In this thesis , first , we present the theory of sess system , the generation of the sess spreading code and its characteristics and the acquisition theory of conventional spread spectrum communication system . an efficient acquisition scheme based on periodically transmitting the synchronization head , which is composed of binary chaotic codes , using the matched filter and automatic decision threshold - level control based on a so - called constant false alarm criterion for sess system is present . the acquisition model of sess system is built and simulated in the awgn channel , the raleigh fading channel and imulti - address interfere condition 本文首先概述了自编码扩频通信的原理、自编码扩频序列的产生方法及其特性和扩频通信系统编码同步的理论,然后针对自编码扩频通信系统提出了扩频序列捕获方案:周期性地加入混沌序列同步码,并采用恒虚警率匹配滤波器捕获法;在加性白高斯噪声信道、瑞利衰落信道和多址干扰情况下进行了仿真,分析了各种捕获性能:在选择性能最优的混沌序列、适当的序列长度、虚警概率及门限值的情况下,可以获得较短的捕获时间和较大的捕获概率。
