addnoise.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 ] = addNoise( in, ratio )
%UNTITLED1 Summary of this function goes here
%  Detailed explanation goes here
n = length(in);
out = (rand(1,n)-0.5).*ratio + in;