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1、下行多用戶MIMO系統(tǒng)的協(xié)同波束賦形技術(shù)//.paper.edu-1-中國科技論文在線CoordinatedBeamformingforMultiuserMIMODownlinkSystems#WANGHualei,LILihua,SONGLei*Foundations:SpecializedResearchFundforDoctoralProgramofHighEducation(No.29><>0070013028)Briefauthorintroduction:王化磊，（1987><7-），女，學生，(SchoolofIn
2、formationandCommunicationEngineering,BeijingUniversityofPostsandTelecommunications,Beijing1008<76)5Abstract:Coordinatedblockdiagonalization(BD)isawell-knowncoordinatedbeamformingalgorithmformultiuserMIMOdownlinksystemswherethebasestationemploysmultipleantennasandtheu
3、sersintheterminalareequippedwithmultipleantennas.Duetonotconsideringthemultiuserinterference(MUI)andnoisewhenselectingthesubchannelsandobtainingtheprecodingvectors,theperformanceofthecoordinatedBDalgorithmispoor.Inthispaper,weproposeanovelcoordinated10beamformingappr
4、oachformultiuserMIMOdownlinksystems,whichtakestheMUIandnoiseintoaccountwhenselectingthesubchannelsandobtainingtheprecodingvectors.SimulationresultsalsoconfirmthattheproposedcoordinatedschemeoutperformstheconventionalcoordinatedBDscheme,whichneverconsidersthenoise’sin
5、fluenceintheprocessofobtainingthetransmitbeamformingvectors.15Keywords:Multi-inputmulti-output(MIMO);Multiuser;coordinatedbeamforming;blockdiagonalization(BD);coordinatedBD;channelextension0IntroductionMulti-inputmulti-output(MIMO)systemshavedrawnalotofattentioninthe
6、pastfewyears20becauseoftheirpromisingimprovementintermsofperformanceandbandwidthefficiency[1][2][3].AnimportantresearchtopicisthestudyofmultiuserMIMOsystems,whichhavethepotentialtocombinethehighthroughputachievableinMIMOprocessingwiththebenefitsofspacedivisionmultipl
7、eaccess(SDMA).Morerecently,theresearchesofthecapacityregionofthemultiuserMIMObroadcastchannels(BC)havebeenofconcern[4][5].25In[6],itwasshownthatthemaximumsumrateinmultiuserMIMOsystemscanbeachievedbydirtypapercoding(DPC).However,it’sdifficulttoimplementinpracticalsyst
8、emsduetothehighcomputationalburdenofsuccessiveencodinganddecodings.Substantialworkshavebeendonetodesignprecodingvectorsformultiuser
