、eansquareerror(MSE)perfor-over,ifthereexistsdeepfadings,itispossiblethatthereismanceoftheinitialchannelestimatorandthebiterrorratenovirtualtrainingsymbolslocatedinthedeepfadingsub-(BER)performanceofrealTDS-OFDMbasedsystems.bands,henceitisdifficulttorecoverthechannelfrequencykeywords:T

8、DS-OFDM;DTMB