function y=circonv(x1,x2,N);
if length(x1)>N
error('N should higher than or equal to the length of x1!');
if length(x2)>N
end
x1=[x1,zeros(1,N-length(x1))];
x2=[x2,zeros(1,N-length(x2))];
m=0:1:N-1;
H=zeros(N,N);
for n=1:1:N
H(n,:)=cirshift(x2,n-1,N);
end
y=x1*H';
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