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东华理工大学毕业设计(论文)摘要I摘要随着社会经济发展的需要，国家大力投入高速铁路事业。近几年，我国高速铁路通信部分的建设发展速度很快。但是高铁移动信号覆盖仍是一个世界性难题，速度快、信号衰落快是高铁最大的挑战。手机需要在不同的基站服务区域间进行切换“接力”；同时新型全封闭的车厢对手机信号衰减很大，信号强度减小为原来的1/256。如果用现有的网络去覆盖高铁，接通率只能达到70%～80%。，而掉话率高达20%～30%。而通过架设GRRU“专网”，中国移动通信掉话率降到0.53%，基本实现30分钟不掉话的理想状态。根据目前高速铁路通信建设现状与发展趋势，人们对高速铁路通信质量的强烈需求的现状，本文选择了对高速铁路无线信号覆盖问题进行分析、研究和实践。并希望可以以此来更深入了解高速铁路通信系统。并希望将来能为高速铁路信号覆盖的建设和推动国家经济发展做些力所能及的贡献。本文首先介绍了数字光纤直放站GRRU原理及在GSM-R应用，而后，本文对数字光纤直放站GRRU关键技术软件无线电和射频拉远系统进行讲解之后，本文用我公司GRRU在高铁上的一个应用案例进行了介绍说明。最后，对本文进行了总结.关键词：数字光纤直放站GRRU；射频拉远技术；高铁；无线信号东华理工大学毕业设计(论文)AbstractIIAbstractAlongwiththesocialeconomydevelopmentneeds,nationalenergeticalintohigh-speedrailwaycareer.Inrecentyears,ourcountry'shigh-speedrailwaycommunicationpartoftheconstructiondevelopmentspeedquickly.Buthighironmobilesignalcoverageisstillaworldwideproblem,speed,signaldeclinefasterishighiron'sbiggestchallenge.Cellphoneneedsatdifferentbasestationserviceareasbetweentheswitchrelay;Meanwhilenewtotallyclosedcarriageofcellphonesignalattenuation,signalintensitydecreasesgreatlyfortheoriginalwere256toone.Ifuseexistingnetworktocoverhighiron,connectioncanonlyreach70%to80%.And20%or30%optimizationsome.AndthroughGRRUprivatenetwork,erectionofChina'smobilecommunication,torealizethebasicoptimization.somehad30minutesdon'tdropthewordsoftheidealsituation.Accordingtothecurrenthigh-speedrailwaycommunicationconstructionsituationanddevelopmenttrendofhigh-speedrailwaycommunication,peoplepresentsituationofthequalityofstrongdemand,thispaperchosetohigh-speedrailwaywirelesssignalcoverageproblemsareanalyzed,researchandpractice.AndIhopecaninordertofurtherunderstandthehigh-speedrailwaycommunicationsystem.AndIhopethefuturehigh-speedrailwaysignalcoveragefortheconstructionandpromotenationaleconomicdevelopmentdothecontribution.Thispaperfirstintroducesthedefinitionandputstandingstraight,andthencomparedwithbasestation,thispaperGRRUdigitalstraightputstationplayfardigitalrfapplicationsystemexplained;Later,thispaperusemyGRRUhighinirononthecaseofanapplicationoftheexplanation;Finally,summarizedforthisarticle.Keywords:DigitalGRRUfiberopticrepeater;Rfpullfartechnology;putstationHighiron;Wirelesssignals东华理工大学毕业设计(论文)目录III目录摘要····································································································IABSTRACT································································································II绪论···································································································11．光纤拉远基站系统概述······································································21.1数字光纤直放站GRRU原理······························································21．2数字光纤直放站GRRU的基本特点·····················································31．3数字光纤直放站GRRU在GSM一R的应用形式··································42．高铁中的通信问题及GRRU的关键技术··················································52．1高铁无线信号覆盖提速后存在问题···················································52.2基于数字光纤直放站GRRU关键技术···············································62.2.1软件无线电技术········································································62.2.2软件无线电的核心思想·······························································62.2.3射频拉远技术···········································································72.3高速铁路覆盖意义········································································93．GRRU产品在高铁的运用····································································103．1昌九城际高铁网络现状·································································103.2昌九高铁南昌段方案设计······························································103.2.1设计依据················································································103.2.2总体思路················································································103.2.3总体规划················································································113.2.4站点明细················································································123.3昌九城际高铁南昌段专网覆盖分析··················································153.3.1信号覆盖强度分析····································································153.3.2小区容量分析··········································································183.3.3小区切换分析··········································································193.3.4位置边界区分析·······································································213．4昌九高铁南昌段专网网络优化建议··················································223.4.1专网与大网的关系····································································223.4.2专网频率规划原则····································································233.4.3专网信道配置原则····································································23结束语·······························································································24致谢··································································································25参考文献····························································································26附录一·························································