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1、摘要提高了检测概率。关键词：认知无线电，合作感知，证据理论，异步合作感知，节点选择II万方数据ABSTRACTABSTRACTWiththegrowthofwirelesscommunicationapplications,thespectrumbecomesmoreandmorecongested.However,thetraditionalmanagementoffixedallocationspectrumresourcesmakesmostofthespectrunisusuallystate,whichreducesthe
2、utilization.Inordertoimprovetheutilizationandcompensateforthesedisadvantages,peopleputforwardCognitiveRadio(CR).Undertheconditionofthatdonotaffectthecommunitionoftheprimaryuser(PU),secondaryuser(SU),throughspectrunsensingandintelligentlearning,canrealizedynamicallocati
3、onandsharethespectrum,makefulluseofthespectrumresources.Thespectrumsensingistheprerequisitesofcognitiveradio,andwewillmakesadeepresearchaboutitinthispaper.Thispaperintroducesthedevelopmenthistory,thecurrentresearchofcognitiveradio,andtheralatedtechnicalbackgroundofthes
4、pectrumsensingtevhnology.Aftercomparingthelocalsensingmethods,wesummarizetheiradvantages,analyzetheirdeficiencies,andselectthecooperativespectrumsensingasareserchfocus.Throughintroducingandanalyzingthetraditionalclassicalcooperativespectrumsensingmethods,weproposeareal
5、iblecooperativespectrumsensingalgorithmtoimprovethedetectionprobabilityandthecredibilityofthealgorithm.Inthealgorithm,eachSUdividesthesensingareaintothreeparts,calculatesthetrustfunctionsasthelocalsensingresultswiththedoublethreshold,andthefusioncenter(FC)fusesthesedat
6、eandgiveafinaldecisionwiththeDempster-Shafer(D-S)theory.Simulationresultsshowthatthedetectionperformanceofthisalgorithmisbetterthan“generalD-Stheory”,“and”,“or”and“singlenode”inthesameconditions.Inpractice,SUsmaysufferfromfading,shadowingandtime-varyingnatureofwireless
7、channels.Actually,thesensingresultsarriveatthecenterindifferenttime,orevencannotreachthecenter.IfuntilwaitallresultsarrivingtheFCtofuse,whichwillwastalotoftime.So,asynchronouscooperativespectrumsensingisproprsed.InFC,itusesthesliding-windowmethodtoensurethereal-timeand
8、asynchronismofthefusiondata.Inaddition,inordertoreducetheamountofdatafusioninFC,weproposethenodeselection.SUscontinuo
