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1、西南交通大學(xué)碩士學(xué)位論文基于周期無碰撞區(qū)跳頻序列的自適應(yīng)跳頻系統(tǒng)研究姓名：黃建平申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：汪曉寧20090501西南交通大學(xué)碩士研究生學(xué)位論文第1I頁-I●-_●__●●_-__l_IIII-●_●ll_●lI_●lI-●lI-Il_I--I--I------I●Abs仃actBandcongestionproblemistheseriousprobleminthemodemciviliancommunications．Inthefrequency-hoppingcommunication，itsolvestheover-crow
2、dingproblemthattherealizationofmulti-usersharedfrequencyband．However,withnetworkcapacityincreasing，near-fareffectismoreandmoreserious．Inordertomeetnetworkperformancerequirements，itmustdealwiththeissueofmultipleaccessinterferenceinthefrequency—hoppingcommunication．Itisaself-interferences
3、ystemforFrequency-hoppingcommunicationsystemandinterferencebetweentheusersismoreserious．ffithappensonecollisionfor500jumps，thebiterrorprobability(BER)is10。．Itaffectsthequalityofcommunicationandevendisruptsthecommunicationforalargeamountofinformationlossing．hlthefrequency-hoppingcommunic
4、ations，inordertoovercomethemultipleaccessinterference(MAI)，therehasbeenanumberofways．Onewayistoresearchanddesignpracticalhoppingcodewithahammingcross-correlationaslowaspossible．Otherwayistoimprovethesystembytechnologyofeliminateorreduceinterference，whichincludesAdaptiveFrequencyHopping(
5、AFH)，CorrelatedHoppingEnhancedSpreadSpectrum(CHESS)andSOon．Thisthesiscombinesofthesetwowaystoimprovetheperformanceofanti．MAI．Firstofall，aNo—Hit．Zone0,,rrtz)hoppingcodewithalowcross．correlationischoosedthatonlyOCCULTSthefi'equencycollisionataparticulardisplacementofcycleandwillnotcollisi
6、onsinotherdisplacementofcycle．Then，accordingtothecharacteristicsofNo-Hit—Zone(卜mZ)hoppingcode，weproposetheNo．Hit-Zonehoppingcommunicationsystemdependsontheadaptivefi'equencyhoppingthinking．AnewadaptivefrequencyhoppingcommunicationsystemusingforNHZhoppingcodeWasstudied．Thepurposeistodoth
7、ebesttoreducethemultipleaccessinterferenceofsystem．西南交通大學(xué)碩士研究生學(xué)位論文第1II頁Inthisthesis，theauthorbuildstheadaptivefrequencyhoppingcommun-icationsystemsimulationplatformwithSIMULINKt001．Intheuser-definedmodulesoftheadaptivefrequencyhoppingcommunicationsystemsimulationplatform，Matlab
