coordinatedmultipoin省略dcellularmobile.doc

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

2、totheusefulinformationbycontrollingtheinterferingsignalsamongadjacentcells．Theoretically，itisabreakthroughfromthetraditionalinterferencelimitednon-cooperativesinglepointtransmissionsystem，improvinglinkreliabilityandenhancingthedatarate．CoMPisregardedasoneofthemost

3、essentialandeffectivetechniquesineliminatingtheinter-cellinter-ference，boostingcelledgethroughputandoverallsystemthroughput．CoMPtechniquehasobviousadvantagesinTDD(timedivisionduplexing)cellularmobilesystem;thenecessarychannelstateinformationforCoMPcanbeeasilyob-ta

4、inedthroughchannelreciprocitypropertyinTDDsystem．CoMPschemeinTDDsystemandlikelyproblemsareana-lyzedinthispaper，anditisshownbysystemsimulationsthatthesignificantgaincanbeachieved．Keywords:multiantennatechnique;CoMP;TDDsystem;channelreciprocityments，andcoordinateint

5、erference．BeamformingtechniquebasedontheSmartAntennaisalsostandard-izedin3GPPLTErelease8toboosttheperformanceofcelledgeusers．In3GPPLTErelease9，thebeamformingtechniqueisfurtherdevelopedasmultilayersbeamformingtechnique，supportingspatialdomainmultiplelayerstransmiss

6、ion，whichcanachievebeamforminggainandthespatialmultiplexinggainatthesametime．FromtheSmartAntennainTD-SCDMAtosinglelayerandmultilayersbeamforminginLTE，onecom-monfeatureisthatinbothcasesbasestationobtainstheDLchannelstateinformationbymeasuringULchannelduetochannelre

7、ciprocity．Channelreciproci-tyisanaturalfeatureoftheTDDsystemtoobtaintheDLchannelinformation，andrealizingmultiantennatechniqueinTDDsystemisveryadvantageous．ITU(InternationalTelecommunicationUnion)hassetastringentrequirement［3］onfuturemobilecommu-nicationsystem，IMT-

8、Advanced，forexample:peakDLandULtransmissionrateofupto1Gbpsand500Mbps，respectively，peakDLandULspectraleffi-ciencyofupto30bps/Hzand15bps/Hz．Complexmultian