文档介绍：中文摘要摘要:近年来,随着信息化社会的逐步推进,我国高速铁路和轨道交通取得了举世瞩目的成就。同时,高速列车与地面的无线通信(包括列车控制信息和面向用户的宽带无线接入业务)需求也呈逐年上升的趋势。目前,列车上的乘客使用的2G、3G无线蜂窝系统通信对高速移动环境的支持较差,导致通话质量下降、掉话、数据速率严重下降的问题。本文从国内外现今的技术入手,以35㈣高速运行宽带无线接入为研究对象,着重研究了高速运行下宽带无线接入的系统架构并对其进行了可行性分析,为解决或减弱高速运行带来了快速越区切换、多普勒频移、无线信道快速时变等提出了解决思路。本文设计了一套高速铁路无线宽带接入网络系统架构,、WiMaX技术和在高速移动环境下系统中己广泛推广的RoF(Radio over Fiber)技术。由于WiMa】【技术在高速移动环境下使用还没有成功实践,本文对WiMax技术进行了深入分析并提出了一种适合于高速铁路的wiMaX传播模型;同时,本文基于RoF技术的自身优势并结合了移动小区技术的设计,在很大程度上降低了多普勒频移和快速越区切换对系统的影响。本文对所提出系统架构进行了分析与仿真,得到了一些初步的结果。图38,表13个,参考文献60篇。关键词:;宽带接入;多普勒频偏;wiMaX; RoF;传播模型;移动小区分类号: ABSTRACT ABSTRACT:Wim me rapid developmem ofiIlfo衄ation_baSed society,China Railway H砂Speed hasmader锄破able tlles锄e time,t11ere is a11 ascending仃end fordemand hi曲speed仃ains andground wireless coIIlIIlullication, including昀in aIlduser—orientedbroadbaJld wireless access business. At present, second generation aIld tllird generation cellular mobile teleco瑚muIlication systems ispoor insupportillghi曲speed muIlication, resulting inreduced callquality,droppedcalls,s砸ouS depletion ofdata paper we willfocus on thearcllitecture of11i曲speed broadband wireless access syst锄 aIld itsaIlaJySis aIldfeasibility,wllich isdirected atwirelessbroadb锄d access be觚een 350km/ll aIld 500km/ also,we willpropose asolution toresolVe orreducethe problem inhi曲Speed mobile co舢mullication,such as f瓠thaIldo危the Doppler f沁quency shia,fasttime—Varying wirelessch咖e1. BaSed onWiFi alldWiMaX under broadbaIld wireless access system,aJld Radio over Fiber(RoF)under hi曲speed mumcation,we pr叩ose an architectl】I。e onhi曲一speed wireless broadband access wiMax has not been ess如lapply tohi曲speed mobile conlIIlullication,we Willdo anin-d印thanalysis of WiMax andbuild aWiMaX conductionmodel印plied tohi曲speed me s锄e time,we will use theadvantages bined with the design ofmobile techn0109y munity toreduce on ,perfonllance results ofth