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GenPNoQ.m
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GenPNoQ.m
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function [ p,px ] = GenPNoQ(SNR,K,M,N,method)
%K=20;
%M=32;
%N=40;
iteration = 100;
tempP=zeros(16);
tempPx=zeros(4);
for iter = 1:iteration
sum1=zeros(K,M);
sum2=zeros(M,M);
sum3=zeros(M,K);
sum4=zeros(K,K);
a=randi([0 1],2*K,1);
cnt=zeros(16);
cntx=zeros(4);
a=a*2-1;
x=modulate(a)';
H=normrnd(0,1,M,K)+j*normrnd(0,1,M,K);
Pt=(sum(abs(x).^2))/K;
sigma=Pt*10^(-SNR/10);
n=normrnd(0,sqrt(sigma),M,1) + j*normrnd(0,sqrt(sigma),M,1);
r=sqrt(Pt)*H*x+n;
y=r; %ûÓÐÁ¿»¯
%%ÇóAµÄ·½·¨
switch(method)
case 1 %LS
for i=1:N
b=randi([0 1],2*K,1);
b=b*2-1;
xn(:,i)=modulate(b)';
rn=sqrt(Pt)*H*xn(:,i)+n;
yn(:,i)=quantizer(rn,M);
sum1=sum1+xn(:,i)*yn(:,i)';
sum2=sum2+yn(:,i)*yn(:,i)';
end
A=sum1*inv(sum2);
A=A';
case 2 %MRC
for i=1:N
b=randi([0 1],2*K,1);
b=b*2-1;
xn(:,i)=modulate(b)';
rn=sqrt(Pt)*H*xn(:,i)+n;
yn(:,i)=quantizer(rn,M);
sum3=sum3+sqrt(Pt)*yn(:,i)*xn(:,i)';
sum4=sum4+Pt*xn(:,i)*xn(:,i)';
end
HE=sum3*inv(sum4);
for ii=1:K
A(:,ii)=HE(:,ii)/norm(HE(:,ii),2)^2;
end
case 3 %ZF
for i=1:N
b=randi([0 1],2*K,1);
b=b*2-1;
xn(:,i)=modulate(b)';
rn=sqrt(Pt)*H*xn(:,i)+n;
yn(:,i)=quantizer(rn,M);
sum3=sum3+sqrt(Pt)*yn(:,i)*xn(:,i)';
sum4=sum4+Pt*xn(:,i)*xn(:,i)';
end
HE=sum3*inv(sum4);
A=inv(HE'*HE)*HE';
A=A';
case 4 %MRC,full CSI
for ii=1:K
A(:,ii)=H(:,ii)/norm(H(:,ii),2)^2;
end
case 5 %ZF,full CSI
A=inv(H'*H)*H';
A=A';
end
xse=A'*y;
xhe=demodulate(xse)';
for i=1:K
if(sign(real(x(i)))==1&&sign(imag(x(i)))==1)
cntx(1)=cntx(1)+1;
if(xhe(i*2-1)==1&&xhe(i*2)==1)
cnt(1)=cnt(1)+1;
elseif(xhe(i*2-1)==1&&xhe(i*2)==-1)
cnt(2)=cnt(2)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==1)
cnt(3)=cnt(3)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==-1)
cnt(4)=cnt(4)+1;
end
elseif(sign(real(x(i)))==1&&sign(imag(x(i)))==-1)
cntx(2)=cntx(2)+1;
if(xhe(i*2-1)==1&&xhe(i*2)==1)
cnt(5)=cnt(5)+1;
elseif(xhe(i*2-1)==1&&xhe(i*2)==-1)
cnt(6)=cnt(6)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==1)
cnt(7)=cnt(7)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==-1)
cnt(8)=cnt(8)+1;
end
elseif(sign(real(x(i)))==-1&&sign(imag(x(i)))==1)
cntx(3)=cntx(3)+1;
if(xhe(i*2-1)==1&&xhe(i*2)==1)
cnt(9)=cnt(9)+1;
elseif(xhe(i*2-1)==1&&xhe(i*2)==-1)
cnt(10)=cnt(10)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==1)
cnt(11)=cnt(11)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==-1)
cnt(12)=cnt(12)+1;
end
elseif(sign(real(x(i)))==-1&&sign(imag(x(i)))==-1)
cntx(4)=cntx(4)+1;
if(xhe(i*2-1)==1&&xhe(i*2)==1)
cnt(13)=cnt(13)+1;
elseif(xhe(i*2-1)==1&&xhe(i*2)==-1)
cnt(14)=cnt(14)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==1)
cnt(15)=cnt(15)+1;
elseif(xhe(i*2-1)==-1&&xhe(i*2)==-1)
cnt(16)=cnt(16)+1;
end
end
end
%cntx
%cnt
for ii=1:16
tempP(ii)=tempP(ii)+cnt(ii)/cntx(fix(ii/4.1)+1); %p(xk|xk,H)
end
for iii=1:4
tempPx(iii)=tempPx(iii)+cntx(iii)/K; %p(xk)
end
end
for ii=1:16
p(ii)=tempP(ii)/iteration;
end
for iii=1:4
px(iii)=tempPx(iii)/iteration;
end
end