混沌直接序列扩频超宽带通信系统研究

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1、南京邮电大学硕士学位论文混沌直接序列扩频超宽带通信系统研究姓名：薛龙申请学位级别：硕士专业：电路与系统指导教师：蒋国平20060401南京邮电大学硕士研究生论文ABSTRACTAbstractUWBhastheadvantagesoffullyutilizationofbandwidthresources，highdatarates，simplesystemimplementation，lowpowerconsumption，theabilityofthrough·allcommunication，andhighprecisionlocalization．Asaresult，UWBhasman

2、ypotentialapplicationareas，suchaswirelessmultimedialocalareanetworks，wirelesssensornetworks，transportationsystems，andmilitarysystems．Asaphenomenonfoundinnon—lineardynamicsystem，muchattentionhasbeenpaidtochaosanditsapplications．ResearchersarestudyingitspossibleapplicationinUWBcommunication．Firstly，We

3、introducethebackgroundandforegroundofUWBandanalyzethecurrentproblemsintheoryandtechnique．ThenweanalyzeDS-UWBcommunicationsystemsandobtainnovelanalyticformulasforcalculatingbit—error-ratewithdifferentmodulations．Becausechaoticsequenceshavethepropertiesofgoodcorrelation，simplegenerationandrichcodeelem

4、entsanditmeetsthedemandofspread-spectrumsequence，chaoticsignalpossessesthecharacteristicofnoise-likewidebandsignal，whichissuitableforcommunication．Chaoticsignalissensitivetoinitialvalue，anditsauto—correlationfunctionandinter-correlationfunctionisapproachtothoseof占function，whichmakesitadapttomultiple

5、accesscommunication．Secondly,bymappinganalogchaossequenceintotwo-phasedigitalchaoticsequence，theenergyofsendingsignalandthecapabilityofanti-jammingincreaseandthebit·errorratedecrease．AnUWBmultiple-accesscommunicationssystembasedonchaoticspreadspectrumsequencesispresentedinthispaper，andtheperformance

6、ofmultiple—accessinterferenceandwhitenoiseinterferenceisanalyzedandanovelanalyticformulaforcalculatingbit—error-rateisobtained．Theresultsareverifiedbymeasurementsonsimulationsystem，showingthatitisfeasibletousetwo-phasedigitalchaossequenceinpractice．Keywords：Chaos；Multi-userinterference(MUI)；Ultrawid

7、e-bandwidth(U、ⅣB)；Pulse-positionmodulation；DirectsequencesspreadsrpectrumII南京邮电大学硕士学位论文摘要学科、专业：工学电路与系统研究方向：通信系统和网络中的控制技术作者：』塑级研究生薛龙题目：混沌直接序列扩频超宽带通信系统研究英文题目：StudyonUltrawide—bandwidthCommunicationSyste