test.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。

%% Made by Zheng Xiao (052815 05b04)
%% Group Member: Ji Yue, Sun Xin, Zheng Xiao

%clear
% Generate Signal
%M = 16; %-the number of Sample per Period in input signal
N = 32; %-the number of Sample per Period in BPSK Modulated signal
M = 64; %-the number of Sample per Period in input signal
P1 = [0 5 7 8 9 13 15];
P2 = [0];
%tk = 0:1/M:(1024/M);
%input = sin(2*pi*tk) + cos(pi*tk);
%ratio = max(input);
%input = input/ratio;
% A-law PCM encode

% Lengthen PCM code
%%pcmCode = [1];
original=[1]; % User Code
nOriginal = length(original);
pcmCode=expand_bit(original);%must be 64xN length
key1 = genM(M,P1);
%autocorrelation(genBipolar(key1)); % 画图: generated m-sequence
m = genBipolar(genM(6000,P1));%!!!!!!!!!!!!!!!!!
subplot(2,1,1)
stem(xcorr(m,m))
subplot(2,1,2)
autocorr(m);