数字直放站在GSM-R系统应用中的技术研究

Technology Research of Digital Repeater in GSM- R System

研究目的:目前我国GSM-R网络在隧道、路堑等弱场区主要采用模拟直放站延伸基站覆盖,基站+模拟直放站覆盖方案,存在基站设置过密导致同频、邻频干扰,切换次数多影响Qo S质量,模拟直放站无法解决多径时延带来的同频干扰和上行干扰噪声叠加等一系列问题。采用数字光纤直放站延伸GSM-R基站覆盖是解决上述一系列问题的方式。如何解决,数字光纤直放站还有哪些不足及需要改进之处,需要进行专门技术研究。研究结论:(1)与传统的模拟直放站相比,数字直放站具有更多优点;(2)数字直放站应用于GSM-R系统,能解决由时延造成的多径干扰和上行干扰噪声叠加等问题;(3)数字直放站设备供应商应对设备进行改进,以满足铁路可靠性和可用性要求;(4)本研究结论可供GSM-R系统工程设计参考。

Research purposes： Currently China GSM - R network in tunnel, cutting and other weak field mainly use analog repeater extending coverage of a base station, base station and analog repeater station coverage scheme, there base set too close to co channel, adjacent channel interference, the switching frequency of much influence quality of service （QoS）, analog repeater cannot solve the muhipath time delay in the same frequency interference and uplink interference noise superimposed, and so on. The digital fiber repeater station extension of GSM - R base station coverage, is one of the ways to solve these problems. How to solve, what disadvantages digital optical fiber repeater has and what problems need be improved, need have special technology research. Research conclusions： （1） Digital repeater has more advantages than the traditional analog repeater. （2） Digital repeater is applied to GSM - R system, which can solve the problems of multipath interference caused by the time delay and uplink interference noise. （ 3 ） The digital repeater should be improved to meet the requirements of railway reliability and availability. （4） The research conclusions can provide reference for the design of GSM - R system engineering.