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Abstract Abstract：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 multipath 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 filler 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.
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Received: 01 January 2016
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2016, Vol. 33 
