un.m

In this project we analyze and design the minimum mean-square error (MMSE) multiuser receiver for un

N=64;
K=32;
z=[6 7 8 9 10 11 12 13 14 15 16 17];
snr=power(10,z/10);
R=[1 2 3 4 5 6 7 8];
L=power(2,R);
a=eye(K);
var=power(10,-z/10);
alpha_a=power((K/N+var),-0.5);

delta=[1.5956,0.9957,.5860,0.3352,0.1881,0.1041,0.0569,0.0308];


for i=1:N
    for j=1:K
        r=randint;
        s(i,j)=(2*r-1)/sqrt(N);
    end
end



for i=1:12 

    c=s(1:N,5); 
    R=((alpha_a(i))^2)*(s*a*a*s'+var(i)*eye(N,N));
    p=alpha_a(i)*c;
    u(i)=p'*inv(R)*p;
    gamma(i)=u(i)/(1-u(i));
    ber(i)=qfunc(sqrt(gamma(i)));
    
end



     ber1= log10(ber(1:12));
       plot(z,ber1,'r')