扩频通信系统性能分析与仿真VIP免费

本科生毕业论文(设计)CDMA通信系统中的接入信道部分进行仿真与分析院系电信学院专业电子信息工程班级05电信一班学号0612050527学生姓名孙登高联系方式13782330153指导教师殷志峰职称：副教授2009年5月目录摘要.........................................................................................1Abstract......................................................................................9第一章直接扩频通信概述..........................11.1基本原理.......................................................................11.2扩频通信的主要特点...............................21.3直接序列扩频通信系统.......................3第二章扩频码（m序列）................................52.1引言..................................................................................52.2最长线性反馈移位寄存器序列——m序列.................................................................................................52.2.1m序列的性质........................................................52.2.2m序列扩频码的自相关函数......62.2.3m序列扩频码的功率谱密度......72.2.4m序列的的互相关函数......................82.2.5m序列信号的产生.......................................82.2.6m序列优选对........................................................10第三章硬件系统设计与实现.................113.1设计思想与系统参数...........................113.2发射电路................................................................123.2.1时钟信号产生...................................................123.2.2信息码的产生...................................................133.2.3m序列的产生........................................................15目录3.2.4扩频信号的产生...........................................163.2.5信号调制....................................................................173.2.5.1二相相移键控(BPSK)..........................173.2.5.2平衡调制器...............................................183.3接收电路................................................................223.3.1接收滤波....................................................................223.3.1.1BPSK信号的功率谱..........................223.3.1.2接收滤波器设计...............................233.3.2扩频信号的相关解调..........................253.3.3扩频信号的相关解扩..........................263.3.4抽样判决电路...................................................29第四章直接扩频通信系统的性能分析324.1抗干扰能力........................................................324.2信噪比和误码率..........................................354.3多址能力................................................................39第五章SystemView软件仿真.......................435.1SystemView动态软件简介.......................435.2直接扩频通信系统仿真（无噪声情况）.............................................................................................435.2.1系统模型及主要模块参数..........435.2.2主要输出点波形...........................................455.3直接扩频通信系统抗干扰性分析475.3.1加入高斯白噪声后系统性能。475.3.1.1加入高斯白噪声后系统模型475.3.1.2系统误码率的理论值与测量值的比较.....................................................................................47目录5.3.2扩频序列对窄带噪声及宽带噪声的影响比较............................................................................515.4直接扩频通信系统多址能力分析535.4.1系统模型及主要模块参数..........535.4.2系统多址干扰分析.......