认知无线电系统中自适应跨层优化机制的研究

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1、电子科技大学博士学位论文认知无线电系统中自适应跨层优化机制的研究姓名：朱江申请学位级别：博士专业：通信与信息系统指导教师：李少谦20090901摘要频谱资源的认知无线电网络中：利用微观经济学中的拍卖理论，提出了一种基于重复多标拍卖的频谱分配机制。在此机制下，网络用户是竞标者，接入点或基站在一次拍卖中充当拍卖人。竞标者为满足自身效用给频谱资源投标，由拍卖人根据最大化网络收益原则确定胜利者。为迎合不同的QoS标准，制定了三种不同的频谱分配优化目标，以及相对应的三种竞标者的价值函数。和其它分配机制相比较，本文提出的基于重复多标拍卖的机制具有几点优势：具有分散的特点，而且所需的信令交互以及

2、计算开销都很小。关键词：认知无线电系统，跨层设计，频谱管理，马尔科夫决策过程，强化学习llABSTRACTThescarcityofspectrumandoperationofcomplexnetworksbecomeinevitablecrucialproblemsinfuturewirelesscommunicationsystems，therefore，akindofintelligentcommunicationsystembasedoncognitivescience，namely,cognitiveradiosystemisproposedbyacademia．Fort

3、herapiddevelopmentofdigitalsignalprocessing,computernetworksandartificialintelligence，itispossibletorealizecognitiveradiosystemsbyhighintegrationofthesetechnologies．Howtomakecognitiveradiosystemssenseenvironment,learnfromenvironmentbyartificialintelligenceandadapttoevolutionofenvironmentbyreco

4、nfigurationofcross-layeroperationalparametersSOastoachieveflexibleandreliablecommunicationmeetingtherequirementsofsubscribersin．complexcommunicationsystemsandefficientutilizationofspectrumhaseverbeenoneimportantresearchtopicofmodernwirelesscommunicationsystems，andalsobeentheobjectiveofthispape

5、r．Thisdissertationmainlyfocuses011theadaptivecross-layerradioresourcemanagementofcognitiveradiosystems，suchassensingandaccessofspectrum,’transmissionandscheduling．Morespecifically,themainresearchcontentsandinnovationsareasfollows：1．Firstly,across—layeroptimizationframeworkofdynamicspectrumsens

6、ingandaccess，transmissionandschedulingincognitiveradiosystemsisproposed．Accordingtotheevolutionofspectrumavailabilityandsensingresults，spectrumoccupancyoflicensedusersismodelasanalternativerenewalprocessintheframework．Accordingly,statisticalcharacteristicofspectrumavailabilityisinducedandspect

7、mmsensingresultsisformulatedasadiscretetimeMarkovchain．IntheproposedconstrainedMarkovdecisionprocess(CMDP)foroptimizationframework，theevolutionofstatedoesnotaffectedbyactions．Consequently,traditionalLPismodifiedtosimplifysolutionoftheCM