信道建模与仿真.ppt

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1、ModelingandSimulatingtheWirelessChannelsProf.LiPinganWuhanUniversityofTech.FlatfadingchannelmodelTwoclassicalsimulationmodelearlyR.H.Clarke,BellSyst.Tech.J.,1968W.C.Jakes,MicrowaveMobileComm.,1974ConventionalflatfadingmodelJakesmodelClarkeGaussiannois

2、efiltermodelM.Patzoldfadingmodelincellmobilecommunicationsystem2JakesmodelThesumofasetofsinusoidswithuniformlydistributiononphaseXXX+XXXX+X(N=4M+2)3JakesmodelwheredenotesthemaximalDopplerfrequency4ImprovedJakesmodelXXX+XXXX+X(N=4M+2)5ImprovedJakesmodel

3、wheredenotesthemaximalDopplerfrequency,areindependentrandomvariablesuniformlydistributedoverforalln.6GaussiannoisefilterThesumoftwoquadratureindependentGaussianrandomvariablesIndependentcomplexGaussianwhitenoisesourceIFFTIFFT7SuzukiprocessSuzukiprocess

4、isaproductprocessofaRayleighprocessandlog-normalprocessComplexGaussianGaussianRayleighLog-normal??8PDFandauto-correlationforJakespowerspectraldensityfunctionTheautocorrelationfunctionThemeanpowerof9Methodofequaldistances:Rayleigh-distribution10PDFandau

5、to-correlationforPowerspectraldensityfunctionTheautocorrelationfunction3dBcutoffF11Methodofequaldistances:Log-normaldistributionTolimittheF-region12SuzukiProcessSimulatorXXX+XXX+XXX+X+smXRayleighProcessLog-normalProcessSuzukiProcess13SimulationApproach

6、esforSuzukiProcess等距离法MethodofEqualDistances(MED)等面积法MethodofEqualArea(MEA)蒙特卡罗方法MonteCarloMethod(MCM)均方误差法MeanSquareErrorMethod(MSEM)14SimulationResultsbyusingMED瑞利过程仿真对数正态过程仿真器15理论值和仿真值比较Itcanbeseenthatthesimulationmodelcoincidesverycloselytothetheor

7、eticalmodel理论模型:16理论值和仿真值比较Itcanbeseenthatthesimulationmodelcoincidesverycloselytothetheoreticalmodel理论模型:17理论值和仿真值比较（相关函数）18Multi-pathsChannelModelTDL(Tap-Delay-Line)Modeltimetap1tap2tap3tap4XXXXRayleighFadingSimulatorRayleighFadingSimulatorRayleighFa

8、dingSimulatorRayleighFadingSimulatorTxRx19Questions!20