文档介绍：沈阳理工大学学士学位论文 I 摘要自从扩频通信的概念在 50 年代开始成熟以后,此后的二十多年扩频通信技术仍得到很大的发展,但都只是局部的发展,如硬件的改进和应用领域的拓展。一直到 80年代初期,扩频通信的概念都只是在军事通信系统中得到应用,这种状况到了 80 年代中期才得到改变。扩频技术发展到现在, CDMA 技术成为目前扩频技术中研究最多的对象, 其中民用通信的直接序列扩频技术广为应用。本文阐述了扩展频谱通信技术的基本原理、主要性能指标及其工作特点,然后根据香农定理和柯捷尔尼科夫潜在抗干扰理论, 通过 MATLAB 提供的 Simulink 仿真平台对直扩通信系统进行了仿真,建立了扩频通信系统仿真模型,详细讲述了各个模块的设计,并指出了仿真建模中要注意的问题。在给定的仿真条件下,运行了仿真程序,得到了预期的仿真结果。关键词: 扩频通信;信噪比; MATLAB 沈阳理工大学学士学位论文 II Abstract Since the concept of spread munication became mature in the 50 s, After twenty years of spread munication technology still get great development . But only developed locally, such as hardware improvement and development in the field of application . Until the early 80s, The concept of spread munication was only applied in the munication system . The situation was changed until in the mid of , CDMA technology is the most studied objects in the spread spectrum technology , One of munication widely used direct sequence spread spectrum technology . This article elaborated the spread munication technology's basic principle, the main performance index and the operating feature, then it act according to the Shannon theorem and tan oak Jieer the Nikefu latent antijamming theory, provides visualization tool Simulink and Monte using MATLAB the Carb simulation algorithm , has established the wide munications system simulation model, narrated in detail each module's design, and had pointed out in the simulation modelling must pay attention question. In assigns under the simulation condition, it moved the simulated program, obtained the anticipated simulation result. Key words :S pread S pectrum C ommunication ; Signal-to-Noise ; MATLAB 沈阳理工大学学士学位论文 III 目录 1绪论....................................................................................................................................... 1 课题背景........................................................................................................................ 1 扩频通信的研究意义及现状.............................