移动通信网络中的ip电话语音质量的仿真方法

189©Vol.18No.920069JournalofSystemSimulationSept.,2006•2559•IP100876IPVoIPVoIPGilbertMOSPESQcdma20001xIPVoIPMOSPESQVoIPTN929A1004-731X(2006)09-2559-04SimulationMethodologyforSpeechQualityofVoIPinMobileCommunicationNetworksZHANGJian-ming,YANGDa-cheng(SchoolofElectronicEngineering,BeijingUniversityofPostsandTelecomunication,Beijing100876,China)Abstract:AsimulationframeworkforVoIPspeechqualityinwidebandmobilecommunicationsystemswasintendedtooutline,whichiscomposedofwirelesslinksimulation,systemperformancesimulationandspeechqualitysimulation.Therehasbeenafocusonpacketspeechqualitysimulation.Intheproposedsimulation,theGilbertmodelisusedtosimulatethepacketsdroppedandPESQalgorithmisforcalculatingMOSofspeech.AsimulationexampleofVoIPincdma20001xnetworkswascarriedout.Theresultsdemonstratetherelationshipbetweenpacketlossrate,bustypacketloss,terminalnumberandspeechquality.Keywords:MOS;PESQ;VoIP;speechquality;mobilecommunication;packetswitch1[1]QoSIPIPIP1IP[2]2005-07-042005-10-211976-1951-MOSMOS5MOS5MOSMOS[3]MOSMOSITUPESQ[4]cdma2000EVRC[5]WCDMAAMR[6]CDMACDMA189Vol.18No.920069Sept.,2006•2560•IPVoIP11VoIP2(Eb/No)(BER)(FER)IPPESQMOSVoIP[7~9]3GIPIPIPUDPUDPUDPRTPUDPVoIPRTP/UDP/IP2VoIP3RTPUDPIPRTPUDPIPPPPPPP23GVoIP10-30ms[10]wav3PESQMOS3VoIP2Gilbert[11]4Gilbert01pq11ppqq−⎡⎤=⎢⎥−⎣⎦P10λ−=PE(1)λ1=q-pλ2=1121,11pqαα⎛⎞⎛⎞==⎜⎟⎜⎟−⎝⎠⎝⎠(1)1−=PHΛH()11220,0λααλ⎛⎞==⎜⎟⎝⎠HΛn()1nnn−==⋅⋅PPHΛH()11lim11nqpnqppq→∞−⎛⎞=⎜⎟−+−⎝⎠P2189Vol.18No.920069IPSept.,2006•2561•2ploss1losspppq=+−011-qpq1-p4Gilbert3cdma20001xIP195161232m1.5m1.9GHzHata23dBm8.9dB0.5-174dBm/HzChannelModelA[7]127456910188193171615141312115VoIPVoIPMOSGilbertqP.86226wav8kHz16-bitPCM8506MOS6VoIP5[12]IP7qGilbertMOS7qMOS84043.532.521.5MOS(PESQ)00.050.10.150.20.250.30.3500.050.10.150.20.250.30.353.63.22.82.42.21.8MOS(PESQ)189Vol.18No.920069Sept.,2006•2562•8MOS4IPcdma20001xVoIPIPIP[1]HolmaH,ToskalaA.WCDMA[M].(3)..:,2005.[2]JansenJ,VleeschauwerDD,BuchliM,PetitGH.Assessingvoicequalityinpacket-basedtelephony[J].IEEEInternetComputing(S1089-7801),2002,6(3):48-56.[3]ZhaW,ChanWY.Voicequalityassessmentusingclassificationtrees[C]//ConferenceRecordoftheThirty-SeventhAsilomarConferenceonSignals,SystemsandComputers.2003,(1):537-541.[4]RecommendationITU-TP.862.PerceptualEvaluationofSpeechQuality(PESQ):AnObjectiveMethodforEnd-to-EndSpeechQualityAssessmentofNarrow-BandTelephoneNetworksandSpeechCodecs[S].Feb.2001.[5]3GPP2C.S0014-0.EnhancedVariableRateCodec(EVRC)[S].Dec.1999.[6]3GPPTS26.071.AMRSpeechCodec;GeneralDescription[S].Dec.2004.[7]3GPP2C.R1002-0.cdma2000EvaluationMethodology[S].Dec.2004.[8],.[J].,2003,15(4):568-571.[9],.[J].,2001,29(4):464-470.[10],,.[M].:,1995.[11]JiangW,SchulzrinneH.QoSMeasurementofInternetReal-TimeMultimediaServices[EB/OL].(Dec.1999)[May2005].~wenyu.[12]TheodoreSR.WirelessCommunicationsPrinciplesandPractice[M].:,1998.2487SAMPSO122.18%;226.42%321.3%7,(SAMPSO)VRPMPSOSASAMPSO,,SAMPSO:[1]CNRedwine,DAWismer.Amixedintegerprogrammingmodelforschedulingorderinsteelmill[J].JournalofOptimizationTheoryandApplications(S0022-3239),1974,305-318.[2]SSato,TYamaoka,YAoki,TUeda.Developmentofintegratedproductionschedulingsystemforironandsteelworks[J].InternationalJournalofProductionResearch(S0020-7543),1977,15:539-552.[3]LXTang,JYLiu,AYRong,ZHYang.AmultipletravelingsalesmanproblemmodelforhotrollingschedulinginShanghiBaoshanIron&SteelComplex[J].EuropeanJournalofoperationalResearch(S0377-2217),2000,124:267-282.[4]JKennedy,REberhart.Particleswarmoptimization[C]//Proceedingofthe1995IEEEinternationalconferenceonneuralnetwork.1995:1942-1948.[5]YShi,REberhart.Empiricalstudyofparticleswarmoptimization[C]//Proceedingsofcongressonevolutionarycomputation.1999:1945-1950.[6]SYYang,MWang,LCJiao.Aquantumparticleswarmoptimization[C]//EvolutionaryComputation,CEC2004,2004,1:320-324.[7]WJXia,ZMWu.Aneffectivehybridoptimizationapproachformulti-objectiveflexiblejob-shopschedulingproblems[J].Computers&IndustrialEngineering(S0360-8352),2005,48:409-425.