包西铁路GSM-R数字光纤直放站方案研究

通过传输损耗、上行噪声叠加、传输时延和组网等方面来比较模拟光纤直放站和数字光纤直放站的优缺点,试验利用数字光纤直放站在既有包西线GSM-R系统中替代模拟光纤直放站进行弱场覆盖,发现数字光纤直放站近、远端机之间的光纤传输链路不受光功率衰减的影响,并能通过调整远端机时延可以良好解决实际应用中多个远端单元RRU之间重叠覆盖区域的时延色散问题,对数字光纤直放站今后在铁路推广应用具有参考价值。

Study on Scheme of GSM-R Digital Optic-Fiber Repeater on Baotou-Xi'an Railway

Through comparison on advantages and disadvantages between the analogue and digital opticfiber repeaters in the aspects of the transmission loss,uplink noise overlapping,transmission delay and networking,the experiment was carried out in which the digital optic-fiber repeater was employed to replace the analogue optic-fiber repeater on the existing Baotou-Xi'an Railway GSM-R system so as to reach the coverage in weak-field area.The experiment shows that the optic transmission link between the MHU and RRU will not be influenced by the attenuation of the optic power,and shows that the problem of delay dispersion in overlapping coverage area among several RRUs can effectively be solved through adjusting the delay of the RRU.This thesis also presents constructive suggestions on the application of the digital optic-fiber repeater in railway.