基于MATLABSimulink的模拟通信系统的仿真(线性调制).docVIP

摘 要 1 前言 1 课设的意义和目的 1 通信系统及其仿真技术 1 课设的主要内容 3 1. SIMULINK与通信系统仿真 3 1.1 SIMULINK和其模块简介 3 2.现代通信系统的介绍 4 2.1 通信系统的一般模型 4 2.2 模拟通信系统模型和数字通信系统模型 5 2.2.1 模拟通信系统模型 5 2.3 模拟通信的优缺点 6 3. 通信系统的仿真原理及框图 6 模拟通信系统的仿真原理 6 3.1 DSB信号的模型 7 3.1.1 DSB信号调制过程分析 8 3.1.2 高斯白噪声信道特性分析 8 3.1.3 DSB解调过程分析 11 3.1.4 程序设计 12 4. 通信系统仿真结果及分析 14 4.1 模拟通信系统结果分析 14 4.1.1 DSB相干解调框图 14 4.1.2 DSB相干解调波形 18 4.1.3 DSB在调制过程中的调制波形 18 4.1.4 调制解调仿真过程图形（程序）： 19 5. 结论 20 参考文献 21 基于SIMULINK的通信系统仿真 摘要 在模拟通信系统中，由模拟信源产生的携带信息的消息经过传感器转换成电信号，模拟基带信号在经过调制将低通频谱搬移到载波频率上适应信道，最终解调还原成电信号。本论文中主要通过对SIMULINK工具箱的学习和使用，利用其丰富的模板以及本科对通信原理知识的掌握，完成了AM、DSB、SSB三种信号的调制与解调，以及用SIMULINK进行设计和仿真。我在本次课程设计中主要负责DSB信号的调制与解调。首先我进行了通信系统的建模以及DSB信号系统的原理研究，然后将学习总结出的相应理论与SIMULINK中丰富的模块相结合实现仿真系统的建模,并且调整参数直到仿真波形输出，观察效果，最终对设计结论进行总结。 关键词 通信系统 调制与解调 SIMULINK? ?? Based on SIMULINK communications system simulation Abstract In simulation of communication system, produced by simulation source carry information news after sensor into electrical signal, analog baseband signal after a low pass spectrum will move to adapt to the carrier frequency channel, eventually demodulation reductive into electrical signals; This paper mainly through Simulink tool box the study and use of the use of its rich templates and the undergraduate course communication principle of the knowledge, and completed the AM, DSB, SSB, three simulation signal modulation and demodulation, and using Simulink for design and simulation. I am in the design of this course is mainly responsible for DSB signal modulation and demodulation.. First of all,I carried on the communication system model and the principle of DSB signal system research, and then will study summarized the corresponding theory and Simulink rich module in combining the modeling of the simulation system is realized, and adjust the parameters of the simulation output waveform until, observing effect, ultimately for design conclusions were summarized in this paper. Keywords Communication system modulation and demodul