clc
close all
clear all
N=input('length of input sequence N = ');
t=[0:N-1];
ita=10^4;
I=ones(1,N);
R=ita*I;
w0=0.001; phi=0.1;
d=sin(2*pi*[1:N]*w0+phi);
x=d+randn(1,N)*0.5;
w=zeros(1,N);
for i=1:N
y(i) = w(i)' * x(i);
e(i) = d(i) - y(i);
z(i) = R(i) * x(i);
q = x(i)' * z(i);
v = 1/(1+q);
zz(i) = v * z(i);
w(i+1) = w(i) + e(i)*zz(i);
R(i+1) = R(i) - zz(i)*z(i);
end
for i=1:N
yd(i) = sum(w(i)' * x(i));
end
figure;
subplot(221),plot(t,d),ylabel('Desired Signal'),
subplot(222),plot(t,x),ylabel('Input Signal+Noise'),
subplot(223),plot(t,e),ylabel('Error'),
subplot(224),plot(t,yd),ylabel('Adaptive Desired output');
figure;
semilogy(abs(e));
abs(e);
