下行多用户mimo系统的协同波束赋形技术

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1、下行多用户MIMO系统的协同波束赋形技术//.paper.edu-1-中国科技论文在线CoordinatedBeamformingforMultiuserMIMODownlinkSystems#WANGHualei,LILihua,SONGLei*Foundations:SpecializedResearchFundforDoctoralProgramofHighEducation(No.29><>0070013028)Briefauthorintroduction:王化磊，（1987><7-），女，学生，(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