genm.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 ] = genM(n, key)
a = zeros(1,16); % shift register
a(1) = 1;
[a, temp] = generateCode(a,key);
output = temp;
for i = 2:n
    [a, temp] = generateCode(a,key);
    output = [output temp];
end