基于空时分组码的多输入多输出系统仿真实现

ELECTRONICMEASUREMENTTECHNOLOGY295200610(30072):,MATLAB,,:;;MATLABRealizationofMIMOsystemsimulatorbasedonspace2timeblockcodeLiuChaoyangShenBaosuoFuXiaomei(SchoolofElectronicInformationEngineering,TianjinUniversity,Tianjin30072)Abstract:Codinganddecodingprincipleofspace2timeblockcodeareintroducedandMATLABsimulationcodeisgiventorealizecoderandencoderofSTBC.TheperformanceofSTBCissimulated.TheresultshowsthatSTBChasgoodperformanceoftransmissiondiversityandreceivingdiversity.Keywords:STBC;MIMO;MATLAB0,,MIMO,,,,WCDMA1knTPPr=k/pk=2,P=2.21,k,2kkk,,k,kM=2k,,12,12210s0,1s1,-s310,1s302t54129h0h12,,2(tt+Tr0r1):r0=r(t)=-h0s0+h1s1+n0(1)r1=r(t+T)=-h0s31+h1s30+n1(2):n0,n1,2,,h0h1:„s0=h30r0+h1r31,„s1=-h0r31+h31r0(3)h0=a0ej0,h1=a1ej0(1)(2)(3):„s0=(a20+a21)s0+h30n0+h1n31(4)„s1=(a20+a21)s1+h0n31+h31n0(5)(4)(5),s0s1,^s0^s1,(^s0,^s1),:^s0=argmin^s0Sd2(„s0,^s0),^s1=argmin^s1Sd2(„s1,^s1)(S)2MATLAB2.12,,mimo_spt,2y1y2,MATLAB:functionst=mimo_spt(y1,y2)m1=y1;m2=y2;m3=-conj(y2);m4=conj(y1);st=[m1,m2,m3,m4];2.21,0,1,BPSK,x1=exp(j3pi35/4)x2=exp(j3pi/4),1mimo_channel0,varmimo_decoder(var),var:functiondc=mimo_decoder(var)fault=0;x1=exp(j3pi35/4);x2=exp(j3pi/4);fort=15000mimoh=mimo_channel(1,2,t);h1=mimoh(1);h2=mimoh(2);u=mimo_spt(x1,x2,t);s1=u(1);s2=u(2);s3=u(3);s4=u(4);randn(’seed’,t)r1=h13s1+h23s2+normrnd(0,var)+j3normrnd(0,var);r2=h13s3+h23s4+normrnd(0,var)+j3normrnd(0,var);x11=conj(h1)3r1+h23conj(r2);x22=conj(h2)3r1-h13conj(r2);ifabs(x11-x1)abs(x11-x2)fault=fault+1;endifabs(x22-x2)abs(x22-x1)fault=fault+1;endendc=faultber=fault/10000;dc=ber;3MIMO,Jakes[1]3km/h,5.56305,0,0.55,MIMO3BPSK641:53BPSK4BPSKQPSK,2134,,,;BPSK,QPSK44Jakes,,,,[1].[M].:,2003.[2].[M].:,2004.[3],,,.[J].,2003,30(5):6342639,662.[4],.[J].,2004,30(6):51253.[5],.[J].,2003,24(10):36239.[6],,.MIMO[J].,2004(3).(144)(Flooding),[6]ZigBee(ChipconASCC2420)(MCU),,,7,CC2420ARMPCPC;ARM,CC2420;ARMZigBee74ZigBeeHelicomm()IP2LinkZigBee,ZigBeeZigBeeTUVZigBee,[1]ZigbeeAlliance.ZigBeeSpecification(Version1.0)[S].2005.[2],.ZigBee[J].,2005,31(6):123.[3],,.ZigBee[J].,2005,26(6):529.[4],.ZigBee[J].,2004(6):33235.[5]IEEEStandards802.15.4TM22003,Wirelessmediumaccesscontrol(MAC)andphysicallayer(PHY)specificationsforlow2ratewirelesspersonalareanetworks(LR2WPANs)[S].[6],,,.[J].,2004,30(8):123821241.741