generatecode.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 [ out, o ] = generateCode( in, map )
% This function is used to generate Code according to given m-Serial built
%  in, which is "p(x) = 1 + x^5 + x^7 + x^8 + x^9 + x^13 + x^15".
%  Inputs:
%        inA: input Array of value of shift Register, must be 16-bit
%        map: 多项式指数 index
%        i: input signal
%  Usage: array = generateCode(array, [0 5 7 8 9 13 15], input)

o = in(16); %输出文件
temp = 0;
for j = map + 1
    temp = xor(in(j), temp);
end
in = circshift(in, [0 1]);
in(1) = temp;
out = in;