摘要随着计算机通信技术的迅猛发展，数字电话通信技术的重要性日益突出，成为现代工业发展的一个必备的基本技术。而在对原有的通信系统做出改进或建立一个新系统之前，通常需要对这个系统进行建模和仿真。61665

本论文所研究的是基于Matlab数字电话通信系统的仿真分析。本文首先论述了数字电话通信系统的概念和基本理论，重点介绍了采样定理、均匀和非均匀量化定理、PCM和DPCM编译码算法及M-PSK调制方法等。然后以Matlab下的Simulink为系统建模工具，分别构建了PCM、DPCM数字电话通信系统，并根据波形反复修改参数，优化系统性能。最后经过对仿真结果的分析得出各种相应的结论。

毕业论文关键词        数字电话通信系统仿真    PCM    DPCM      SIMULINK

毕业设计说明书（论文）外文摘要

Title       digital telephone communication system simulation analysis based on Matlab                                                                     

Abstract With the rapid development of computer communication technology, digital telephone communication technology has been playing an important part,and becoming a prerequisite basic technology of modern industry . To make improvements or create a new system with the original communication system , the system usually needs modeling and simulation .

    What we study in this paper is digital telephone communication system simulation analysis based on Matlab . This paper first discusses the concept of digital telephone communication system and the basic theory, focusing on the sampling theorem, uniform and non-uniform quantization theorems, PCM and DPCM encoding and decoding algorithms and M-PSK modulation methods. Then PCM, DPCM digital telephone communication system were constructed with simulink modeling tools, and it is modified repeatedly according to the waveform parameters to optimize system performance. Finally various corresponding conclusions were obtained according to the analysis of simulation results .

Keywords       digital telephone communication system simulation PCM   DPCM    SIMULINK

1  引言 1

1.1  课题研究背景 1

1.1.1  数字电话通信系统的由来和发展 1

1.1.2   通信系统仿真简介 1

1.2  本文研究的内容和目的 2

1.2.1  研究的内容 2

1.2.2  研究的目的 2

2  数字电话通信系统的基本理论 2

2.1  抽样定理 2

2.1.1  Nyquist采样定理 2

2.1.2  带通信号采样 3

2.2  量化定理 7

2.2.1  均匀量化 7

2.2.2  非均匀量化 9

2.3  编译码理论 11

2.3.1  脉冲编码调制（PCM） 11

2.3.2  差分脉冲编码调制（DPCM） 12

2.4  调制解调定理 13

2.4.1  调制的介绍和分类