[8]Fast varying channel estimation in downlink LTE systems英文清晰版

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1、2010IEEE21stInternationalSymposiumonPersonalIndoorandMobileRadioCommunicationsFastVaryingChannelEstimationinDownlinkLTESystemsYoussefElHajjShehadeh(1)(2)andSerdarSezginer(1)SequansCommunications,Paris,France(1)UniversityofGoettingen,Germany(2)(sinceJan2010)E-mail:sheh

2、adeh@informatik.uni-goettingen.de,serdar@sequans.comAbstractThispapertacklestheproblemoffastvaryingforfast-varyingchannelestimation[1].Basically,thismethodchannelestimationinLTEsystems.Particularattentionisgivenreducesthecomplexityastheproblemisreducedtoestimatingtodo

3、wnlinktransmissionwhereOFDMAisusedasthemultiplethebasiscoefficients.AmongtheexistingBEMs,aparticularaccesstechniquefortheairinterface.InOFDMA,fastvariationattentionhasbeengiventothepolynomialBEM(P-BEM)[2,ofthechannelresultsinsignificantinter-carrierinterference(ICI)whic

4、hcannotbemitigatedwithconventionalestimationand3,4]forrelativelylowDopplerspreads.Itmainlyconsistsequalizationtechniques.Inthispaper,weinvestigatethepolyno-ofapproximatingthechannelvariationduringacertaintimemialmodelingofrapidlytimevaryingchannels.Specifically,wewindo

5、wbyapolynomialfunction.Although,P-BEMhasproposeatime-domainestimationmethodandalow-complexityanattractiveperformancewhenthewholebandisavailablefrequency-domainestimationmethodbothofwhichleveragetheforestimation,itisshownin[2]thatwithasparsepilotspecialstructureoftheap

6、proximatedchannelmatrixtocomputeICIchannelcomponents.ItisshownbysimulationsthatthesedistributionasinLTEwecannotestimatedirectlyICIterms.twomethodsprovideaconsiderableperformanceimprovementIn[2],authorshaveinvestigatedtheimprovementprovidedbyoverconventionalmethodsbyme

7、ansofimprovedICImitigation.usingfirstorderpolynomialapproximationovertwosucces-WefurtherstudytherobustnessofthesetwomethodstobothsiveOFDMsymbolstoestimatethechannelvariationbasedpartialandfullchannelprofileknowledge.Ithasbeenshownongivenpilotdistributions.Then,theobtain

8、edinitialtimethatthefrequency-domainapproachhasmuchlowercomplexityandbetterrobustnesscomparedtothetimedomainapproach.domaine