The Design Of Base Station For The Wireless Dispatch System Of Metro

As the modern city is growing quickly, people have more eager for comfortable,quick,and lower pollution traffic.The city railway play an important role at the modern city traffic system. The special mobile communication system is the important part of city railway system. The special mobile communication system made in German was adopted at I line of ShangHai subway. In order to assure the accord of function and operation, an equipment that can compatible with original system for the extended I line is necessary. First, in this paper, the original system is disserted thoroughly, including the constitute of equipment, structure network and signaling protocol. Base on the research, the paper brings up the general scheme, and clarifies the new system form design index, function, constitute, manager and protocol, etc.Second, for the important node of the system----Base Station(BS), design and realization scheme is put forward. There are two aspects of work, one is how the electric wave to transmission, the other is the realization of control unit. In the former, after given the essential property of the wave transmission in channel, wave transmission in limited space and the selection of microwave leakage coaxial cable are studied in detail , because of the particularity of subway location. Then, the minimum output power is calculated. In the later, the design of software and hardware of BS control unit is achieved. The control unit is the center of the BS node, which take charge wireless resource, parameter and management all kinds of interface. On the design of hardware, the circuit is credibility, simple and variability. At the same time it can support the software very well. On the design of software, it not only accomplish the basis task, but also append the function of long-distance control and check-up by itself to enhance the system capability.