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文档编号:TX345 文档字数:13212,页数:44 摘要 调制和解调是通信系统中最为关键的功能模块。使载波的某一参数(振幅、相位或频率)与原调制信号的变化规律相一致的过程即为调制。无论是模拟调制还是数字调制，其基本的调制方式主要有调幅、调频以及调相三种。在这三种基本的调制方式下，通过变化，可实现各式各样的调制方式。调制信号是由原始信息(如声音、文字、图像等)转变成的高频或视频信号。解调是调制的逆过程，它的作用是从已调波信号中取出原来的调制信号。本文着重研究模拟调制中普通调幅AM,双边带调幅DSB,单边带调幅SSB和调频FM的调制与解调原理，并用MATLAB编程进行仿真，最后用图形用户界面GUI显示出波形，直观的了解调制与解调的过程。 关键词：普通调幅AM,双边带调幅DSB,单边带调幅SSB，调频FM ABSTRACT Modulation and demodulation are the most critical functional blocks in a communication system. The definition of modulation is to make a certain parameters (amplitude, phase or frequency) of the carrier changed same with the original modulating signal. Either analog modulation or digital modulation, the basic modulation methods are mainly three types as amplitude modulation (AM), frequency modulation (FM) and phase modulation (PM). On the basis of these three modulation methods, a wide variety of modulations can be realized. Modulated signal is a low-frequency signal or video signal comes from the original information (such as voice, text, images, etc.). Demodulation is the reverse process of modulation; its role is extracting the original signal from a modulated wave signal. For amplitude modulation, demodulation is a extraction process which extract the original signal from the change amplitude of the modulated signal.This paper studies analog modulation which contain AM, FM, SSB DSB's modulation and demodulation. We use MATLAB to simulation then using Matlab graphical user interface (GUI) shows waveform to make us understand the process of the modulation and demodulation intuitively. Keywords: Amplitude Modulation(AM),Double-sideband Amplitude Modulation (DSB),Single-sideband Amplitude Modulation(SSB),Frequency Modulation (FM) 目录 摘要 I
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| Tags：基于 GUI 模拟 调制 解调 仿真 | 2011-04-01 09:59:14【返回顶部】 |
