（毕业论文）基于无线局域网的室内定位与预测.docx

重庆邮电大学本科毕业设计(论文) - 1- 摘要近年来,基于无线局域网( WLAN )的无线网络已经覆盖到大部分的公共场所。移动运营商在机场、酒店、商务楼宇等室内区域的网络布置也越来越完整,基于 WLAN 的增值业务呼之欲出。基于接收信号强度的 WLAN 定位是根据接收信号强度随距离变化而变化的规律进行定位,它不需要添加额外的硬件设备来进行精确的时间同步和角度测量,能充分利用现有的无线网设施,将定位系统的应用范围扩大到楼群和室内,降低成本。论文主要介绍在复杂室内环境中路由器发射无线信号强度的预测与分析。为了更好地使室内环境中的信号强度达到一个合理的覆盖,通过提前采样实际环境中某点的信号强度,代入对数距离路径损耗模型进行运算,可以计算出其它位置的信号强度。根据计算得出的结果,可以预测其他位置的接收信号强度的大小,从而来达到更好的路由布局。论文用软件 MATLAB 中界面设计与图像处理,结合无线信道传输方面的知识, 设计出一个用户操作界面。用户通过该操作界面,可以预测出不同位置处距离各个 AP 点的接受信号强度。【关键词】无线定位 WLAN 无线信道自由空间传播模型室内空间传播损耗对数路距离路径损耗模型重庆邮电大学本科毕业设计(论文) - 2- ABSTRACT In recent years, the work (WLAN) based on wireless local work has covered most of the public places . Mobile operators has plete d work arrangement in indoor area s, like airports, hotels, commercial buildings . The value-added services based on WLAN is getting ready for the society . WLAN positioning r eceived signal strength is based on the received signal strength var ying with distance and the variation of location-based, it does not need additional hardware to carry out precise time synchronization and angle measurement, can make full use of the existing work facilities . It will expand the range of applications of positioning systems to buildings and indoor ,and reduce costs. The p aper describes how to analysis and predict wireless routers transmit ting signal strength plex indoor environment. In order to make the indoor environment ’s signal strength reach ing a reasonable coverage , we can sampl e the signal strength of the actual environment ofa point in advance. By putting the sample values into a logarithmic distance path loss model calculat ing, we can calculate the signal strength of the other locations. According to the calculated results ,we can predict the received signal strength of other locations, achiev e the better routing layout. The p aper design a user interface by the software interface and image processing in MATLAB, combin ing with the knowledge of wireless channel transfer ring . Through the user interface, yo