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1、ThisfulltextpaperwaspeerreviewedatthedirectionofIEEECommunicationsSocietysubjectmatterexpertsforpublicationintheWCNC2007proceedings.CooperativeSpectrumSensingforCognitiveRadiosunderBandwidthConstraintsChunhuaSun,WeiZhang,andKhaledBenLetaief,Fellow,IEEEDepartmentofE
2、lectronicandComputerEngineeringTheHongKongUniversityofScienceandTechnologyKowloon,HongKongEmail:{sunnyhua,eewzhang,eekhaled}@ust.hkAbstract—Incognitiveradiosystems,cooperativespectrumItwasshownthattwoorthreebitsquantizationwasmostsensingisconductedamongthecognitive
3、userssoastodetecttheappropriatewithoutnoticeablelossintheperformance[9].Itprimaryuseraccurately.However,whenthenumberofcognitivehasbeenclaimedthatidenticalbinaryquantization,i.e.,onebituserstendstobeverylarge,thebandwidthforreportingtheirquantization,performsasympt
4、oticallyoptimalasthenumbersensingresultstothecommonreceiverwillbeveryhuge.Inthispaper,weemployacensoringmethodwithquantizationofusersgoestoinfinity[10].However,whenthenumberoftodecreasetheaveragenumberofsensingbitstothecommoncognitiveradiosisverylarge,thetotalnumber
5、ofsensingreceiver.Bycensoringthecollectedlocalobservations,onlythebitstransmittedtothecommonreceiverisstillveryhuge.userswithenoughinformationwillsendtheirlocalonebitRecently,censoringsensorshaveattractedalotofattentionsdecisions(0or1)tothecommonreceiver.Theperform
6、anceofindecentralizeddetectionundercommunicationconstraintsspectrumsensingisinvestigatedforbothperfectandimperfectreportingchannels.Numericalresultswillshowthattheaverage[11],[12].Intheirsystems,onlythelikelihoodratios(LR)numberofsensingbitsdecreasesgreatlyattheexp
7、enseofalittlewithenoughinformationareallowedtosendtothecommonsensingperformanceloss.receiverviaperfectreportingchannels.However,in[11],thequantizationoftheLRwasnotconsideredandonlythecaseI.INTRODUCTIONofperfectreportingchannelwasstudied.In[12],althoughCognitiveradi
8、ohasbeenunderactiveconsiderationinthequantizationandimperfectreportingchannelsweretakenrecentyearstodealwiththeconflictbetweenthesteadyintoconside
