基于cofdm技术的高速数字载波通信实现0引言1cof

1COFDM20052606:,,OFDM()COFDM()DSP-TMS320VC5410MCOFDMDSPRealizationofHighSpeedDigitalCarrierCommunicationbyCOFDMTechnologyAbstract:OrthogonalFrequencyDivisionMultiplexingtheoryanditscodingtechnologyisintroducedinthispaper.TheadvantageofusingCOFDMmodulatingtechnologyinpowercarrierwavecommunicationisanalyzed.Themoduledesignbasedon16-bitfixedpointDSP-TMS320VC5410isputforward,andthenewhigh-speeddigitalcarriermoduleusingCOFDMtechnologyrealizedbyhardwareandsoftwareisanalyseddetailed.KeyWords:COFDM;DPLC;DSPOFDM206080OFDM,N2,N,,,,d0d1…dN-1—NT∆tN∆tNf0f1…fN-1fc1/TNTnffcn/+=n=01…N–11mOFDM])(Im[2sin])(Re[2cos])(Re[)(10/210/2102∑∑∑−=−=−=⋅−⋅==NnTntjcNnTntjcNntfjmenXtfenXtfenXtxnπππππt[(m-1)T,mT]2y(t)=∑−=10/2)(NnTntjenXπ]0[Tt∈OFDMTy(t)fs=1/tt=T/NNt=ktnt/T=nk/N∑−==10/2)()(NnNnkjenXkyπ0≤k≤N-133{X(n)}NIDFTIDFTOFDMDFTOFDMIDFTDFTOFDMOFDM1.40kHz500kHzOFDM1~2Mbps2.OFDM3.OFDM4.(COFDM)OFDMFECS/NRSReed-SolomonTCMTrellisCodedModulationTCM3RSRSTCMTCM3-6dB[2]/OFDMRSRSRS(N,K)s(N=2s-1)t2t=N-KRS(255,223)1616×8RS1COFDM[3]10-5RS/TCM-32QAM()TCM-32QAM()4dBRS-TCMCOFDMOFDMM-QAM()40kHz—500kHz32-QAM2.3Mbit/s12.140kHz500kHzAB60kHz260kHz280kHz480kHz20kHz200kHz4kHzN5032-QAMOFDMT20%50*log2(32)/T/(1+20%)0.833Mbps1.67Mbps2.2423CPLD()CPLDFPGAIP(IntellectualProperty)RSDSP2.3DSPDSPTCMRSIPCPLDDSPRSDSPDSPCCS(CodeComposerStudio)CCCC533IFFTTCM250us100usC70usCDSPCOFDM[1],OFDM[J],2001,8,pp65-68[2],(TCM)[J],2001,12,pp84-87[3]COFDMDSP2004[4]TMS320VC5410Fixed-PointDigitalSignalProcessor[Z],LiteratureNumber:SPRS075E,TI,2000[5JohnG.Prokis,DigitalCommunicationsFourthEdition[M],2001,McGrawHillPress,pp552-541