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1、直接序列扩频通信抗干扰方案设计【摘要】 直接序列扩频通信系统由于其独特的抗干扰能力以及隐蔽性，在军事通信上获得了广泛的应用。直扩通信系统本身的抗干扰的能力与扩频增益成正比，但随着通信技术的发展可利用的频谱空间已经越来越有限，在复杂且不可预知的强电磁干扰下，靠提高扩频增益对干扰进行抑制的方法就显得有些不足了，并且在军事通信中还会受到敌方有意的强窄带干扰。这些人为干扰往往会超出接收机的干扰容限，将导致系统不能正常工作。因此，有必要采用信号处理技术对强窄带干扰进行抑制，以有效提高系统的性能。经研究表明，现已有的窄带抑制技术基本可分为两类:时域处理技术和变换域处理。基于时域的抑制技术能更彻底地抑制干扰
2、,但收敛速度较慢,往往只能处理平稳时变信号；基于变换域的干扰抑制技术避免算法的收敛问题,可实时消除干扰,当干扰变化很块时,其优势明显。 关键词：直接序列扩频系统,抗干扰技术,仿真, direct sequence spread spectrum system(DSSS),Anti-jamming technology,SimulationABSTRACTDS communication system because of its unique anti-jamming capabilities, and concealed in the military communications on a
3、ccess to a wide range of applications. Direct sequence spread spectrum communication system itself has strong anti-interference capabilities; the ability of its interference with the spreading gain is directly proportional. Now, with the development of communication technologies available spectrum s
4、pace is increasingly limited! In the complex and unpredictable strong electromagnetic interference, spreading gain by raising the interference suppression methods it is stretched, And in military communications in the enemys will be interested in the narrowband-interference, these man-made interfere
5、nce often exceed the receiver interference tolerance, the system will not work properly. Therefore, it is necessary to use signal processing technology to inhibit strong narrow-band interference, to effectively improve system performance. After years of study, has some basic narrowband suppression c
6、an be divided into two categories: time-domain processing technology and transform domain processing. Based on the time-domain suppression technology can more thoroughly suppress interference, but convergence is slow, often can only handle a smooth time-varying signal; domain based on the transforma
7、tion of technology to avoid interference suppression algorithm for the problem of convergence, real-time to eliminate interference and interference when the changes are Block, its obvious advantages.Key Words：direct sequence spread spectrum system(DSSS)；Anti-jamming technology；Simulation【ABSTRACT】目录
8、 1.引言2.扩频通信2.1 直序扩频系统的应用背景2.2直扩系统的发展 2.3扩频通信介绍2.4直序扩频系统的特点2.5直接序列扩频通信技术与其他扩频方式的比较2.6直接序列扩频系统的组成3.扩频码序列 3.1 码序列的相关性3.2 M序列 3.3 GoId码序列4.基于时域的处理技术4.1时域预测技术基本原理4.2抑制性能4.3时域自适应线性预测滤波4.4时域自适应非线性预测滤波5。基于变换域的处理技术5.1频域陷波技术5.2小波包变换滤波技术5.2.1小波包变换滤波技术技术简介5.2.2小波包变换域自适应窄带干扰抑制接收机模型6.直接序列扩频通信技术6.1直接序列扩频的概念及理论基础 6.1.1 直接序列扩频的概念 6.1.2 扩频通信的理论基础 6.1.3扩频增益和抗干扰容限6.2 直接序列扩频的基本原理 6.3 直扩系统的性能6.3.1 直扩系统的抗干扰性6.3.2 直扩信号的抗截获性6.3.3 直扩码分多址通信系统6.3.4 直扩系统的抗多径干扰性能6.3.5 直扩测距定时系统6.4扩频序列通信系统的同步原理 7.直接序列扩频通信系统的MATLAB仿真7.1 MATLAB的基本操作7.2 Simulink仿真技术7.2.1 Simulink窗口环境 7.2.2功能模块的连接及设置 7.2.3 Simulink对通信系统的仿真 7.3 MATLAB源程序设计 感谢
