摘要伴随着我国高铁的迅猛发展和在全球范围内对高铁的大力推广,已经部署将铁路专用的无线通信GSM-R系统平滑过度至LTE系统。高速铁路的小区呈链状连接,列车位置变化迅速，轨道铺设环境迥异，通信信道不间断发生改变，系统需保证其所传列控信息是安全可靠的。本文针对高铁环境下LTE系统的可靠传输问题,从自适应调制编码和切换位置的选取两个方向进行研究，给出优化设计方案并仿真验证。69875

主要的研究内容：第一，高铁LTE系统的链路层在发展中继续使用AMC技术与HARQ技术，逐步设计了以区分业务为基础的跨层设计方案、基于有限状态Markov信道建模方案与自适应传输方案，来满足高速环境下信息快速可靠传输的要求。第二，对LTE系统的小区切换技术实行进一步分析仿真，根据得到的不同切换参考点对整体切换技术的影响，通过参考点的选取来优化高铁信道的传输可靠性。

该论文有图24幅，表5个，参考文献25篇。

毕业论文关键词： LTE  高速移动  跨层设计  可靠性

High-speed Rail Link Transmission Optimization Design LTE System

Abstract With the high-speed developing rapidly in our country, the special railway wireless communication system has been deployed GSM-R smooth evolution to LTE-R.Zonal distribution, fast moving speed of the terminal, along the complex environment, channel change speed, communication system can carry train control information on the requirements of high security and reliability of.In this paper, based on the link of LTE system in high speed railway scenario, an optimized design scheme is proposed by studying the adaptive modulation coding and location management technology.

At present the railway GSM-R system to LTE railway system smooth evolution,to meet the high data rate and reliable communication requirements. In one side, a detailed description of LTE railway system business model, ; secondly, the existing QoS bearing is not applicable, proposes a cross layer design scheme of adaptive modulation encoding differentiated service based on HARQ; finally, for due to the high speed movement caused by the decrease of the error rate.In the other side,Mobility management is the cornerstone of cellular mobile communication system architecture based on the need for special scene optimization design, combined with the engineering of high speed railway network switching technology based on geographic location,obtained the different switching reference point including the failure rate of the link (RLF), packet loss rate (PLR) and switching performance index.

Key words: LTE  high speed mobile  cross layer design  reliability

目录

摘要.Ⅰ

Abstract.Ⅱ

1 绪论..1

1.1课题研究背景..1

1.2国内外研究现状.1

1.3本论文的主要工作3

2 LTE系统自适应技术及LTE通信系统切换技术5

2.1LTE链路自适应技术5

2.2LTE铁路专用业务分析..8

3 基于高铁场景下的AMC-HARQ跨层设计.12

3.1AMC-HARQ跨层设计原理12

3.2区分业务在铁路通信上的应用13

3.3基于链路自适应的跨层设计.14

3.4误包率与频谱效率对传输可靠性的影响..15

3.5仿真结果及分析18

4 高铁场景下FSMC模型传输分析究.20

4.1高铁信道特性分析..20

4.2高铁场景有限状态Markov信道模型.22

4.3基于FSMC模型的自适应传输方案24

5 基于切换位置管理技术的优化方案..26

5.1LTE切换流程..26

5.2基于地理位置切换研究26

5.3高铁场景下切换位置管理优化方案.26

6 总结与展望.35

6.1论文工作总结.35

6.2不足与展望..35