文档介绍：??? Research on High-Speed Railway work Planning and Optimization Technology Thesis Submitted to Nanjing University of Posts and munications for the Degree of Master of Engineering ? By Zhai Bingyin Supervisor: Prof. Yao Jianguo March 2013 I 摘要随着越来越多的高速铁路的开通,高速铁路通信的话题备受通信界所关注。高速铁路列车因其高时速性和良好的密闭性致使无线通信面临强烈的多普勒频移、明显的车体穿透损耗和频繁的小区切换等挑战,加之高速铁路沿线场景非常丰富,高速铁路无线网络建设面临一系列难题。本文从 CDMA 理论基础出发,结合高速铁路 CDMA 无线网络建设的实践经验,分析了高速铁路无线通信面临的挑战,包括多普勒频移、车体穿透损耗、快速小区切换和丰富的通信场景;总结了近年来高速铁路 CDMA 无线网络建设的链路预算、覆盖规划、组网策略、切换设置、容量规划、站点选择等工程实践经验。在此基础上,结合江苏高速铁路 CDMA 网络建设,详细探讨了高速铁路无线网络通信难题的解决方法,并针对江苏境内高速铁路经过的高架桥梁、隧道和“ U ”型槽等特殊场景,给出了不同场景下的覆盖方式,通过对不同场景的前、反向链路预算给出了小区覆盖范围,通过不同场景的列车时速和切换延迟的分析给出了切换重叠区大小,通过对不同场景的“线容量”计算分别给出 CDMA2000 1X ( CDMA2000 的第一阶段,属于 代技术)和 CDMA2000 1X EV-DO ( Data Only , 1X 系统的增强技术) 业务的近期及中远期容量规划方案。针对江苏高速铁路 CDMA 网络具体的规划设计方案,在站点查勘的基础上,采用了 公司的 Enterprise ( 3G )仿真软件进行了规划仿真,通过对仿真的分析验证了规划方案的可行性。高速铁路运营后又通过对实际网络进行了拨打测试,通过对实际测试数据的分析,证明了江苏高速铁路 CDMA 无线网络建设工程实现了精品覆盖。关键词: CDMA; 链路预算; 线容量; 传播模型; 蒙特卡洛仿真? II Abstract With the development of high-speed railway,t he high-speed munication has been received more attention .Because of its high sp eed and good tightness, the high-speed railway cause the munication chal lenges ,facing strong Doppler frequency shift, obvious body ration loss and frequent cell switching. The paper illustrates the theory of CDMA a bines with the high-speed railway CDMA network construction expe rience, analyzes the challenges of the high-speed railway wireless communication,including the Doppler shifts, the ration loss, fast ce ll switching and various communication ,the thesis summari zes the general practices in CDMA wireless network construction under the high speed circum stances which include link budget, coverage the planning, networking strategies, cell switching setti ng, capacity planning and site this basis,the paper bination with the constr uction of Jiangsu high-speed railway in CDMA network,and disc