802.11p物理层OFDM基带调制器的FPGA实现

2012090、、。。。(DSRC)。IEEE802.11p(WAVE)。IEEE802.11p(OFDM)(V2V)、(V2I)[1]。IEEE802.11p。IEEE802.11p2010802.11p。FPGA。。IEEE802.11pOFDMAlteraCycloneEP3C120F。1IEEE802.11p802.11a(V2V)、(V2I)802.11a。[2]。。802.11p802.11aPHY(RMS)MAC(CCH)(SCH)IP[3-4]。802.11pOFDMFPGA802.11pPhysicalLayertheOFDMBasebandModulatorFPGAImplementation,,611731WangLiang,HeZhi-ming(SchoolofElectronicEngineering,UniversityofElectronicScienceandTechnologyofChina,SichuanChengdu611731IEEE802.11p、。CycloneEP3C120FIEEE802.11pOFDM。IEEE802.11pOFDMFPGATP393A1003-0107(2012)09-0040-04Abstract:VehiclewirelesscommunicationssystemsbasedonIEEE802.11paspartoftheintelligenttransportationsystemwillimprovetransportsafety,efficiency,andreal-time.Thispaperdescribesthere-searchcontentofthekeytechnologiesofwirelesscommunicationsystemsinvehicles,andproposesaphysicallayerOFDMbasebandmodulationsystem,whichhassatisfactoryresultsandgoodportabilities,basedontheIEEE802.11pstandardsonCycloneEP3C120Fplatform.Keywords:IEEE802.11p;Vehiclewirelesscommunications;OFDM(OrthogonalFrequencyDivisionMulti-plexing);FPGA(Field-ProgrammableGateArray)CLCnumber:TP393Documentcode:AArticleID1003-0107(2012)09-0040-04(1984-)FPGA(1972-)。802.11pOFDMFPGA402012092IEEE802.11p2.1IEEE802.11p1(GI)。1.6μs802.11p(RMS)802.11p[2]。。,OFDM8μs(GI)OFDM6.4μs1/6.4μs=156.25kHz156.25kHz802.11a802.11p802.11a。802.11p52484。。802.11p71/2(ConvolutionalEncoding)1/2(Puncturing)1/22/33/4。BPSK、QPSK、16QAM64QAM43～27Mb/s。2.2IEEE802.11p。BPSK、QPSK、16-QAM64-QAM1/2、2/33/43Mb/s27Mb/s。1。IEEE802.11p1。()、SIGNAL、DATA、IFFT、、。。MAC802.11pOFDM(PPDU)DARF。3IEEE802.11pFPGA3.1、OFDM[5]。IFFT。IEEE802.11BPSKQPSK16QAM64QAM1/22/33/4/(Mb·s-1)3,4.5,6,9,12,18,24,2752OFDM8μs(GI)1.6μs32μs156.25kHz10MHzK=71IEEE802.11p2SIGNAL802.11pOFDMFPGA1IEEE802.11P41201209ROM。。ROM166416bits88。3.2SIGNALSIGNALLENGTHRATE。24bits1/2、、BPSKSIGNALIFFTOFDM。2SIGNAL。2CLK_G、ASY_CLRDATA_VALIDSIG-NAL_VALIDSIGNALSIGNALLENGTHRATE。3.3DATADATASIGNAL、。DATA(3)PSDU1/21/2、2/33/4BPSKQPSK16QAM64QAM。3.4IFFTIFFT802.11pFFTIFFT。QuartusII9.1FFTMegaCoreFFT/IFFTIP、。64IFFTFFTFFT16bitsIFFTDATA、SIGNAL8l、Q64bits16。3.564RAMIFFTRAMFIFO、。OFDMOFDM64。,OFDM80。FPGAOFDMOFDM。3.6IEEE802.11pMAC。。MAC。4。4IEEE802.11pIEEE802.11p。PHYFPGAVLSI。OFDMIEEE802.11p、3DATA4802.11pOFDMFPGA42201209RF5SCOMtskinputtskoutputtskencoder,tskdecoder。MAINBIOS,MAINBIOS3。3SCOMSCOMSCOMSCOM。SCOM_getMsgSCOM_putMsg。6。3TSDSPmemory8TSSDRAM0x804DBC88(47404510)TS47TS40TSPESPESTS0TSPID45PIDTS。1880x47,0x00TSPID0x45。1880x47。TS。4TMS320DM642DSP/BIOS。[1],,.802.11b[J].,2005,21(2):28-30.[2].[J].,2006,(7):12-14.[3],,.[J].,2007,(2):76-78.AlteraCy-cloneEP3C120F。IP、。802.11pIEEE802.11p。[1]IEEEStd.802.11-2007,AmendmentoftheCommission'sRulesRegardingDedicatedShort-Range[R].Communica-tionServicesinthe5.850-5.925GHzBand[S].[2]ANDRISANOO,CHIANIM,FRULONEM,etal.Propaga-tionEffectsandCountermeasuresAnalysisinVehicletoVehicleCommunicationatMillimeterWaves.Proc.42ndIEEEVehicularTech.Conf,Denver,CO,pp.312-316,May1992.[3]IEEEStd.802.11-2007,Part11:WirelessLANMediumAccessControl(MAC)andPhysicalLayer(PHY)Specifica-tions[S].[4]IEEEP802.11pTM/D3.0.DraftStandardforInformationTechnology-Telecommunicationsandinformationex-changebetweensystems-Localandmetropolitanareanet-worksSpecificrequirements-Part11:WirelessLANMedi-umAccessControl(MAC)andPhysicalLayer(PHY)speci-ficationsAmendment7:WirelessAccessinVehicularEn-vironments.July2007.[5],.OFDM[M].:,2003.36802.11pOFDMFPGA43