CDMA系统上行链路接入链路设计与仿真.doc

CDMA系统上行链路接入链路设计与仿真 作者姓名：马运超 专业名称：通信工程 指导教师：陈建国老师摘要 随着现代通信的发展，在任一时间、任一地点能与任一对象进行各种信息交流已成为现代通信理所当然的目标，促使移动通信技术发展异常迅速并日渐成熟。CDMA(Code Division Multiple Access)技术是当今通信领域主流的通信技术，最典型的是IS-95 CDMA蜂窝移动通信系统。同时CDMA码分多址技术作为第二代蜂窝移动通信系统主要的数字通信技术之一，已成为第三代移动通信的关键技术。 本文首先介绍了通信系统仿真的开发背景及其优缺点；然后给出了CDMA系统的关键技术、通信原理、信道结构及其上行链路相关知识；最后在给出CDMA上行链路系统模型的基础上，基于MATLAB/Simulink工具箱对各功能模块进行建模与仿真研究，利用广泛应用的仿真工具MATLAB，对CDMA系统上行链路业务信道的工作过程进行仿真设计，并通过仿真结果分析了系统的误码率和信噪比之间的关系。 关键词：CDMA，上行链路业务信道，仿真，IS-95标准，MATLAB Abstract With the development of modern communications, people exchange of information at any time, any place and any objects become the goal of modern communication undoubtedly, push the mobile communication technology developed quickly and more mature. CDMA (Code Division Multiple Access) technology is the mainstream communications technology nowadays in this field. The most typical is the IS-95 CDMA cellular mobile communication systems. At the same time, as the major technology of second generation of CDMA cellular mobile communication system has become the key third-generation mobile communications. This paper will describes the development background of communication system simulation technology, and discuss its advantages and disadvantages firstly. Second, list the knowledge of key technologies of CDMA system uplink, communication theory, and channel structure. Finally, based CDMA uplink system model and the MATLAB / Simulink toolbox to model and research the various functional modules. Using the common simulation tool -MATLAB, simulate the work process of CDMA system uplink traffic channel, and use the results of Simulation to analyze the relationship between SNR(Signal to Noise Ratio) with BER(Bit Error Rate). Key words : CDMA，Uplink Traffic Channel，simulation，Standard IS-95，MATLAB 目录 摘要 I Abstract I 目录 II 前言 1 1 CDMA系统原理及其仿真相关技术简介 3 1.1 CDMA系统概述 3 1.2 CDMA的关键技术 3 1.2.1 功率控制技术 3 1.2.2 软切换技