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1、DMRSDesignandChannelEstimationforLTE-AdvancedMIMOUplinkXiaolinHou,ZhanZhang,HidetoshiKayamaDOCOMOBeijingCommunicationsLaboratoriesCo.,Ltd.Beijing,ChinaEmail:{hou,z.zhan,kayama}@docomolabs-beijing.com.cnAbstractIn3GPPlongtermevolution(LTE)uplink,singleupli
2、nksharedchannel(PUSCH).transmitantennaisadoptedduetoitssimplicityandacceptableAsfortheDMRSdesigntosupportuplinkMIMO,thereperformance.However,inordertosatisfythehigherrequirementaretwopossiblewaysforward,i.e.,time-domaincodedivi-ofLTE-Advanced(LTE-A)onupli
3、nkspectrumefficiency,multi-sionmultiplexing(TD-CDM)[8-11]andfrequency-domainpletransmitantennasmustbesupportedinLTE-Auplink.Atthesametime,thebackwardscompatibilitytoLTEshouldbetakencodedivisionmultiplexing(FD-CDM)[10-13].TD-CDMhasintoconsiderations.Therefo
4、re,thedemodulationreferencesignalseveralapparentdisadvantages,suchascanonlysupporttwo(DMRS)aswellaschannelestimationhavetobere-designedfortransmitantennas,isonlyvalidforlowmobilitycasesandcan-LTE-Auplinktosupportmultiple-inputmultiple-output(MIMO)notsuppo
5、rtPUSCHhoppingwithinonesubframe.Therefore,transmission.Inthispaper,weproposetheDMRSdesignFD-CDMisanaturalandbetterchoice.However,thereareforLTE-AMIMOuplinkviafrequencydomaincodedivisionmultiplexing(FD-CDM)withthemaximumdistancebindingstilltworemainingprob
6、lemstobesolved,i.e.,howtoassign(MDB),whichcanminimizetheinterferenceamongmultipledifferentDMRSsequencestodifferenttransmitantennasandtransmitantennas.Moreimportantly,itisbackwardscompatiblehowtoensurethebackwardscompatibilitytoLTE.OnthetotheDMRSinLTEuplin
7、k,i.e.,fewmodificationstothecurrentotherhand,channelestimationforLTEuplinkisgenerallyspecificationsareneeded.Furthermore,theimproveduplinkbasedondiscreteFouriertransform(DFT)withcyclicprefixchannelestimationwithdynamicchannelimpulseresponsereser-vation(DCIR2
8、)andfrequencydomainwindowing/dewindowingreservation(CPR)[14].Becausethismethoddoesnotconsiderisproposedtoenhancethechannelestimationaccuracyandthechannelimpulseresponse(CIR)energyleakageproblemuplinkreliabilityforbo
