基于SIMULINK直接扩频序列通信系统的设计

石家庄铁道大学四方学院毕业设计

基于Simulink直接序列扩频通信系统

设计

Direct Sequence Spread Spectrum Communication Systems Design Based on

Simulink

摘要

直接序列扩频通信系统(DSSS)因其抗干扰性强、隐蔽性好、易于实现码分多址(CDMA)、抗多径干扰、直扩通信速率高等众多优点，而被广泛应用于许多领域中。

本文设计了一种基于Simulink的直接序列扩频通信系统。首先对直接序列扩频通信系统从应用背景、特点、意义和发展几个方面进行了研究，然后从直接序列扩频通信系统的基本理论、基本原理、性能和扩频通信系统的同步原理等方面阐述了直接序列扩频通信系统，并对直接扩频通信系统进行了仿真研究和理论分析，达到了预期的效果。本文从理论上分析了直接序列扩频通信系统的抗干扰性能。

本系统包括信号生成部分、发送部分、接收部分、调制和解调、加扩与解扩五个部分。并以BPSK系统为例，给出了误码率理论分析结果，达到了预期的效果。本文研究的直接序列扩频通信系统，为以后的频谱通信系统打下了基础。

关键词：直接序列扩频通信系统MATLAB仿真Simulink模块仿真

Abstract

Direct sequence spread spectrum communication system (DSSS) because of its strong anti-interference, easy to conceal and easy to realize code division multiple access (CDMA), fight multipath interference, straight expansion communication rate higher numerous advantages, is widely used in many fields.

This paper introduces a design of Simulink based on the direct sequence spread spectrum communication system. First to direct sequence spread spectrum communication system from application background, features, significance and the development of a research, and then from the direct sequence spread spectrum communication system, the basic theory of basic principle, performance and spread spectrum communication system of synchronous principle, this paper describes direct sequence spread spectrum communication system, and the directly spread spectrum communication system simulation and theory analysis, achieve the expected effect. The paper theoretically analyzes the direct sequence spread spectrum communication system of anti-jamming performance.

This system includes signal generation part, sending part, receiving part, modulation and demodulation, add expansion and solution expansion of five parts. And with BPSK system as an example, the theoretical analysis results are ber, achieve the expected effect. This paper studies the direct sequence spread spectrum communication system, for the following spectrum communication system laid a foundation.

Keywords: Direct sequence spread spectrum communication system Simulink MATLAB Simulation

目录

第1章绪论 (1)

1.1直接扩频通信系统的应用背景 (1)

1.2直接扩频通信系统的意义 (1)

1.3直接扩频通信系统的特点 (1)

1.4直接扩频通信系统的发展 (3)

第2章直接扩频通信系统技术 (4)

2.1直接序列扩频基本理论 (4)

2.1.1扩频通信的理论基础 (4)

2.1.2扩频增益和抗干扰容限 (5)

2.2直接序列扩频的基本原理 (6)

2.3 直接序列扩频的基本原理 (9)

2.3.1直扩系统的抗干扰性 (9)

2.3.2直扩系统的抗截获性 (10)

2.3.3直扩码分多址通信系统 (11)

2.3.4直扩系统的抗多径干扰性能 (11)

2.3.5直扩测距定时系统 (12)

2.3.6扩频序列通信系统的同步原理 (12)

第3章基于Simulink的直接序列扩频通信系统的仿真 (14)

3.1直接序列扩频通信系统功能模块的连接及设置 (14)

3.1.1功能模块的连接 (14)

3.1.2直接序列扩频通信系统功能模块的连接及设置 (17)

3.2直接序列扩频通信系统功能的实现 (23)

3.3总结 (28)

第4章直接扩频通信系统性能分析 (29)

4.1直接序列扩频系统误码率的仿真 (29)

4.2仿真结果分析 (31)

4.3结论 (32)

第5章应用 (33)

参考文献 (34)

致谢 (35)

附录 (36)

附录A外文资料 (36)

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