1、1 调制解调的调制解调的 MATLAB 实现实现 摘要：数字调制是通信系统中的重要环节之一，数字调制技术的改进对于通信 系统性能的提高具有重要的作用。 现代通信系统要求传输的质量好， 通信的距离远、 通信的容量大， 调制技术是其中的关键技术， 因此人们正努力的研究调制解调技术， 使得调制解调技术更好的服务于现代通信系统。本文首先分析几种数字解调系统的 几种基本调制解调方法，然后用 MATLAB 实现调制与解调的基本功能，并且进行 仿真的验证。 本文通过介绍 2ASK，2FSK，2PSK 的基本原理和调制解调的实现，对其进行 分析，然后设计运用 Simulink 这个仿真软件对二进制调制解调系统
2、进行模型的构 建、系统的设计、仿真的演示、结果的显示、误差的分析和综合性能的分析，本文 重点对 2ASK，2FSK，2PSK 进行性能比较和误差分析。通过分析可以在实际运用 中，根据情况而选择最佳的调制方式。 本文以 MATLAB 为软件平台，充分利用其提供的通信工具箱和信号处理工具 箱中的模块，对数字调制解调系统进行设计仿真，并且进行误差分析。 关键词关键词：MATLAB；调制解调；ASK；FSK；PSK；分析与仿真。 2 MODULATION AND DEMODULATION MATLAB IMPLEMENTATION Abstract: : The digital modulation
3、is one important aspect of the communication system, the improvement of digital modulation techniques for improved performance of the communication system has an important role. The quality of modern communication systems require transmission distance communication, communication capacity modulation
4、 technique is one of the key technologies, people are efforts modulation and demodulation techniques, better modulation and demodulation techniques in modern communication systems. This paper analyzes several digital demodulation system several basic modulation and demodulation method, and then use
5、the basic functions of modulation and demodulation MATLAB simulation verification. By 2ASK, 2FSK 2PSK the basic principles and modem implementation, analyze it, and then design use Simulink simulation software binary modulation and demodulation system model construction, system design, simulation, p
6、resentation, resultsthe display, error analysis and performance analysis, this paper focuses on 2ASK 2FSK, 2PSK performance comparison and error analysis. Analysis in the practical application, according to the situation and choose the best modulation. In this paper, MATLAB software platform, to take full advantage of its communications toolbox and signal processing toolbox module, digital modulation and demodulation system design and simulation, and error analysis. Key words: : MATLAB; Modulat
