[1050503053]

isi=[0.28,1,0.28];%ISI信道参数
order=63;%滤波器阶数;
snr=30;%AWGN信道信噪比;
len=1000;%训练序列长度;
mu=0.02;%调整步长;
M=(order-1)/2;
N=len+length(isi)-1
e=zeros(1,N);
error=e;
out=zeros(1,N);%FIR滤波器输出
mumber=0;
for i=1:100
n=sign(rang(1,len)-0.5);%采用PN码作为训练序列
noise =randn(1,N) /10.^(snr/10);%加入AWGN
y=conv(isi,x)+noise;
wk=zeros(1,order);　　
for n =order:N-M+1%LMS算法
y1=y(n+M-1:-1:n-m-1);　
e(n)=x(n-2)-d1;
wk=wk+mu3e(n)3y1;
e(n)=103log10(ads(e(n)));
end
erro=error+e
end
error=error(order:N-M+1)/100;