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1、展頻通訊原理(技職92版)PrinciplesofSpreadSpectrumCommunication林福林南台科技大學電子工程學系中華民國九十二年五月STUTEELin1STUTEELin2主要參考書籍1.J.K.Holmes,“CoherentSpreadSpectrumSystems”,1982,JohnWiley&Sons,Inc.其他參考書籍1.S.Haykin,“CommunicationSystems”,2000,JohnWiley&Sons,Inc2.J.Viterbi,“CD
2、MA-PrinciplesofSpreadSpectrumCommunication”,1995,Addison-WesleyPublishingCompany.3.R.C.Dixon,“SpreadSpectrumSystemswithCommercialApplications”,1994,JohnWiley&Sons,Inc.4.D.J.Torrieri,“PrinciplesofMilitaryCommunicationSystems”,1981,ArtechHouse,Inc.5.M.
3、K.Simon,J.K.Omura,R.A.ScholtzandB.K.Levitt,“SpreadSpectrumCommunications”,1985,6.R.E.Ziemer,R.L.Peterson,“DigitalCommunicationsandSpreadSpectrumSystems”,1985,7.J.C.LibertiandT.S.Rappaport,“SmartAntannasforWirelessCommunications:IS-95andThirdGeneratio
4、nCDMAApplications”1999,PrenticeHall,Inc.8.W.W.PetersonandE.J.Weldon,“Error-CorrectingCode”,1972.STUTEELin3目錄：第一章展頻通訊原理簡介p1-32第二章虛擬隨機序列和金氏碼第三章展頻碼之同步(獲取與追蹤)第四章展頻通訊之性能分析第五章展頻通訊的例子STUTEELin4第一章展頻通訊原理簡介1.1Definitionandbenefits:1.Spreadspectrumisameansoftr
5、ansmissioninwhichthedatasequenceoccupiesabandwidthinexcessoftheminimumbandwidthnecessarytosendit.2.Thespectrumspreadingisaccomplishedbeforetransmissionthroughtheuseofacodethatisindependentofthedatasequence.Thesamecodeisusedinthereceivertode-spreadthe
6、receivedsignalsothattheoriginaldatasequencemayberecovered.**FHSS:Bluetooth,IEEE802.11,…DSSS:IS-95,cdma-2000,W-CDMA,IEEE802.11b,GPS,TRC-4,…THSS:UWB,…STUTEELin1展頻通訊的優點包括：1.對人為的刻意干擾(Jamming)訊號有良好的抵禦能力。2.通訊過程被截收的可能性較低。3.具有簡單的保密通訊能力。4.利用此技術可完成分碼多工通訊。5.可以改
7、善多路徑干擾所造成通訊品質惡化的現象。STUTEELin21.2虛擬隨機序列Pseudo-randomsequencesApseudo-noise(PN)sequenceisaperiodicbinarysequencewithanoise-likewaveformthatisusuallygeneratedbymeansofafeedbackshiftregister,ageneralblockdiagramofwhichisshowninFigure1.1.Fig.1.1Feedbacksh
8、iftregister.STUTEELin3Afeedbackshiftregisterconsistsofanordinaryshiftregistermadeupofmflip-flopsandalogiccircuitthatareinterconnectedtoformamultiloopfeedbackcircuit.Theflip-flopsintheshiftregisterareregulatedbyasingletimingclock.ThePNsequencesogenera
