## 基于matlab的数字调制在不同信道中的性能仿真

Matlab是一款功能强大的应用工具软件，Matlab提供了可视化的系统仿真环境，可以方便、灵活的建立各种形象的仿真模型，让抽象的理论通过图形形象的呈现在我们眼前。本文即利用Matlab建立通信仿真模型对理论知识加深学习。经过最近对通信原理的学习，本文中对通信系统中的二进制数字调制系统进行编程和仿真，并对结果进行比较和分析。

Matlab-based Digital Modulation Performance Simulation in Different Channels
Abstract:  Using Matlab as a programming tool for binary digital modulation system is analyzed, designed a binary digital modulation system model, simulation model and the simulation process and the results of a detailed analysis, to strengthen the theoretical knowledge to learn and master. With the continuous development of communication systems, communication technology more and more attention, which is also a binary digital modulation system has been fully developed as a communication professional students should proficient knowledge of communication, but only by a written knowledge inevitably too too abstract. Matlab is a powerful software application tools, Matlab provides a visual system simulation environment that can facilitate flexible simulation model to establish a variety of images, so that the abstract theory presented by graphic images in front of us. In this paper, namely the use of Matlab established communication simulation model to enhance the learning of theoretical knowledge. After the recent study on communication theory, this article on binary digital communication system modulation system for programming and simulation, and the results were compared and analyzed. A digital signal has two means of transmission, which are the base band transmission method and modulation transmission, i.e., band-pass, in practical applications, because the baseband signal contains a large low-frequency component is not conducive to transmit, it must go through the carrier and modulated bandpass signal is formed by The digital baseband signal to the carrier for controlling certain parameters, so as to vary with changes in the baseband signal, which is a digital modulation process. Efficient long-distance transmission of digital modulation signals provide protection, is now widely used in life and production. Also, according to the different parameters of the control mode of the carrier, there are digital modulation amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK) in three basic forms. The design for the binary 2ASK, 2FSK, 2PSK discuss the application matrix laboratory Matlab simulation, analysis and modification, to generate an interactive interface through simulation system to facilitate the operation of the simulation system. Through the system simulation, a more intuitive understanding of the performance of a digital modulation system and the factors that affect its performance in order to facilitate comparison, reviews and improvements.    Based on the knowledge learned in college, on the basis of digital modulation signals for a detailed description, and the M-file programming method to make a simulation waveform modulation process, and then they use the platform to build a Simulink simulation of the power spectral density model and get the desired simulation results. By summing BFSK basic principle, the use of MATLAB Simulink simulation systems and operational procedures to complete the simulation BFSK transmission performance of three transmission channels. Three kinds of channel is Gaussian white noise channel, multi-path Rayleigh channel and multi-path channel Roentgen. Also using MATLAB simulation PSK DPSK transmission channel capacity. Comparison of three methods of waveform, got the desired results. In the meantime, the compiler parameter settings and MATLAB are two key points is difficult. Finally, based on the analysis of simulation compares the performance of all aspects of the modulation effects and feasibility of the simulation model. 基于matlab的数字调制在不同信道中的性能仿真:http://www.lwfree.cn/zidonghua/20180405/12430.html
------分隔线----------------------------