untitled.m

channel estimation using Ls and MMSE algorithms also calculates the Mean square error and SER

clear all
close all
hold off%??????
sysorder = 5 ;%???
N=100;%?????
inp = randint(N,1);%????????
inp=2*inp-1;
n = randn(N,1);
[b,a] = butter(2,0.25);
Gz = tf(b,a,-1);%?????
h= [0.0976;0.2873;0.3360;0.2210;0.0964;];%??????
y = lsim(Gz,inp);%????
n = n * std(y)/(10*std(n));%????
d = y + n;%??????
totallength=size(d,1);%??
N=60 ; %60????????
%?????
w = zeros ( sysorder , 1 ) ;%???
for n = sysorder : N 
u = d(n:-1:n-sysorder+1) ;% u???
xx(n)= w' * u;%????
e(n) = inp(n) - xx(n) ;%??
if n < 20
mu=0.32;
else
mu=0.15;
end
w = w + mu * u * e(n) ;%????
end 

hold on
plot(d)
plot(y,'r');
title('????') ;
xlabel('??')
ylabel('????')
figure
semilogy((abs(e))) ;% e??????
title('????') ;
xlabel('??')
ylabel('????')
figure%??
plot(h, 'k+')
hold on
plot(w, 'r*')
legend('?????','?????')
title('??????????') ;
axis([0 6 0.05 0.35])