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1、TimeCodedMIMO-OFDMSystemsChineseJournalofElectronicsVo1.16,No.1,Jan.2007DeterminedSemi?—blindAlgorithmforChannelEstimationinSpace?—TimeCodedMIMO-OFDMSystems术zuoZhidongandZHANGHailin(TheNationalKeyLaboratoryonISN,XidianUniversity,Xi'an71O071,China)Abstract....——AnOrthogonalfrequencyd
2、ivisionmulti-plexing(OFDM)systemwithaMultipleinputmultipleoutput(MIMO)conflgurationisconsidered,whichusesSpace-timecoding.Ablindmethodisproposedfores-timatingtheMIM0—0FDMsystem'schannelresPonses.whichusesthespecialprocessingafterSpace-Timeencod—ingonpartofsub-carrierstoacquirethecha
3、nnels'esti—mates.Themethodisdiff_erentwiththeblindestimatorsbasedonthesecondstatisticinformation,whichneedalotofreceiverdatablockstoachievethechannelestimation.0ursolutionisadeterminedalgorithmofchannelestima-tion,whichcanachievegoodestimationperformanceforthehighersignalnoiseratiov
4、alueswithonlytwoOFDMblocks.Thealgorithmisrobusttothediff_erentkindsofmodulationschemes.InthePresenceofnoise,thealgo-rithmhasverylowcomplexity-onlysingleeigenvaluede-compositionisneeded,nomatterhowmanyOFDMblocksareused.0neofthemostdesirablemeritsofthisapproachisitsdataefficiency-itca
5、nbeimplementedusingtwodatablockstoachievereasonablyaccurateestimate,andthispropertyisindependentofthedecoderorfinitealphabetproperty.Finally,wedemonstratevalidityofthealgorithmbysomesimulations.Keywords——Blindchannelestimation,Multipleinputmultipleoutput,Orthogonalfrequencydivisionm
6、ultiplex-ing,Receiverdiversity,Dataefficiency.I.IntroductionOrthogonalDequencydivisionmultiplexing(OFDM),be—causeofthesplitofahighratedatastreamintoaparalleloflowerratedatastreams.providesthemuch—neededresis—tancetomultipathfadingandhasattractedincreasinginter—estinrecentyears.Ithas
7、shownthatbyutilizingmultipleantennaarchitecturesbothatthetransmitterandreceiver.so—calledMultipleinputmultipleoutput(MIMO)architec—tures,vastlyincreasedchannelcapacitiesarepossible.Theadoptionofspace—timecodingtechniquestowidebandchan-nelscanimprovetheperformanceadvantageofMIMO—OFDM
8、system.Whencoherent
