LTE在高速列車通信系統(tǒng)中的應用研究
發(fā)布時間：2018-09-08 09:27
【摘要】：隨著通信技術的高速發(fā)展，4G正取代3G成為目前主流的通信網絡。它的發(fā)展也給鐵路通信帶來了挑戰(zhàn)，特別是給高速鐵路通信帶來了巨大的挑戰(zhàn)�，F(xiàn)有的鐵路通信網絡雖然能夠滿足人們日常語音業(yè)務的需求，但在追求高數(shù)據(jù)率、多媒體綜合業(yè)務數(shù)字化的今天卻是望而止步。MIMO（Multiple-Input Multiple-Output多輸入多輸出）作為LTE（LongTerm Evolution）的關鍵技術，，極大地提高了通信系統(tǒng)的信道容量，為鐵路通信技術的“數(shù)字化”、“無線移動化”、“寬帶綜合業(yè)務”奠定了堅實的基礎。MIMO技術不但可以保證列車通信信息的可靠傳輸，而且還可以滿足列車上各用戶對多媒體業(yè)務的需求。然而鐵路目前是以GSM-R作為主要的通信系統(tǒng)，它雖然可以滿足旅客對基本的語音和低速率的業(yè)務要求，卻不能滿足未來鐵路通信需求。因此，對MIMO技術的研究就顯得尤為重要。 MIMO是一種在發(fā)送端和接收端都采用多個天線單元來提高系統(tǒng)性能的技術，通過合理的應用空間信道資源，使得系統(tǒng)在不增加信號帶寬和發(fā)射功率的情況下，成倍的提高數(shù)據(jù)傳輸速率以及通信的質量。因此，如何將MIMO系統(tǒng)應用到高鐵通信系統(tǒng)中將會是未來鐵路通信系統(tǒng)發(fā)展的必然趨勢。 為了更好的提高鐵路通信系統(tǒng)的信道容量，文章在結合高鐵呈線狀分布的特點以及列車自身的一些優(yōu)勢，并對傳統(tǒng)MIMO系統(tǒng)進行優(yōu)化，得到了一種高鐵分布式MIMO系統(tǒng)。通過仿真分析，一方面得到了該系統(tǒng)不僅可以提高通信系統(tǒng)的信道容量而且在對抗陰影衰落方面也有較好的表現(xiàn)；另一方面，在充分考慮硬件成本的情況下，如何在地面天線單元以及列車上安裝天線來提高系統(tǒng)性能方面也做了簡單的概述。 然而在目前來看，高鐵上所用的通信系統(tǒng)仍然是GSM-R系統(tǒng)。該系統(tǒng)雖然能夠為普通列車的通信提供較好的可靠性，但在高速鐵路環(huán)境下由于受到多普勒效應等的影響，使得通信的可靠性降低。因此，論文為了提高GSM-R系統(tǒng)在高鐵中應用的可靠性，結合高速列車自身的特點對其越區(qū)切換進行了優(yōu)化。論文結合前人研究成果以及高鐵自身特點，對基于地理位置信息的越區(qū)切換算法進一步進行改進。通過對該方法的建模、分析、和仿真證明了該方法較傳統(tǒng)方法在可靠性方面有了較大的提高。
[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.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5
本文編號：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.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5
【參考文獻】
相關期刊論文 前3條
1 趙亞男,張祿林,吳偉陵;MIMO技術的發(fā)展與應用[J];電訊技術;2005年01期
2 吳昊;谷勇浩;鐘章隊;;一種應用于高速鐵路的GSM-R快速切換算法研究[J];鐵道工程學報;2009年01期
3 李漢強,郭偉,鄭輝;分布式天線系統(tǒng)MIMO信道容量分析[J];通信學報;2005年08期
本文編號：2230123
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