coordinatedmultipoin省略dcellularmobile

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1、inTDDcellularmobilesystemSunShaohui，GaoQiubin，RakeshTamrakar，WangYingmin(DepartmentofSystemandStandard，DatangMobileCommunicationsEquipmentCo．Ltd，Beijing100083，China)Abstract:Coordinatedmulti-pointtransmission/reception，CoMP，techniqueconvertstheinterferencesignalintotheusefulinformationbycontroll

2、ingtheinterferingsignalsamongadjacentcells．Theoretically，itisabreakthroughfromthetraditionalinterferencelimitednon-cooperativesinglepointtransmissionsystem，improvinglinkreliabilityandenhancingthedatarate．CoMPisregardedasoneofthemostessentialandeffectivetechniquesineliminatingtheinter-cellinter-f

3、erence，boostingcelledgethroughputandoverallsystemthroughput．CoMPtechniquehasobviousadvantagesinTDD(timedivisionduplexing)cellularmobilesystem;thenecessarychannelstateinformationforCoMPcanbeeasilyob-tainedthroughchannelreciprocitypropertyinTDDsystem．CoMPschemeinTDDsystemandlikelyproblemsareana-ly

4、zedinthispaper，anditisshownbysystemsimulationsthatthesignificantgaincanbeachieved．Keywords:multiantennatechnique;CoMP;TDDsystem;channelreciprocityments，andcoordinateinterference．BeamformingtechniquebasedontheSmartAntennaisalsostandard-izedin3GPPLTErelease8toboosttheperformanceofcelledgeusers．In3

5、GPPLTErelease9，thebeamformingtechniqueisfurtherdevelopedasmultilayersbeamformingtechnique，supportingspatialdomainmultiplelayerstransmission，whichcanachievebeamforminggainandthespatialmultiplexinggainatthesametime．FromtheSmartAntennainTD-SCDMAtosinglelayerandmultilayersbeamforminginLTE，onecom-mon

6、featureisthatinbothcasesbasestationobtainstheDLchannelstateinformationbymeasuringULchannelduetochannelreciprocity．Channelreciproci-tyisanaturalfeatureoftheTDDsystemtoobtaintheDLchannelinformation，andrealizingmultiantennatechniqueinTDDsystemisveryadvantageous．ITU(InternationalTelecommunicationUni

7、on)hassetastringentrequirement［3］onfuturemobilecommu-nicationsystem，IMT-Advanced，forexample:peakDLandULtransmissionrateofupto1Gbpsand500Mbps，respectively，peakDLandULspectraleffi-ciencyofupto30bps/Hzand15bps/Hz．Complexmultian