www.gusucode.com > ZBLAST算法仿真源码程序 > ZBLAST算法仿真源码程序/131014135Pro/vblastpic11.m
% vblastpic11.m %比较MMSE-PIC和MMSE-OSIC的性能 tx=2;rx=2;L=30000;Modulation='BPSK'; SNR=[0:2:20]; A=randint(tx*L,1); X=zeros(tx,L); for k=1:tx X(k,:)=(-1).^(A(k:tx:end)+1); end H=sqrt(1/2)*(randn(rx,tx,L)+i*randn(rx,tx,L)); n=sqrt(1/2)*(randn(rx,L)+i*randn(rx,L)); R=zeros(rx,L); for k=1:L R(:,k)=sqrt(1/tx)*H(:,:,k)*X(:,k); end %MMSE-PIC=================================================================== bermp11=[]; bermp22=[]; for m=SNR m snr=10^(m/10); R_noised=R+sqrt(1/snr)*n; x=[]; a=zeros(tx*L,1); %第一遍检测 for t=1:L r=R_noised(:,t); HH=H(:,:,t); xtemp=zeros(tx,1); w=inv(HH'*HH+(1/snr)*eye(tx))*HH'; y=w*r; xtemp=(y>=0)-(y<0)+0; x=[x,xtemp]; end for k=1:tx a(k:tx:end)=(x(k:tx:end)+1)/2; end [errbit,temp_ber]=biterr(A,a); bermp11=[bermp11,temp_ber]; %第二遍PIC检测 xx=[]; for t=1:L r=R_noised(:,t); G=pinv(H(:,:,t)); for k=1:tx y(k)=H(:,k,t)'*(r-sqrt(1/2)*H(:,:,t)*x(:,t)+sqrt(1/2)*x(k,t)*H(:,k,t)); end xxtemp=(y>=0)-(y<0)+0; xx=[xx xxtemp]; end for k=1:tx a(k:tx:end)=(xx(k:tx:end)+1)/2; end [errbit,temp_ber]=biterr(A,a); bermp22=[bermp22,temp_ber]; end %MMSE-SIC================================================================= bermss=[]; for m=SNR m snr=10^(m/10); R_noised=R+sqrt(1/snr)*n; x=[]; a=zeros(tx*L,1); for t=1:L r=R_noised(:,t); HH=H(:,:,t); G=pinv(HH); S=[1:tx]; xtemp=zeros(tx,1); for k=1:tx [wki,ki]=minnorm(G); w=inv(HH'*HH+(1/snr)*eye(tx-k+1))*HH'; y=w(ki,:)*r; xtemp(S(ki))=(y>=0)-(y<0)+0; r=r-sqrt(1/tx)*xtemp(S(ki))*H(:,S(ki),t); HH(:,ki)=[]; S(ki)=[]; G=pinv(HH); end x=[x,xtemp]; end for k=1:tx a(k:tx:end)=(x(k:tx:end)+1)/2; end [errbit,temp_ber]=biterr(A,a); bermss=[bermss,temp_ber]; end %========================================================== figure semilogy(SNR,bermp11,'o- b'),hold on semilogy(SNR,bermp22,'s- r') semilogy(SNR,bermss,'p- g'),grid on legend('MMSE','MMSE-PIC','MMSE-SIC') xlabel('SNR(dB)'); ylabel('误比特率'); title('tx=2,rx=2,MMSE-PIC,MMSE-OSIC检测性能')