基于MATLAB的CDMA系统仿真.doc

文档介绍：基于MATLAB的CDMA系统仿真
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作业要求
,逐行给出中文注释,并分析仿真结果。
,并进行仿真。
信源
卷积编码
交织编码
加扰码
扩频
调制
AWGN信道
调制
解扩
信宿
解卷积
解交织
去扰码
分析附录的源程序,逐行给出中文注释,并分析仿真结果。
%
%此函数用于IS-95前向链路系统的仿真,包括扩
%频调制,匹配滤波,RAKE接收等相关通信模块。
%仿真环境: 加性高斯白噪声信道.
%数据速率= 9600 KBps
%
clear all
close all
clc
disp('--------------start-------------------');
global Zi Zq Zs show R Gi Gq
clear j;
show = 0; %控制程序运行中的显示
SD = 0; % 选择软/硬判决接收
%-------------------主要的仿真参数设置------------------
BitRate = 9600; %比特率
ChipRate = 1228800; %码片速率
N = 184; %源数据数
MFType = 1; % 匹配滤波器类型--升余弦
R = 5;
%+++++++++++++++++++Viterbi生成多项式++++++++++++++++++
G_Vit = [1 1 1 1 0 1 0 1 1; 1 0 1 1 1 0 0 0 1];%Viterbi生成多项式矩阵
K = size(G_Vit, 2); %列数
L = size(G_Vit, 1); %行数
%++++++++++++++++++++++++++++++++++++++++++++++++++++++
%++++++++++++++++++++++Walsh矩阵++++++++++++++++++++++++
WLen = 64; %walsh码的长度
Walsh = reshape([1;0]*ones(1, WLen/2), WLen , 1); %32个1 0行
%Walsh = zeros(WLen ,1);
%++++++++++++++++++++++++++++++++++++++++++++++++++++++
%++++++++++++++++++扩频调制PN码的生成多项式++++++++++++++
%Gi = [ 1 0 1 0 0 0 1 1 1 0 1 0 0 0 0 1]';
%Gq = [ 1 0 0 1 1 1 0 0 0 1 1 1 1 0 0 1]';
Gi_ind = [15, 13, 9, 8, 7, 5, 0]'; %i路PN码生成多项式参数
Gq_ind = [15, 12, 11, 10, 6, 5, 4, 3, 0]'; %q路PN码生成多项式参数
Gi = zeros(16, 1); %16×1的0矩阵
Gi(16-Gi_ind) = ones(size(Gi_ind));%根据Gi_ind配置i路PN码生成多项式
Zi = [zeros(length(Gi)-1, 1); 1];
% I路信道PN码生成器的初始状态
Gq = zeros(16, 1); %16×1的0矩阵
Gq(16-Gq_ind) = ones(size(Gq_ind)); %根据Gq_ind配置q路PN码生成多项式
Zq = [zeros(length(Gq)-1, 1); 1];
% Q路信道PN码生成器的初始状态
%++++++++++++++++++++++++++++++++++++++++++++++++++++++
%+++++++++++++++++++扰码生成多项式++++++++++++++++++++++
Gs_ind = [42, 35, 33, 31, 27, 26, 25, 22, 21, 19, 18, 17, 16, 10, 7, 6, 5, 3, 2, 1, 0]';
Gs = zeros(43, 1); %43×1的0矩阵
Gs(43-Gs_ind) = ones(size(Gs_ind)); %根据Gs_ind配置扰码生成多项式
Zs = [zeros(length(Gs)-1, 1); 1];
% 长序列生成器的初始状态
%+++++++++++++++++++++++++++++++++++++++++++