毕业论文模拟及数字基带系统传输设计与仿真.doc

摘 要

目前，现代计算机科技发展越来越快，与此同时，新一代的可视化的仿真软件也应运而生。这些仿真软件在通信领域发挥了举足轻重的作用。不仅让通信系统设计和开发过程变得更为直观，而且也变得更方便。这就大大地促进了通信系统开发技术的速度。仿真软件具有广泛的适应性和很好的灵活性，为整个社会研究通信系统性能做出来突出贡献。

本次设计的主要探讨方向是通信系统中的关键技术，即模拟调制系统的调制技术和数字基带传输系统的调制技术。模拟调制主要研究模拟调制系统的分类、模拟调制系统的组成、模拟信号的传输方式。数字基带传输系统主要研究常用的传输码型、眼图、码间串扰、噪声干扰、数字基带传输系统的组成。本次设计重点放在模拟调制及数字基带传输的Matlab仿真分析，通过仿真分析，进一步理解并巩固理论知识。这样更便于模拟调制系统和数字基带传输系统在实际生活中的应用。

理论知识来源于实践并运用于实践。本次设计充分利用Matlab仿真软件的强大功能，结合理论知识建立了通信系统的仿真模型。

关键词：模拟调制系统；基带传输系统；Matlab；仿真技术

                                   Abstract

At present, the development of modern computer technology is more and more fast, at the same time, a new generation of visual simulation software also arises at the historic moment. The simulation software has played a decisive role in the field of communications. Not only the communication system design and development process become more intuitive, but also become more convenient. This will greatly promote the speed of the communication system development technology. Simulation software has extensive adaptability and good flexibility, for the society as a whole research on communication system performance made outstanding contributions.

Mainly discusses the direction of this design is the key technology in communication system, namely the analogue modulation system modulation technique and modulation technique of digital baseband transmission system. Analog modulation mainly studies the classification of the analogue modulation system, the composition of analog modulation system, the analog signal transmission way. Digital baseband transmission system is the main research of commonly used transmission type, eye diagram, intersymbol interference and noise interference, the composition of digital baseband transmission system. The design emphasis is placed on the Matlab simulation modulation and digital baseband transmission simulation analysis, through the simulation analysis, further understanding and consolidate the theoretical knowledge. It is easier to simulate modulation system and digital baseband transmission system applied in the practical life.

The theoretical knowledge comes from practice and applied to practice. This design make full use of the powerful features of the Matlab simulation software, combined with theoretical knowledge communication system simulation model is established.

Keywords：analog modulation system; base band transmission system; Matlab; simulation technology

目 录

前 言 1

第1章 模拟调制系统的设计 2

1.1  幅度调制简介 2

1.1.1 模拟调制的分类与特点 2

1.1.2 AM调制原理 2

第2章 数字基带传输系统的设计 8

1.1 数字基带传输系统简介 8

1.2 数字基带信号传输系统的组成原理 8

1.3 基带传输的常用码型 9

1.3.1 几种常用的传输码型 9

1.4 码间串扰简介 10

1.4.1 消除码间串扰的基本思想 10

1.5 眼图 11

1.5.1 眼图简介 11

1.6 数字基带传输系统仿真设计与分析 11

1.6.1  基带系统仿真设计与分析 11

致 谢 17

参考文献 18