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ID:33945827
大小:1.86 MB
页数:49页
时间:2019-03-01
《ofdm系统中基于能量检测的频谱感知》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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