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:1007-1482(2002)01-0040-05,(,710077),(VMF),:;M-ary;;TN914.1ASTUDYONTHEAPPLICATIONOFVIRTUALMATCHEDFILTERINSPREADSPECTRUMCOMMUNICATIONSYSTEMJIANGLei,GOUYan-xin(DepartmentofInformationCounterminingofTelecommunicationEngineeringInstitute,AirForceEngineeringUniversity,Xian710077,China)ABSTRACTBasedonthetraditionalhigh-speeddespreadinganddemodulatingschemeforM-arycommu2nication,theideathatmanydataflowscanbedespreadedatthesametimebyutilizingvirtualmatchedfilter(VMF)technologyispresentedinthispaper.Furthermore,thenewdespreadinganddemodulatingschemebasedonthisideaisalsointroducedandanalyzed.ResearchresultsshowedthatthisnewschemeisveryvalidfordespreadinganddemodulatingM-arycommunication.KEYWORDSSpreadspectrumcommunication(SSC);M-arycommunication;Virtualmatchedfilter:2001-06-18:(1974-),,,,;:1M-ary,,TDMACDMAM-ary,,,,(SAWF,DSP,FPGA),,,,22.12.1.1(VMF)11,,,,,SAWF()1SAWFSAWF,042002371CHINESEJOURNALOFSTEREOLOGYANDIMAGEANALYSISVol.7No.1Mar.2002SAWF,SAWFSAWF,,SAWF,SAWF,SAWF,SAWF(),SAWFSAWF1(f1,pn1)...(fm,pnm)SAWF1SAWF2.1.2,2,,,,(2),,22.23,,,();,SAWF,SAWF;,,SAWF,SAWF;,2.2.1[3];,,,2.2.2,,14200271:32.3M-ary,Mlog2MM,BPSK,f(f=/2,,;SAWF,f,10MHZ-200MHZ:S(t)=pn1(t)cos(t)(1)(),[4]:s(t)[cos(1t)+cos(2t)++cos(mt)](2)(1),pn1(t);(2),1,2,m,,1,2,m,:s1(t)=pn1(t)cos(0t)+pn1(t)cos[(0-)t]+pn1(t)cos{0-(m-1)]t}(3)(3),0=1-S1(t),SAWFSAWFMSAWF,SAWF,(3),0/2,(0-)/2,(0-(m-1))/2SAWF1pn1(t)cos(0t),SAWF2pn2(t)cos((0-)t),SAWFSAWF,y(t)y(t)=Ad(t)cos(2(f+f)t)(4)(4),fSAWF,fSAWFfSAWF:y0(t)=Rc(t)cos[2ft]-Rs(t)sin[2f](5)(5),Rc(t)=t/2-t/2A/2c(x)c3(t-x)cos(2fx)dxRc(t)=t/2-t/2A/2c(x)c3(t-x)sin(2fx)dx:t=0,SAWF,:|y0(t)|=1/2ANTc||=sin(fnTc)/fNTc,,,,:,SAWF1,SAWF:S2(t)=[pn1(t)cos(1t)pn1(t)cos(2t)]pn1(t)cos(mt)ª[h1(t)h2(t)hm(t)]T24200271=pn1(t)cos(0t)+n1+n3++nm(6)(6),ªh1(t)h2(t)pn1(t)cos(1t),pn2(t)cos(2t)SAWF1=0,2=0-,m=0-(M-1)pn1(t)pn1(t),n1,n2nmSAWFSAWFs2(t),:0/2,(0-)/2,(0-(m-1))/2,1SAWF1pn1,SAWFn2,n3nm(n2,n3nmpn1(t)),,(),2.4,,,,,,,,f,fi(f1,f2,),fI(f0,f0+,f0+2),,5:pf1-qf=fi:xfi=[(p-q)flfi+p]-11pqfl/fi12345678910111213141516P0112123123412341q1233444555566667f1/f212132/33/241/21252/53/44/35/21/311,,fI,x,3,MATLAB5.332m(M=5),(32)(1)(45),(),,4Time(Tb/8)()5Time(Tb/8)()34200271:4,,,6SAWF,DSPFPGA,DSPFPGA(DDC),Mb-ary(,),SAWF,,(,,),CDMA,(),,,:1CampbellCK.Applicationsofsurfaceacousticandshallowbulkacous2ticwavedevicesC.ProceedingsoftheIEEE,1989:1453-14842NanayakkaraS.HighspeedreceiverdesignsbasedonsurfaceacousticwavedevicesC.SixthInternationalConferenceOnDigitalSatelliteCommunications,1983:16-223RichardSW.SAWfiltersforCPSMspreadspectrumcommunicationsC.IEEENationalTelecommunicationsConference,1980:1-64,.M.:,19955.M.:,19936.M.:,1995(31)7(a);(b);(c),,,,,,,PaPr:1,,.J.(),1997;25(4):27-322,,.J.,2000;4(4):226-2293,.M.:,1988,85-894,,.M.:,1999,77-825.M.:,199044200271