osdm+mu-mimo下行信道资源联合优化算法-研究

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1、摘要比特分配设计在不需要额外功率的前提下对总传输速率有明显的提升。本文所提出的的优化模型及其解决方案可以推广到除MPAM和QAM以外的其他调制方式。关键词：比特分配，MU-MIMO，OSDM，功率分配，用户选择II万方数据ABSTRACTABSTRACTUnderagivenmodulationschemeandatargetBER(biterrorrate)requirement,itisdifficulttoincreasethenumberofbitstransmittedineachsymbol(i.e.,therate),sincethisgenerallyrequire

2、sasignificantincreaseoftransmitpower.Inthispaper,westudyhowtoincreasetherateinmultiusermultiple-inputmultiple-output(MU-MIMO)broadcastchannelsusingonlybitandpowerloading,withoutrequiringadditionaltransmitpower.Tosolvethischallengingproblem,ourapproachistocarryoutajointdesignofbitloadingandpowe

3、rallocationoverallstreams,andmeanwhiletakeuserandstreamselectionintoaccount.Specifically,wemaximizethetotalnumberofbitspersymbol(ratherthantheShannoncapacity)overallselectedstreams,underatargetBERconstraintforeachstreamandaconstanttotaltransmitpowerconstraint.Toenableflexibleuserandstreamselec

4、tionaswellasachievingahightotalrate,weconsiderOSDM(orthogonalspacedivisionmultiplexing)ratherthanBD(blockdiagonalization)basedMU-MIMObroadcastchannels.Thisarticle'sinnovationworkareasfollows:FirstlyweputforwardamorepracticaloptimizationmodelinMU-MIMOinthispape.Undertheconditionofthetotaltransm

5、issionpower,theoptimizationgoalisnotshannoncapacity,buttheactualtransferrateofthesystem.Andconsideringthequalityofeachchannelofcommunicationrequirement,wealsotaketheBERconstraintsintoconsiderationintheoptimizationmodel.Againconsideringthenumberofbitstheactualsystemcanachieve,theoptimizationmod

6、ellimitethehighestthenumberofbitspersymbolcanloadon.TakeMPAMandQAMmodulationasanexample,wededuceddifferentBERexpressionwithdifferentmodulationmodesinMU-MIMOchannel.Basedontheproposedoptimizationmodelwebuildasimilaroptimizationproblem.Secondlyinordertosolvethisoptimizationproblem,theuseranddata

7、flowhasbeenselectedandallhasbeenchoosedundertheconditionofparallelsub-channels.Inthispaperweputsforwardanimprovedadaptivebitandpowerallocationalgorithm,inIII万方数据ABSTRACTwhichbitallocationandpowerallocationwillbejointlyoptimized.Duetothe