1、 I 基于 Matlab 的数字通信系统调制解调研究 摘 要 当今， 随着通信技术日新月异的发展，尤其是数字通信的快速普及， 使得通信技术日新月异。现代通信系统要求通信距离远、通信容量大、 传输质量好，因此通信系统也日趋复杂。在各种通信系统的设计研发环 节中，软件仿真已成为必不可少的部分。应用 MatlabSimulink 的计算 机仿真具有经济、安全、可靠、编程简易以及实验周期短等特点。 因此， 本文就以 Matlab 为软件平台，利用其通信工具箱和信号处理 工具箱中的模块，尤其是 Matlab 语言的 Simulink 动态系统仿真软件包， 对数字调制解调系统进行仿真，并且对仿真结果进行误
2、差分析，从而对 现代数字通信有更加明确的认识和直观的了解。重点对 2ASK、2PSK、 2FSK 进行性能比较，在实际通信系统中，根据具体情况选择最合适的 调制方式，进一步促进数字通信的发展。 本文首先介绍了课题研究的背景和进行数字通信仿真的意义， 然 后介绍对数字通信系统进行仿真所使用的 MatlabSimulink 软件以 及这些软件在使用时的注意事项和采用的一些方法，随后又介绍了 数字调制系统的原理并据此进行数字调制解调系统的仿真，最后对 仿真结果进行误差分析，对设计进行总结归纳。 关键词：数字通信系统；调制解调；Matlab；Simulink；仿真 II Research of Mod
3、ulation and Demodulation in Digital Communication System Based on the Matlab Abstract Nowadays, with the rapid development of communication technology, especially the rapid spread of the digital communication, makes communication technology is developing rapidly. Modern communication system requirem
4、ents communication distance, communication capacity, transmission quality is good, because this communication system has become more and more complex. In all kinds of communication system design r&d link, the software has become an indispensable part of. Application of computer simulation, Simulink
5、Matlab has economic, safe, reliable, easy programming and the cycle is short, etc. Therefore, this paper is using Matlab software platform, Use its communication tool box and signal processing toolbox module, especially Matlab language dynamic system simulation software package of simulink on digita
6、l demodulation system, and simulation results of simulation and error analysis, and the modern digital communication have more explicit recognition and intuitive understanding. Emphasis on 2 ASK, 2 PSK, 2 FSK performance comparison, in actual communication system, according to the specific circumstances to select the most appropriate modulation mode, and further promote the development of digital communication. This paper firstly introduces the background of the subject research and the mean
