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基于分步优化策略的稀疏码多址接入技术研究的开题报告.docx

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基于分步优化策略的稀疏码多址接入技术研究的开题报告 一、研究背景和意义 Withtherapiddevelopmentofwirelesscommunicationtechnology,manyapplicationshaveputforwardhigherrequirementsforcommunicationsystemperformance.Oneofthecriticalproblemsfacedbycommunicationsystemsisthelimitedtransmissioncapacity,especiallyinthelimitedfrequencyresources.Therefore,theissueofhowtoimprovetheefficiencyoffrequencyutilizationandincreasethedatatransmissionratehasbecomemoreandmoreimportantforwirelesscommunicationsystems. Sparsecodemultipleaccess(SCMA)technologyisanewnonorthogonalmultipleaccesstechnology.Itusesaspecialsum-productencodinganddecodingmechanism,whichcanbeusedtorepresentmultipledatastreamswithasparsecodebook.However,conventionalSCMAschemeshavelimitationsinthecapacityandthediversitygain,whichlimittheperformanceofthesystem. ToovercomethelimitationsofSCMAsystems,theconceptofastepwiseoptimizationstrategyforSCMAhasbeenproposed.Thismethodseparatestheoptimizationstagesfromtheencodinganddecodingprocesses.Thisapproachallowsformoreefficientcodebookdesignandcanimprovetheperformanceofthesystem.Therefore,thestudyofastepwiseoptimizationstrategyforSCMAhasgreatpracticalsignificanceforimprovingtheperformanceofwirelesscommunicationsystems. 二、研究内容和方法 Theresearchaimstoexplorethefollowingfouraspectsofthestepwiseoptimizationstrategyofsparsecodemultipleaccesstechnology: 1.Thedesignofasparsecodebook:BasedontheGaussianrandommatrixandtheKroneckerproduct,anewcodebookdesignapproachthatcanefficientlyachievetheoptimaltransmissionrateanddiversitygainforthesystemwillbeproposed. 2.Thejointdesignofencoderanddecoder:AjointdesignschemebetweenencodinganddecodingwillbedevelopedtoimprovetheperformanceoftheSCMAcommunicationsystembyadjustingtheencodingmatrixandthedecodingmatrix. 3.Theoptimizationofthepowerallocation:TheoptimizationofpowerallocationcanimprovetheenergyefficiencyoftheSCMAsystem.Anewoptimizationalgorithmthatcanachievetheoptimalpowerallocationbasedonthegivenchannelconditionswillbeproposed. 4.Performanceevaluation:TheperformanceoftheSCMAsystemwith