自适应噪声对消器.doc

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1、自适应噪声对消器clearallclc              t=0:1/1000:10-1/1000;s=sin(2*pi*t);snr=10;s_power=var(s);              %var函数:返回方差值linear_snr=10^(snr/10);factor=sqrt(s_power/linear_snr);noise=randn(1,length(s))*factor;x=s+noise;                   %由SNR计算随机噪声x1=noise;                    %噪声

2、源输入x2=noise;w1=0;                       %权系数初值w2=0;e=zeros(1,length(x));y=0;u=0.05;                 fori=1:10000                 %LMS算法    y=w1*x1(i)+w2*x2(i);    e(i)=x(i)-y;    w1=w1+u*e(i)*x1(i);    w2=w2+u*e(i)*x2(i);   endfigure(1)subplot(3,1,1)plot(t,x);title('带噪声正弦信号'

3、)axis([010-1.21.2]);subplot(3,1,2)plot(t,noise);title('噪声信号')axis([010-1.21.2]);subplot(3,1,3)plot(t,e);title('自适应噪声对消器')axis([010-1.21.2]);