智能交通系统中移动宽带无线接入技术的应用

©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:2008-04-1025620086:1006-9348(2008)06-0254-03,(,,,,710072):,,,Jake802120,,IEEE802120:;;;:TB24:BApplicationofMobileBroadbandWirelessAccessTechnologyinIntelligentTransportationSystemsZHANGShi,ZHANGYi(SchoolofElectronicInformation,NorthwesternPolytechnicalUniversity,XipanShanxi,710072)ABSTRACT:Concerningtheincreasingneedsofmultimediacommunicationinthesituationofhigh-speedstateandtheestablishmentofcommunicativeplatformbasedonintelligenttransportationsystem(ITS),byapplyingthecharacteristicsofmobilebroadbandwirelessaccesstechnology,andbearinginmindthecommunicativeneedsofITS,theapplicationofmobilebroadbandwirelessaccesstechnologyinthefieldofintelligenttransportationisdiscussed.AccordingtotheJakesimulationmodelandparametersofIEEE802120standards,asimulationexperimentforinves2tigatingtheperformanceofthechannelmodelswiththestateofhigh-speedmovementiscarriedout.Thebiterrorratesofmobilechannelsarewellcontrolledinthesimulation,andtheresultsindicatethatitiseffectiveandfeasibletoestablishITScommunicationplatformthroughIEEE802120-basedmobilebroadbandwirelessaccesstechnology.KEYWORDS:Intelligenttransportationsystem;Mobilebroadbandwirelessaccesstechnology;Orthogonalfrequen2cydivisionmultiplexing;Mobileinternetprotocol1(IntelligentTransportationSystem,ITS),,,[1],,,,,,,,,,,,,,,,,[2]452©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[3]2002,IEEE802IEEE802120(MBWA),(20ms),,250km/h1Mbit/s,,,WLAN[4][5]802.20(OFDM),,MACOFDM(),,,OFDM,,,,[6]11OFDMOFDM,OFDM,(PSK)(QAM),N,TOFDM,di(i=0,1,),fc,rect(t)=1,tT2,t=tsOFDM:s(t)=Re{N-1i=0direct(t-ts-T/2)exp[j2(fc+i/T)(t-ts)]}tstts+T(1)s(t)=0ttstT+ts(2)OFDMIDFT/DFT,FFTDFT,OFDMNIDFT,,,,IDFT,,DFT:DFT:X(k)=1NN-1i=0x(i)exp(-j2iNk)0kN-1(3)IDFT:x(i)=1NN-1k=0X(k)exp(j2kNn)0nN-1(4)3,MATLAB710OFDM,IEEE802120,Vehicular-AVehicular-B[7]0,10dB,JakeClarke,N,:g(t)=E0Nn=1Cnexp[j(wdtcosn+n)](5),E0,Cn,n,n,wdn=05:Cn=1N(6)n=2nN,n=1,2,,N(7)n=0,n=1,2,,N(8)Jakes552©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(t)=uc(t)+jus(t)(9)uc(t)=2NMn=0ancos(wnt)(10)us(t)=2NMn=0bncos(wnt)(11),N=4M+2,:an=2cos0,n=02cosn,n=1,2,,M(12)bn=2sin0,n=02sinn,n=1,2,,M(13)n=4n=0nMn=1,2,,M(14)wn=wd,n=0wdcos2nN,n=1,2,,M(15),,Reed-Solomon[8][9]-1AB1A(ns)A(dB)B(ns)B(dB)12345603107101090173025100-110-910-1010-1510-201003008900129001710020000-2150-1218-1010-2512-1610JakeJakeJakeJakeJakeJake,,,AB(BER)-(Eb/No),(FdTs),215GHz23IEEE802120,OFDMAWGN(),OFDM,,,,,,,,OFDMIEEE802120,Jake,234IEEE802120IP,,IPIPIP,IP,,IP[10],IPv4,,128IPv6IPv4,,IPv6IPv4,(260)652©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:[1],,.[M].:,1999,(1):115.[2],,,.[J].,2006,22(6):89-93.[3].[J].(),2004,36(2):134-137.[4],.[J].,2005111:55-56.[5]SRoychowdhury.Fuzzycurvefittingusingleastsquareprinciples[C].IEEEInternationalconferenceonsystems,manandcyber2netics,1998,4:4022-4027.[6],.[J].,2004-91159-163.[](1982-),(),,:(1978-),(),,:C3I:(1945-),(),,,:(256),,,IPv4IPv6IP,,IPv6,,,,,IPv6,5IP,,,,,:[1][].[M]..:,2002:182-191.[2]LarsWolf,MarcBechler,SvenJaap.PotentialsandTechnologiesofMobileInternetforTransportation[C].ProceedingsoftheITSTelecomunication,France,2005.[3].[M].:,2003,.[4],.IEEE802.20[J].,2003,(9):56-58.[5].[M].:,2000,.[6]P.H.Moose.AtechniqueforOFDMfrequencyoffsetcorrection[J].IEEETrans.Comet,October,1994.[7]Draft802.20PermanentDocument,ChannelModelforIEEE802.20MBWASystemSimulation[S],IEEE,Nov6,2003.[8]G.D.Forney,Convolutionalcodes,partI:algebraicstruc2ture,[J]IEEEtrans.OnInfo.Theo,IT-16,pp720-738No2vember1970.[9]G.L.FengandK.K.Tzeng,AgeneralizationoftheBerlekamp-Masseyalgorithmformultisequenceshiftregistersynthesiswithapplicationstodecodingcycliccodes,[J]IEEETrans.Info.Theo,Vol.37,pp.1274-1287,Sept.1991.[10],.IP[M].:,2003,.[](1983.4-),,,,,(1958-),,,,,062