摘要路径损耗的计算是建设 WLAN 所必须进行的工作，WLAN 传播时的损耗是分 析 WLAN 传输效率参考依据。因而，WLAN 路径传播损耗的计算是分析 WLAN 其 他性能的重要前提条件，其准确性影响到 WLAN 规划的准确性和可靠性。72266

本文首先分析了构建 WLAN 所需要的无线设备、无线信号传播所需要的介质、 WLAN 应用的通信技术以及 IEEE 802。11 标准所代表的意义及其主要任务，然后选 择 COST231 Hata 模型与 Okumura Hata 模型分别对室外无线信号路径损耗进行仿真， 探求接收点(STA)天线高度、发送点(AP)天线高度、接收点(STA)天线站台与发送点 (AP)天线站台之间的距离与损耗的关系，并在频率 1500MHz 情况下对两种模型所计 算的损耗进行对比。最后，本文还对引起室内无线网路传播路径损耗的因素进行了 分析。本文能够为测定无线网络路径损耗值提供参考依据，还在临界频率 1500MHz 测量无线网络路径损耗具有理论价值。

本文有图 20 幅，表 19 个，参考文献 26 篇。

毕业论文关键词：无线网络 路径损耗 Hata COST231

Calculation and Simulation of Path Loss of Wireless Network

Abstract The calculation of the path loss is the work that must be carried out in the construction of WLAN,and the loss of WLAN is a reference for the analysis of the transmission efficiency of WLAN。 Therefore, the calculation of WLAN path propagation loss is an important prerequisite for the analysis of other properties of WLAN, and its accuracy affects the accuracy and reliability of WLAN planning。

Firstly,this article analyzes main tasks of construction of WLAN of wireless devices, wireless signal propagation medium, WLAN applications of communication technology and the IEEE 802。11 standard。 Secondly, choosing the COST231 Hata model and Okumura Hata model imitate outdoor wireless signal path loss respectively in order to obtain the relationship among STA height, AP height,STA platform to the AP platform distance with the path loss, and in frequency 1500MHz of the two models the calculated loss were compared。 Lastly, the factors that cause the indoor path loss are analyzed in this paper。 The article can provide reference for determination of the  wireless network path loss values, also wireless network path loss measurement has the theory value in the critical frequency 1500 MHz。

The paper has 20 figures, 19 tables, 26 references。

Key word:Wireless network Path loss Hata COST231

目 录

摘要。。。Ⅰ

AbstractⅡ

目录。。。Ⅲ

图表清单。。 Ⅴ

重要缩写与变量注释表。 Ⅴ

1 绪论 1

1。1 课题研究背景及意义 1

1。2 无线通信的发展过程 1

1。3 文献综述 2

1。4 本文主要内容介绍 2

2 无线网络及其相关调制设备调频技术的知识 3

2。1 无线网络与有线网络及比较 3

2。2 无线网络介质——射频 3

2。3 无线网络的传输过程 5

2。4 无线局域网的基本干扰 5

2。5 扩频通信技术 5

2。6 无线网络设备