基于MATLAB对模拟调制信号的 仿真及识别

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基于MATLAB对模拟调制信号的 仿真及识别

学院、系 鄂尔多斯学院电子信息科学与技术

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基于MATLAB对模拟调制信号的仿真及识别

摘 要

现代通信技术的飞速发展，使得在通信过程中能否对信号进行准确的识别也越来越重要，传统的单一的特定通信在现代化的多频段、多功能的通信中已经不能胜任，在这样的背景下，就需要研究更好的识别方法来识别信号。首先运用MATLAB软件对AM，FM，DSB,SSB四种信号进行了仿真，然后分别对几种信号进行了调制并分析各信号的瞬时特征，继而设计出识别方法，最后利用这些瞬时特征参数和识别方法对模拟信号进行识别并得出识别方法的可行性。

关键词 MATLAB，模拟调制信号，识别

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The Simulation and Recognition of Analog modulation signals based on

MATLAB

Abstract

With the development of modern communication technology, the signal recognition

requirements are also increasing in the communication process and traditional single communication in the modern multi-band, multi-functional communication has been outdate, so we need to study more identification method to identify the signal. This paper make a simple introduction for analog signal recognition method. In such under the background, it needs to research better identification methods to identify the signal. First, using four signals that is AM, FM, DSB, SSB to simulated, then analyzing the transient characteristics of each modulated signal, and then designing a method.Finally it can describes a method to identify signal by instantaneous characteristics and verify its feasibility.

key Word MATLAB，Analog modulation signal，identify

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目 录

摘 要 .................................................................................................................................................... Ⅰ Abstract ....................................................................................................................................................... Ⅱ 1 MATLAB的概述 ................................................................................................................................... 1 2各模拟信号的调制................................................................................................................................. 2

2.1调幅调制 ....................................................................................................................................... 2

2.1.1对AM信号的调制 ......................................................................................................... 2 2.1.2抑制载波双边带调制 ..................................................................................................... 3 2.1.3单边带调制 ....................................................................................................................... 3 2.2调频信号和调相信号的调制 ................................................................................................... 4

2.2.1 FM调制 ............................................................................................................................. 4 2.2.2 PM调制 ............................................................................................................................. 5

3算法的简介 .............................................................................................................................................. 6

3.1希尔伯特（Hilbert）变换及其算法 ...................................................................................... 6 3.2解析信号对信号的分析 ............................................................................................................ 6

3.2.1解析信号 ............................................................................................................................ 6 3.2.2瞬时包络和瞬时相位的求解 ........................................................................................ 7 3.2.3解析信号估计瞬时频率 ................................................................................................. 7

4模拟调制信号的识别 ............................................................................................................................ 8

4.1基于决策理论的模拟调制识别 .............................................................................................. 8

4.1.1识别参数?max .................................................................................................................... 9 4.1.2识别参数?ap ..................................................................................................................... 9 4.1.3识别参数P ..................................................................................................................... 10 4.2调制识别的流程 ........................................................................................................................ 10 4.3实验结果分析 .............................................................................................................................11 5结论 .......................................................................................................................................................... 12 致 谢 ......................................................................................................................................................... 13 参 考 文 献 ............................................................................................................................................. 14

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