autocorrelation.m

Matlab 模拟 CDMA 直接扩频。m序列生成矩阵为p(x) = 1 + x^5 + x^7 + x^8 + x^9 + x^13 + x^15。能画出每阶段的时域、频域图。

function [ output ] = autocorrelation( input )
%Get and Plot auto-correlation of the input array.

%n = length(input);
r = circonvt(input,fliplr(input),length(input));
%k = (-n):n';
%stem(k,r);
stem(r)
xlabel('Lag index');ylabel('Amplitude');
%v = axis;
%axis([-n n v(3:end)]);

output = r;