【作者】 张昊；

【导师】 郝莉；

【作者基本信息】 西南交通大学 ， 通信与信息系统， 2013， 硕士

【摘要】 近些年,高速铁路在我国乃至全世界发展迅猛,人们在享受高速快捷的旅行同时,渴望在旅途中也能获得与地面同样的移动网络服务。此外,列控系统离不开车载台与调度台之间的通信,然而,列车在高速运动下,受多普勒频移等影响,通信系统的性能急剧下降,这也为行车安全带来了严重的隐患。因此,研究高速运动对通信系统的影响及提出适宜于高速铁路的通信系统方案,正在成为研究热点。2008年,3GPP提出了满足ITU制定的IMT-Advanced技术需求的LTE-Advanced,其目标是成为IMT-Advanced的候选技术。如今,LTE-A的发展已经日趋成熟,终有一天,LTE-A会应用于高铁车地通信。现有LTE-A的技术标准是否能满足高铁通信环境下的性能要求,针对高铁通信环境,现有LTE-A系统的通信方案又该做出怎样的改进,成为人们关注的焦点。而验证一个通信方案或通信部署的性能表现离不开系统级仿真。本文正是设计了一种基于高铁车地通信环境,基于LTE-A系统的系统级仿真平台。通过该仿真平台,可以有效的确定某一通信技术对高铁环境下系统性能的影响,在未来可以成为,验证沿高铁线路架构的LTE-A网络部署方案的有效手段。此外,鉴于多基站协作技术在LTE-A系统中的重要性和其在优化系统性能方面的突出表现,在本文的第二部分,结合高铁通信场景特点,对现有多基站协作技术方案做出修改,利用已设计实现的系统级仿真平台,通过比较不同多基站协作方案对系统性能的影响,分析几种方案的优缺点,并最终提出了适合于高铁场景的多基站协作方案。更多还原

【Abstract】 Recently, it’s amazing that high-speed railway system has rapid developments in China and abroad. People expect to acquire a high quality of mobile communication services as at home while traveling in high-speed. In addition, train control system is based on wireless communication between train and the dispatch center. However, affected by Doppler frequency shift, the quality of communication system degrads while the train moved fast, which results in the serious insecurity of train. To deal with this situation, researches on the impacts over communication exerted by high as well as the possible solution have aroused much concern.In2008,3GPP suggested LTE-Advanced so as to meet the requirements of IMT-Advanced, and expected it could be a candidate of IMT-Advanced. LTE-A has been under well development now, sooner or later, it will be used in High-speed railway. People wonder whether LTE-A can perform well and whether it should be changed to meet the requirements of High-speed railway. In this paper, a system-level simulation platform for high-speed railway is developed based on LTE-A. The platform can evaluate the performance of the communication system effectively, and is the foundation of designing a communication system which can meet the requirements of High-speed railway.Apart from that, considering the importance of CoMP in LTE-A as well as its advantage over other technologies, we apply COMP to high-speed railway train-ground communication system. On the basis of the comparison among several CoMP schemes through system-level simulation platform, a CoMP scheme for High-speed railway system is proposed.更多还原