简介:Spectrumsensingisoneofthecoretechnologiesforcognitiveradios(CR),wherereliabledetectionofthesignalsofprimaryusers(PUs)ispreconditionforimplementingtheCRsystems.AcooperativespectrumsensingschemebasedonanadaptivedecisionfusionalgorithmforspectrumsensinginCRisproposedinthispaper.ThisschemecanestimatethePUpriorprobabilityandthemissdetectionandfalsealarmprobabilitiesofvarioussecondaryusers(SU),andmakethelocaldecisionwiththeChair-Varshneyrulesothatthedecisionsfusioncanbedonefortheglobaldecision.SimulationresultsshowthatthefalsealarmandmissdetectionprobabilitiesresultedfromtheproposedalgorithmaresignificantlylowerthanthoseofthesingleSU,andtheperformanceoftheschemeoutperformsthatofthecooperativedetectionbyusingtheconventionaldecisionfusionalgorithms.