LTE在高速列车通信系统中的应用研究
发布时间：2018-09-08 09:27
【摘要】：随着通信技术的高速发展，4G正取代3G成为目前主流的通信网络。它的发展也给铁路通信带来了挑战，特别是给高速铁路通信带来了巨大的挑战。现有的铁路通信网络虽然能够满足人们日常语音业务的需求，但在追求高数据率、多媒体综合业务数字化的今天却是望而止步。MIMO（Multiple-Input Multiple-Output多输入多输出）作为LTE（LongTerm Evolution）的关键技术，，极大地提高了通信系统的信道容量，为铁路通信技术的“数字化”、“无线移动化”、“宽带综合业务”奠定了坚实的基础。MIMO技术不但可以保证列车通信信息的可靠传输，而且还可以满足列车上各用户对多媒体业务的需求。然而铁路目前是以GSM-R作为主要的通信系统，它虽然可以满足旅客对基本的语音和低速率的业务要求，却不能满足未来铁路通信需求。因此，对MIMO技术的研究就显得尤为重要。 MIMO是一种在发送端和接收端都采用多个天线单元来提高系统性能的技术，通过合理的应用空间信道资源，使得系统在不增加信号带宽和发射功率的情况下，成倍的提高数据传输速率以及通信的质量。因此，如何将MIMO系统应用到高铁通信系统中将会是未来铁路通信系统发展的必然趋势。 为了更好的提高铁路通信系统的信道容量，文章在结合高铁呈线状分布的特点以及列车自身的一些优势，并对传统MIMO系统进行优化，得到了一种高铁分布式MIMO系统。通过仿真分析，一方面得到了该系统不仅可以提高通信系统的信道容量而且在对抗阴影衰落方面也有较好的表现；另一方面，在充分考虑硬件成本的情况下，如何在地面天线单元以及列车上安装天线来提高系统性能方面也做了简单的概述。 然而在目前来看，高铁上所用的通信系统仍然是GSM-R系统。该系统虽然能够为普通列车的通信提供较好的可靠性，但在高速铁路环境下由于受到多普勒效应等的影响，使得通信的可靠性降低。因此，论文为了提高GSM-R系统在高铁中应用的可靠性，结合高速列车自身的特点对其越区切换进行了优化。论文结合前人研究成果以及高铁自身特点，对基于地理位置信息的越区切换算法进一步进行改进。通过对该方法的建模、分析、和仿真证明了该方法较传统方法在可靠性方面有了较大的提高。
[Abstract]:With the rapid development of communication technology, 4G is replacing 3G as the mainstream communication network. Its development has also brought challenges to railway communications, especially to high-speed railway communications. Although the existing railway communication network can meet the needs of people's daily voice service, but in the pursuit of high data rate, the digitization of multimedia integrated services is the key technology of LTE (LongTerm Evolution). It greatly improves the channel capacity of communication system, and lays a solid foundation for the "digitization", "wireless mobility" and "broadband integrated service" of railway communication technology. MIMO technology can not only ensure the reliable transmission of train communication information. And can also meet the needs of the train users for multimedia services. However, at present, GSM-R is the main communication system in railway. Although it can meet the requirements of basic voice and low rate services for passengers, it can not meet the future railway communication needs. Therefore, the study of MIMO technology is particularly important. MIMO is a technology that uses multiple antenna units to improve the performance of the system at both the transmitter and receiver, and through the rational application of space channel resources, The system can improve the data transmission rate and the communication quality without increasing the signal bandwidth and transmission power. Therefore, how to apply MIMO system to high-speed railway communication system will be the inevitable trend of railway communication system in the future. In order to improve the channel capacity of railway communication system, this paper combines the linear distribution of high-speed rail and some advantages of the train itself, and optimizes the traditional MIMO system, and obtains a high-speed distributed MIMO system. The simulation results show that the system can not only improve the channel capacity of the communication system, but also has a good performance in countering shadow fading. On the other hand, the hardware cost is fully considered. How to install antenna on ground and train to improve system performance is also briefly introduced. However, at present, the communication system used in high-speed rail is still GSM-R system. Although the system can provide better reliability for the communication of ordinary trains, the reliability of the communication is reduced because of the influence of Doppler effect on high-speed railway environment. Therefore, in order to improve the reliability of the application of GSM-R system in high-speed rail, the paper optimizes the handoff of high-speed train according to its own characteristics. Combined with the previous research results and the characteristics of high-speed rail, this paper further improves the handoff algorithm based on geographical location information. Through modeling, analysis and simulation of the method, it is proved that the reliability of this method is much higher than that of the traditional method.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：2230123
[Abstract]:With the rapid development of communication technology, 4G is replacing 3G as the mainstream communication network. Its development has also brought challenges to railway communications, especially to high-speed railway communications. Although the existing railway communication network can meet the needs of people's daily voice service, but in the pursuit of high data rate, the digitization of multimedia integrated services is the key technology of LTE (LongTerm Evolution). It greatly improves the channel capacity of communication system, and lays a solid foundation for the "digitization", "wireless mobility" and "broadband integrated service" of railway communication technology. MIMO technology can not only ensure the reliable transmission of train communication information. And can also meet the needs of the train users for multimedia services. However, at present, GSM-R is the main communication system in railway. Although it can meet the requirements of basic voice and low rate services for passengers, it can not meet the future railway communication needs. Therefore, the study of MIMO technology is particularly important. MIMO is a technology that uses multiple antenna units to improve the performance of the system at both the transmitter and receiver, and through the rational application of space channel resources, The system can improve the data transmission rate and the communication quality without increasing the signal bandwidth and transmission power. Therefore, how to apply MIMO system to high-speed railway communication system will be the inevitable trend of railway communication system in the future. In order to improve the channel capacity of railway communication system, this paper combines the linear distribution of high-speed rail and some advantages of the train itself, and optimizes the traditional MIMO system, and obtains a high-speed distributed MIMO system. The simulation results show that the system can not only improve the channel capacity of the communication system, but also has a good performance in countering shadow fading. On the other hand, the hardware cost is fully considered. How to install antenna on ground and train to improve system performance is also briefly introduced. However, at present, the communication system used in high-speed rail is still GSM-R system. Although the system can provide better reliability for the communication of ordinary trains, the reliability of the communication is reduced because of the influence of Doppler effect on high-speed railway environment. Therefore, in order to improve the reliability of the application of GSM-R system in high-speed rail, the paper optimizes the handoff of high-speed train according to its own characteristics. Combined with the previous research results and the characteristics of high-speed rail, this paper further improves the handoff algorithm based on geographical location information. Through modeling, analysis and simulation of the method, it is proved that the reliability of this method is much higher than that of the traditional method.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
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3 李汉强,郭伟,郑辉;分布式天线系统MIMO信道容量分析[J];通信学报;2005年08期
本文编号：2230123
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