小波變換在直擴(kuò)系統(tǒng)擴(kuò)頻碼捕獲中的應(yīng)用研究.pdf

1、分類號UDC密級編號工學(xué)碩士學(xué)位論文Y7800小波變換在直擴(kuò)系統(tǒng)擴(kuò)頻碼捕獲中的應(yīng)用研究碩士研究生：指導(dǎo)教師：學(xué)位級別：學(xué)科、專業(yè)：所在單位：滄文提交日期：論文答辯日期：學(xué)位授予單位：岳瑾郭黎利教授_J_學(xué)碩士通信與信息系統(tǒng)信息與通信工程學(xué)院2004年12月2005年1月哈爾濱工程大學(xué)哈爾濱上挫人學(xué)碩學(xué)位論文ABSTRACTThedirect—sequencespread—spectrum(DS／SS)techniquehasbeenap

2、pliedformobilecommunication，telemetryandorinentetion，radarsystemsinceitoffersmanyadvantagesincludingantieavesdropping，anti—interference，multipleaccess，AnditisalsothemostconuTIOllmeansofspreadspectrumIntheDS／SSsystem，itis

3、theresearchemphasistoacquireandkeepthesynchronizationbetweenthelocalcodesignalandthereceivedsignalOntheotherhand，wavelettheoryhasbecomemoreandmoreperfectsincetheeightiesofthetwentiethcenturyandgainedgreatdevelopmentinman

4、yfieldwithitspopularizationWavelettheoryprovidespowerfulinstrumentforsignalprocess，andtherearepracticalapplicationincommonfiltering、noisereductionandsingularitydetectionAsanewmultiresolutionmeans，waveletCaneffectivelydis

5、tillthemessagefromsignalandCandetectthetransientsignalrapidlyandexactlySothispaperstudyheavybycombiningthewavelettransformwithspread—spectrumcodedetectionandacquisitionofthesynchronizationtechnologyThispaperstudythePNcod

6、eacquisitionsystembasedonthecharacteristicofwaveletmultiresolutiondetectionbyusingtheadvantageofwavelettransformintransientsignaldetectionandaimingatthecharacteristicofacquiredmodulatedsignalandnon—acquiredwhiteGaussiann

7、oisesignalAndcalculatethefiltercoefficientofquadraticperpendicularB—splinewaveletaccordingaswaveletanalysistheoryandBsplinefunctioncharacteristicAtthesametime，comparetheresultofdetectionusingBsplinewaveletwitlthatofBattl

8、eLemariewavelet。andtheresultindicatethattheBsplinewaveletismuchbetterinthissystemAnalysizetheperformanceofthisacquisitionsystemanddiscusstheworkflowandcalculatesomeimportantparameterssuchasaverageacquisitiontimeandSOonTh