扩频通信系统的抗干扰分析

扩频通信系统的抗干扰分析(论文13000字)
摘要：扩频通信是1975年左右开始才慢慢形成的一种新型的通信系统。它的抗干扰，抗衰落和抗多径的能力是传统通信系统无法企及的。在过去的十年中，随着信息技术的飞速发展和日益普及，扩频通信技术已被广泛应用于军民通信领域，各种新型产品也开始逐渐出世并且这些产品以一个非常快的速度渗透到人们的日常生活当中。
    本文阐述了当今社会扩频通信的重要性，详细描述了无线扩频通信系统的组成，系统工作原理，功能模块设计方法和仿真算法，在现有理论的基础上利用MATLAB函数和Toolbox Simulink进行通信相关方面分析，仿真模块对直接序列扩频通信系统进行仿真分析，并将基本概念和设计思想直观地联系起来。根据扩频通信的特点和原理，详细研究了扩频通信的具体分析，如扩频同步，载波同步和窄带干扰抑制技术。
关键词：扩频通信；Simulink仿真；抗干扰

Anti-jamming analysis of spread spectrum communication system
Abstract: Spread spectrum communication is a new type of communication system which began to form slowly around 1975.Its anti-interference, anti-fading and anti-multipath capabilities are beyond the reach of traditional communication systems. In the past decade, with the rapid development and increasing popularity of information technology, spread spectrum communication technology has been widely used in the field of civil-military communication, and various new products have begun to emerge gradually, and these products permeate into people's daily life at a very fast speed.
      This paper expounds the importance of spread spectrum communication in today's society, describes in detail the composition, working principle, functional module design method and simulation algorithm of wireless spread spectrum communication system, and based on the existing theories, analyzes the communication related aspects by MATLAB function and toolbox Simulink, and simulates and analyzes the direct sequence spread spectrum communication system by simulation module, and intuitively connects the basic concepts and design ideas. According to the characteristics and principles of spread spectrum communication, the specific analysis of spread spectrum communication is studied in detail, such as spread spectrum synchronization, carrier synchronization and narrowband interference suppression technology.
Keywords: Spread spectrum communication; Simulink simulation: anti-interference

目 录
1绪论    1
1.1 引言    1
1.2 扩频通信技术的基本概念    1
1.3 扩频通信技术的理论依据    2
1.4 扩频系统抗干扰能力的理论分析    3
2扩频通信系统的分类    3
2.1 直接序列扩频系统    4
2.2 跳频扩频通信系统    5
2.3 混合方式     6
3 MATLAB/Simulink对扩频通信系统抗干扰情况的仿真    6
3.1 LDPC信道编码模块    6
3.2 扩频调制模块    8
3.3 BPSK调制模块    10
3.4 信道模块    11
3.5 抗干扰模块    12
3.6 PN码同步模块     13
3.7 载波同步模块    15
3.8 LDPC解码模块     17
4扩频通信的抗干扰性能分析    19
5总结    19
参考文献    21
致谢    22