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1、AbstractHowtoreducetheinterferenceofcoexistingsystems,improvethespectralefficiency;andensurecooperationamongthenodes,reduceoutageprobability,achievefulldiversitygainarekeyissuestocognitiverelaynetworkresearch.Inthispaper,themethodofstochasticgeometryisusedtomodelan
2、danalyzetheaggregateinterferencegeneratedbycognitiveusers,theanalysisfocusesonhowpowerdistributionaffectsaggregateinterferencemodel;intheself^interferenceexistingtwowayrelaysystem,inequalityanalysisistheapproachforoutageprobabilitylowerboundanddiversitygainofthesys
3、temisobtainedundertheexistenceofmultiplerelays.First,inordertoachievetheprimaryusernetworkandcognitiveusernetworkcoexistence,theaggregateinterferencegeneratedbycognitiveusermusttobetakenintoaccountseriously.Withtheaggregateinterferencemodelestablishedbystochasticge
4、ometrytheory,thispaperconsidersthesingle-thresholdprotocolandmulti-thresholdprotocolsituations,analysestheimpactofdifferentpowerdistributionandcompareswiththelognormalmodel.Analysisandsimulationresultsshowthattheoptimizationpowerdistributioncanreducetheaggregateint
5、erference,theimpactofdifferentpowerdistributiononaggregateinterferencemodelisdifferent,lognormaldistributionisagoodapproximationmodeltoaggregateinterference.Secondly,inordertoensurethereliabilityoftwowayrelaysystem,thispaperanalysesoutageprobabilityofsystem.Underth
6、eamplify-and・fbrwanl(AF)mode,theSNRisoptimizedbytheaidoftherelationshipbetweenthesignal-to-noiseratiosofthesourcenodesandreconcileinequality,anewsystemoutageprobabilitylowerboundandthediversitygaininthecaseofmultiplerelaysareobtained・Simulationresultsshowthatoutage
7、probabilityobtainedbyMonteCarlosimulationapproachestoanewoutageprobabilitylowerbound;inthecaseofmulti-relayselection,thesystembasedonmaximumminimummutualinformationcriterionstillobtainsthefulldiversitygainandoptimizesthelowerboundofoutageprobability.Keywords:Cognit
8、iveRadio,TwoWayRelayCommunication,AggregateInterference,StochasticGeometry,PowerDistribution,OutageProbality,InequalityAnalysis目录专用术语注释表1第一章绪论21」
