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1、上海交通大学硕士学位论文多用户下行链路传输方案研究姓名：万泓申请学位级别：硕士专业：通信与信息系统指导教师：徐昌庆20060101算法迭代过程中导入信道误差概率参数提出了一种鲁棒性的最小均方误差优化算法ROBUST-MMSE并仿真分析了其传输性能和收敛特性仿真结果表明本文提出的PL-MMSE算法具有明显的性能改进并能稳定收敛通过对ROBUST-MMSE算法与非鲁棒性算法的性能比较验证了该算法对信道参数误差具有良好的鲁棒性关键词多用户多入多出预编码空分复用信道状态信息功率分配鲁棒性IIOptimizationofMI
2、MOMulti-userDownlinkSystemABSTRACTTransceiverdesignforMIMOmultiusersystemisoneissuewhichhasattractedconsiderableattentionrecently.Bypreprocessingthedatastreamsofeachuser,thebasestation(BS)aimstocommunicationwithseveralmobilestations(MSs)inthesametimeandfrequen
3、cyslots.Thiskindofspatialmultiplexinghasthepotentialofincreasingcapacityandreliabilityatthesystemlevel.EspecialwhenitcomestothedownlinksystemwheretherearepowerandcomplexityconstraintsattheMS,itisimpracticaltotradedetectioncomplexitywithperformance.Soapplyingpr
4、ecodertechniqueattheBSwouldbesignificant,bywhichwecandesignhighcomplexitycodingthemesoastoachievehightransmissionperformance.PreviousschemesassumethatthetransmitterknowsperfectChannelStateInformation(CSI),whichisimpossiblefortheexistenceofchannelestimationerro
5、r,feedbackdelay,themovementofobjectsandtheMSsetc.Accordingtosimulation,theCSIerrorswouldinevitablybringsperformancedegradation,soitisnecessaryforustostudytherobustnessofprecodingschemes.Inthispaper,basedonthestudyofseveralexistingalgorithmslikezero-forcingalgo
6、rithm(ZF),SJNRalgorithm,BlockDiagonalizationIIIalgorithm(BD)etc,Iproposedajointschemewhichjointdesigntheprecodingvectorandpowerallocation,andthefollowingsimulationshowssignificantimprovement.Furthermore,IstudyandclassifytheCSIerrorsaccordingtotheirsource,acorr
7、espondingrobustMMSEoptimizationalgorithmisforwarded,atlastIanalyzetheperformanceandconvergenceofthealgorithmandshowthemeritsofthealgorithmbynumericalresults.ThesimulationshowsthatourPL-MMSEalgorithmclearlyimprovesthetransmissionperformance,thentherobustnessofo
8、urRobust-MMSEalgorithmisalsoconfirmedbycomparisontoitsnon-robustcounterparts.Keyword:Multi-user,MIMO,precoding,SpatialMultiplexing,CSI,PowerAllocation,RobustnessIV英文缩略语表CCICo-Chann
