基于MIMO的通信系统仿真与分析研究毕业设计论文 精品

毕业设计（论文）

设计（论文）题目：

基于MIMO的通信系统仿真与分析研究

重庆邮电大学本科毕业设计（论文）

摘 要

随着移动通信的快速发展，用户数量与用户需求的急剧攀升，使得移动通信成为了通信界最具有市场潜力的技术。而无线通信与有线通信比较时暴露出来的弱点，如移动信道环境恶劣、用户使用突发性大等，使得提高无线通信的容量和质量需要诸多突破点。所以短缺的频谱资源刺激着人们向提高频谱利用率的方向努力。

自二十世纪九十年代MIMO（Multiple-Input Multiple-Output，多输入多输出）技术提出以来，由于在提高信道容量方面取得的突出成果，逐渐被无线通信领域的多个标准所应用，成为了在提供可靠无线传输链路方面一个重要突破。

MIMO技术是由多天线分集技术和空间编码技术相结合而产生的，它的一个很重要的特点就是：不再是对抗多径效应，而是巧妙地利用它。随着研究人员对MIMO通信系统理论、算法、应用等各个方面越来越多的研究，其已经成为了通信技术中的热门课题。

本文首先介绍了MIMO技术的基本原理和MIMO通信系统的信道模型，然后简要介绍了本文研究使用的仿真工具，即MATLAB/Simulink仿真软件。其后通过理论推导与软件仿真对MIMO通信系统的信道容量进行了研究，总结了各因素对信道容量的影响。最后本文对基于正交空时分组编码的MIMO通信系统进行了仿真。

【关键词】频谱利用率 MIMO通信系统 信道容量 正交空时分组编码

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重庆邮电大学本科毕业设计（论文）

ABSTRACT

With the rapid development of the mobile communications, the sharp rise in the number of users and the need of users making the mobile communications has become to the most potential technology in the communication market. However, when compared the wireless communications to the wired communications, the weaknesses unfolded. Such as the poor mobile channel environment, the sudden rise or down of the number of users or other characteristics, makes the improvement of the capacity and the quality of wireless communication needs many breakthroughs. But the shortage of spectrum resources stimulates people to improve the spectrum utilization.

Since the 1990s, MIMO (Multiple-Input Multiple-Output) technology has been gradually applied to several standards of wireless communications and become an important breakthrough in many aspects, such as providing reliable wireless transmission link, for the outstanding achievements in improving the channel capacity.

MIMO technology is combined with multi-antenna diversity technology and spatial coding technology. One of the most important features of MIMO technology is not confronting multipath effects, but using it cleverly. With more and more studies in the theory, algorithms, applications, etc. of MIMO communication systems by many researchers, it has become a hot topic in communications technology.

Firstly, we will describe the basic principles of the MIMO system technology and the MIMO channel models in this paper. Then I will describe the simulation tool, MATLAB / Simulink simulation software briefly. Next, this paper will study the theoretical derivation and simulation software for the channel capacity of MIMO systems and sum up the impact of various factors on the channel capacity. Finally, a simulation of the MIMO communication system based on orthogonal space-time block coding will be given in this paper.

【Key words】Spectrum utilization MIMO communication system Channel capacity Orthogonal space-time block coding

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重庆邮电大学本科毕业设计（论文）

目 录

前 言 ................................................................................................................................... 1 第一章 MIMO技术的概述 ............................................................................................... 3 第一节 MIMO技术发展历史和现状 ........................................................................... 3 一、发展历史 ................................................................................................................ 3 二、现状 ........................................................................................................................ 3 第二节 仍存在的问题与发展趋势 ............................................................................... 4 一、仍存在的问题 ........................................................................................................ 4 二、发展趋势 ................................................................................................................ 5 第三节 MIMO技术原理 ............................................................................................... 5 一、天线分集技术 ........................................................................................................ 5 二、空时编码技术 ........................................................................................................ 7 第四节 MIMO通信系统模型 ....................................................................................... 8 第五节 MIMO通信系统信道模型 ............................................................................. 10 第六节 本章小结 ......................................................................................................... 12 第二章 MATLAB/Simulink仿真工具介绍 ................................................................... 13 第一节 概述 ................................................................................................................. 13 第二节 通信系统仿真方法与流程 ............................................................................. 13 第三节 Simulink仿真概述 .......................................................................................... 14 第四节 Simulink通信工具箱仿真模块与S-函数 ..................................................... 15 一、通信工具箱 .......................................................................................................... 15 二、S-函数 .................................................................................................................. 16 第五节 本章小结 ......................................................................................................... 16 第三章 MIMO信道容量仿真与分析研究 ..................................................................... 17 第一节 信道容量计算概述 ......................................................................................... 17 第二节 仿真与结果分析 ............................................................................................. 19 一、相同信噪比、相同接收天线下的仿真 .............................................................. 20 二、不同信噪比、相同接收天线下的仿真 .............................................................. 20 三、不同信噪比、相同发射天线下的仿真 .............................................................. 21 四、相同信噪比、不同接收天线下的仿真 .............................................................. 22 第四节 本章小结 ......................................................................................................... 23

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重庆邮电大学本科毕业设计（论文）

第四章 MIMO正交空时分组的仿真 ............................................................................. 25 第一节 MIMO通信系统与空时分组编码 ................................................................. 25 第二节 正交空时分组编码、译码与性能分析 ......................................................... 26 一、正交空时分组编码 .............................................................................................. 26 二、正交空时分组码译码 .......................................................................................... 26 三、正交空时分组码性能分析 .................................................................................. 27 第三节 4-QAM与其他调制方式下的仿真与结果分析 ............................................ 28 第四节 本章小结 ......................................................................................................... 34 结 论 ................................................................................................................................. 35 致 谢 ................................................................................................................................. 36 参考文献 ............................................................................................................................. 37 附 录 ................................................................................................................................. 38 一、英文原文 ................................................................................................................. 38 二、英文翻译 ................................................................................................................. 43 三、工程设计图纸 ......................................................................................................... 47 四、源程序 ..................................................................................................................... 49

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