lte+中基于ebb的多天线技术-研究

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1、^，_h4T：b，’I之ESEARCHONBEAMFOR删GBASEDMULTI—ANTENNATECHNIQUEINLTE+SYSTEMABSTRCTLongTermEvolution(LTE)iSthemainmobilecommunicationstandardfornextgeneration，andthestandardizationworkiStakenchargeby3GPP．Currently,themajorresearchissuesincludeenhancedMIMOtechnique，whichcanimprovethesystemperformancedrama

2、tically．Especiallyintimedivisionduplex(TDD)mode，utilizingchannelreciprocity,thedownlinkchannelinformationcanbeacquiredthroughuplinkchannelestimationandtheextrasignalingoverheadforchannelfeedbackiSsaved．Thus．itiSfitforthesystemwhichisequippedwithmultipleantennas．Beamformingtechniqueisselectedasanim

3、portantMIM0configurationforitsexcellentperformanceinTDDmode．Inthisdissertation，thedownlinkenhancedbeamformingtechniqueinLTEsystemandthecorrespondingdesignofchannelqualityinformation(CQI)feedbackregimeisstudied．Throughthesystemlevelsimulation，thispapergivestheimprovedresultsbroughtbyimprovedtechniq

4、ueandthecorrespondingperformanceanalysis．ThesimulationenvironmentofMIMO—OFDMsystemisdifferentwithothersystems．Accordingtoitsowncharacteristic，thispaperdesignsasimulatorstructurewhichisquitefitforMIM0．OFDMsystem．Themodularizationmakethesimulatorhavebetterscalabilityandhigherefficiency．Therefore，the

5、simulatorCanadvantagethefuturetheoreticalstudyandsimulationvalidation．ThroughthestudyofthetraditionalbeamformingalgorithmandCQIfeedbackregime，thispaperproposesanoveladaptivebeamformingtechniquewhichiSbasedonthestreamfromsingularvaluedecomposition．Simulationresultshows，whenthefairnessfor蹿；，}一usersi

6、spromisedandtheusersatisfactiondegreeismaximized，thisalgorithmcanacquirebeRersystemperformancethantraditionalmethodwhichusesthesameresourceschedulingalgorithm．KEYWORDS：TD．LTEEBBMulti．Antenna^i。舞第一章1．11．21．3第二章2．12．22．2．12．2．22．2．32．2．42．2．52．3第三章3．13．1．13．1．23．1．33．23．2．13．2．23．2．3第四章4．14．1．14．1．2

7、4．24．2．14．2．24．2．3目录绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．1移动通信系统概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l新一代移动通信标准中TDD系统的演进⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯3本课题研究内容及意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯5LTE系统关键技术⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．7LTE物理层概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯7LTE