ofdm系统中基于能量检测的频谱感知

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1、SpectrumSensingForanOFDMSystemusingEnergyDetectionMethodDEDICATIONThisthesisisdedicatedtoallpeoplenearorfarwhoparticipatesforthesuccessofthiswork,especiallymyfamilyandmycountrymateinchinafortheirsupportandencouragement.II万方数据MasterthesisABSTRACTWiththedevelopmentofthewirel

2、esscommunicationsystem,theneedofthespectrumgrowsaccordingly.Howeverthespectrumresourcehasbeentraditionallyallocatedtoafixedmanner,beingallunlicensedusersprohibitedfromtransmittingonalicenseduser’sspectrumband.Howevermostoftheallocatedspectrumisidledinsometimeandlocation.Th

3、eFederalCommunicationCommissionresearchreportrevealsthatseventypercentoftheallocatedspectrumisunderutilized.Forthisreasonanewtechnologyhasbeeninvestigatedtoallowunlicenseduserstoaccesstotheunusedspectrum.Cognitiveradioisanemergenttechnologyproposedoverthelastfewyearstoallo

4、wthereuseofthevacantspectrumwithoutcausinganyinterferencewiththelicenseduser.Spectrumsensingisthekeyenablingtechnologyincognitiveradiosystem.Withthedevelopmentofthemultimediawirelessapplicationwearefacingofaneedofhighdatarate.OrthogonalFrequencyDivisionMultiplexing(OFDM)is

5、adigitaltransmissionmethoddevelopedtomeettheincreasingdemandforhigherdataratesinwirelessmoderncommunications.Manydetectiontechniqueshasbeendevelopedintheliteratureforthespectrumsensingtechniqueinordertoallowunlicensedusertousethespectrumresourcewithoutcausinganyharmfulinte

6、rferenceforthesystem.Thosetechniquescanbedifferentintheirperformanceandtheapplicationsystem.Themaincontributionofthisthesisisanimplementationofaspectrumsensingtechniqueandevaluatestheperformanceofthattechnique.Thetechniqueusedhereistheenergydetection(ED)techniquebasedspect

7、rumsensingincaseofanOFDMcommunicationsystem.Keywords:Cognitiveradio,spectrumsensing,energydetection,OFDM.III万方数据SpectrumSensingForanOFDMSystemusingEnergyDetectionMethod详细中文摘要无线通信业务（如数据业务、语音业务、多媒体业务等）爆炸式的增长，从而使得无线频谱资源的需求快速加大，可用的无线频谱资源也变得越来越少，进一步导致了可用频谱资源与频谱需求之间的矛盾也日益突出，这种矛盾

8、严重的制约了整个无线通信业务的健康与快速发展。然而，频谱资源是无线通信最重要的资源，发展高效的频谱管理技术已经是迫在眉睫。现有的频谱分配主要采用固定分配频谱的方法，也就是将无线频