i writed a code for adaptive channel equalizer with LMS algorithm but i donot recieve a desire answer for learning curve . i want to find problem of program . input signal of channel is a 16-QAM .

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hadi zavi 2015-6-28

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回答： hadi zavi 2015-6-29

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iterate=200;

N=1000;

M=8;

mu=0.01;

ms=zeros(N,1);

p=[0.1483;0.2595;-0.0318;-0.1536;-0.2118;0.1059;0.5295;0.7314];

for k=1:iterate

j = sqrt(-1);

x = sign(randn(N,1)).*(2+sign(randn(N,1)))+ j*sign(randn(N,1)).*(2+sign(randn(N,1)));

    v=sqrt(0.001)*randn(N,1);
    d=filter(p,1,x)+v;
    u=d(1:N);
    w=zeros(M,1);
    e=zeros(N,1);
    y=zeros(N,1);
    uvect=zeros(M,1);
    for i=1:N
        uvect=[u(i);uvect(1:M-1)];
        y(i)=w'*uvect;
        e(i)=x(i)-y(i);
        w=(w+mu*uvect*conj(e(i)));
    end
    ms=ms+abs(e.*e);