摘 要 移动通信最近几年得到了突飞猛进的发展，人们对无线信道的研究也成了当前通信行业的主题，特别是对无线信道的建模与仿真也受到了许多学者的关注,在这个领域的研究也取得了很大成果。无线信道模型分为自由空间模型、无线视距模型和经验模型，本文首先研究了无线信道模型的特点，建立了无线信道的的模型，对自由空间模型和经验模型Okumura-Hata模型、COST-231 Hata模型以及COST231-WI模型进行了比较，并将其用Matlab软件仿真，对仿真结果进行了分析。 关键字：无线信道、Hata模型、COST231-WI模型 Abstract Mobile communication several years obtained the development recently which progresses by leaps and bounds, The people have also become the current correspondence profession subject to the wireless channel research. Specially has also received many scholars' attention to the wireless channel modeling and simulation, Has also yielded the very big result in this domain research. Wireless channel model is divided into free space model, the wireless line of sight and empirical model, this paper studied the characteristics of wireless channel model is established radio channel model, on the free space model and empirical model Okumura-Hata model, COST-231 Hata model and COST231-WI model were compared, using Matlab software to simulate, the simulation results are analyzed. Keywords: Wireless channel, Hata model, COST231-WI model 目 录 第一章 绪论 .............................................................................................................................................................. 4 1.1 无线通信的发展和建模仿真的发展状况 ................................................................................................ 4 1.1.1 无线通信的发展 ............................................................................................................................ 4 1.1.2 信道建模仿真技术的发展概况 .................................................................................................... 4 1.2 本文研究的内容 ........................................................................................................................................ 5 第二章 无线信道的概念和无线信道的模型 .......................................................................................................... 6 2.1 无线信道的概念 ........................................................................................................................................ 6 2.1.1 无线信道的定义 ............................................................................................................................ 6 2.1.2 无线信道的特点 ............................................................................................................................ 6 2.2 无线信道的模型 ...................................................................................................................................... 15 2.2.1 自由空间传播模型 ...................................................................................................................... 15 2.2.2 无线视距传播模型 ...................................................................................................................... 17 2.2.3 无线信道经验模型 ...................................................................................................................... 19 第三章 无线信道建模仿真及结果分析 ................................................................................................................ 30 3.1 Matlab软件介绍 ..................................................................................................................................... 30 3.2 路径损耗模型仿真及结果分析 .............................................................................................................. 30 3.2.1 自由空间模型仿真及结果分析 .................................................................................................. 30 3.3 经验模型仿真及结果分析 ...................................................................................................................... 32 3.3.1 Okumura-Hata模型仿真及结果分析 ......................................................................................... 32 3.3.3 COST-231 Hata模型仿真及结果分析 ....................................................................................... 34 3.3.5 COST231-WI模型仿真及结果分析 ............................................................................................. 36 结 论 .................................................................................................................................................................... 39 参 考 文 献 ............................................................................................................................................................ 41 附 录 ...................................................................................................................................................................... 42 中英文翻译 ...................................................................................................................................................... 42 Matlab程序 ..................................................................................................................................................... 49 致 谢 .................................................................................................................................................................... 54