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1、ThisfulltextpaperwaspeerreviewedatthedirectionofIEEECommunicationsSocietysubjectmatterexpertsforpublicationintheIEEEINFOCOM2009proceedings.CooperativeRelayforCognitiveRadioNetworksJunchengJia,JinZhangandQianZhangDepartmentofComputerScienceandEngineeringHongKongUniversityof
2、ScienceandTechnologyEmail:{jiajc,zjzj,qianzh}@cse.ust.hkAbstractCognitiveradiohasbeenproposedinrecentyearstopromotethespectrumutilizationbyexploitingtheexistenceofspectrumholes.TheheterogeneityofbothspectrumavailabilityAP[1,3,4]APandtraf?cdemandinsecondaryusershasbroughtsi
3、gni?cantchallengeforef?cientspectrumallocationincognitiveradio150Kbps50Kbps[1][3]networks.Observingthatspectrumresourcecanbebettermatchedtotraf?cdemandofsecondaryuserswiththehelpofS1[1,2]S2[2,3,4]S1S2relaynodethathasrichspectrumresource,inthispaperweexploitanewresearchdire
4、ctionforcognitiveradionetworks(a)Channelanddemand.(b)OFDMAtransmission.byutilizingcooperativerelaytoassistthetransmissionandimprovespectrumef?ciency.Aninfrastructure-basedsecondarynetworkarchitecturehasbeenproposedtoleveragerelay-assistedAPAPdiscontiguousOFDM(D-OFDM)fordat
5、atransmission.Inthisarchitecture,relaynodewillbeselectedwhichcanbridgethe[1][3,4][1]sourceandthedestinationusingitscommonchannelsbetweenthosetwonodes.Withtheintroductionofcooperativerelay,manyuniqueproblemsshouldbeconsidered,especiallytheissueforS1S2S1[2]S2relayselectionan
6、dspectrumallocation.Weproposeacentral-(c)Cooperativerelaytransmission(leftintimeslot1,rightintimeslot2).izedheuristicsolutiontoaddressthenewresourceallocationproblem.TodemonstratethefeasibilityandperformanceofFig.1.AnExampleforthedemandimprovementusingcooperativerelaycoope
7、rativerelayforcognitiveradio,anewMACprotocolhasforcognitiveradionetwork.beenproposedandimplementedinaUniversalSoftwareRadioPeripheral(USRP)-basedtestbed.Experimentalresultsshowthatthethroughputofthewholesystemisgreatlyincreasedbyexploitingthebene?tofcooperativerelay.ingwor
8、ks[4]–[7].However,whenthetraf?cdemandandspectrumresourceavailabilityarelargelymismatched,
