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1、IEEETRANSACTIONSONWIRELESSCOMMUNICATIONS,VOL.1,NO.1,JANUARY200267SimplifiedChannelEstimationforOFDMSystemsWithMultipleTransmitAntennasYe(Geoffrey)Li,SeniorMember,IEEEAbstract—Multipletransmit-and-receiveantennascanbeusedrameterestimationofdispersivefadingchannels.In
2、stead,theinorthogonalfrequencydivisionmultiplexing(OFDM)systemsoptimaltrainingsequencesfordifferenttrainingantennasaretoimprovecommunicationqualityandcapacity.Inthispaper,showntobelocalorthogonal,i.e.,foranystartingpositiontheywepresenttwotechniquestoimprovetheperfo
3、rmanceandareorthogonalovertheminimumsetofelements.Furthermore,reducethecomplexityofchannelparameterestimation:optimumtraining-sequencedesignandsimplifiedchannelestimation.Thethisalsoresultsinsimplifiedchannelestimation.optimaltrainingsequencesnotonlysimplifytheiniti
4、alchannelWhenOFDMsystemsareusedfordatatransmission,pilot-estimation,butalsoattainthebestestimationperformance.Thesymbol-aidedordecision-directedestimationmustbeusedtosimplifiedchannelestimationsignificantlyreducesthecomplexitytrackchannelvariations.Forsystemswithonl
5、yonetransmitan-ofthechannelestimationattheexpenseofanegligibleperfor-tenna,channelparameterestimation[6]–[11]hasbeensuccess-mancedegradation.TheeffectivenessofthenewtechniquesisdemonstratedthroughthesimulationofanOFDMsystemwithfullyusedtoimprovetheperformance.Forsys
6、temswithmul-two-transmitandtwo-receiveantennas.Thespace-timecodingtipletransmitantennas,achannelestimatorhasbeendevelopedwith240informationbitspercodewordisusedfortransmitin[5]byusingthecorrelationofthechannelparametersatdif-diversity.Fromthesimulation,therequiredsi
7、gnal-to-noiseratioisferentfrequencies.However,itrequirestheinversionofalargeonlyabout9dBfora10%worderrorrateforachannelwiththematrixtodecoupletheinter-antennainterference.Hence,asim-typicalurban-orhilly-terraindelayprofileanda40-HzDopplerfrequency.plifiedchannelesti
8、matorisdesiredtoreducethecomplexity.Inthispaper,wepresenttworeduced-complexitychanneles-IndexTerms—MIMOsystems,OFDM,parameterestimation,ti
