GSM系统网络信号的室内覆盖的设计论文.doc

PAGE 毕业设计论文GSM系统网络信号的室内覆盖的设计毕业设计(论文)中文摘要摘要：随着社会的发展，城市中移动通信用户的飞速增加以及高层建筑越来越多，话务密度和覆盖要求也不断上升。由于现代城市建筑都是框架结构，而且规模大，对移动通信信号有很强的屏蔽作用。在大型建筑物的底层、地下商场、地下停车场等环境，移动通信信号弱，形成了移动通信的盲区；在中间楼层，由于来自周围不同基站信号的重叠，产生乒乓效应，手机频繁切换，甚至掉话，严重影响了手机使用；在建筑物的高层，由于受基站天线的高度限制，无法正常覆盖，也是移动通信的盲区；在有些建筑物内，虽然手机能够正常通话，但是用户密度大，基站信道拥挤，手机通上网困难。可见，室内覆盖已成为急待解决的问题之一。本文从GSM网络的室内分布系统概述及产生背景，存在的问题和典型的解决方案入手，介绍了室内分布系统建设的必要性、系统的类型及特点；通过对微蜂窝和直放站两种覆盖方式的比较分析，设计了一套室内分布系统建设方案和传输方案。关键词：GSM,乒乓切换效应；室内覆盖毕业设计(论文)外文摘要Title : GSM system network signal room covers design Abstract: With the development of society, the city of mobile communications users rapid increase and high building more and more, traffic density and cover requirements are rising. Because the modern urban architecture frame structure, and large scale on the mobile communication signals have very strong shield effect. In the bottom of the large buildings, and underground shopping malls, underground parking lot environment, and the mobile communication signal is weak, formed the mobile communication of blind area; In the middle of the floor, due to the different from around the base station signal overlap, produce table tennis effect, cell phone frequent switching, and even drop the words, serious impact on the mobile phone use; In the high-rise buildings, as the base station antenna height limit, cant normal coverage, also is the amount of mobile communication; In some buildings, although cell phones can normal conversation, but the user density, base station channel crowded, the mobile phone Internet difficult. Visible, indoor coverage is the urgent problem. This article from the GSM network distribution system overview of indoor and background, problems and solutions of the typical, introduces indoor distribution system construction necessity, the system of types and characteristics; Through to the microcells and direct put two cover means standing of comparative analysis, design a set of indoor distribution system construction scheme and transmission scheme