Related Problems of Coverage and Interference Coexistence in Rail Transit Communication System

In recent years, China's urbanization scale process and urban rail transit line planning and development are obvious to all. However, there are still serious problems such as urban congestion and lack of carrying capacity of urban vehicles, which are also important factors hindering the development of urban transportation. The development of urban rail transit can not only open up the situation of urban ground transportation, but also create favorable conditions for the three-dimensional development of the city and provide efficient guarantee for the modernization of the city and the comprehensive coverage of the transportation network. Coverage is the area where signals can be received. Interference means that two or more signals attempt to be received at the same time, so they cannot be received. The results of coverage and interference will vary depending on the location of the receiver, but in general, if there are no obstacles between the transmitter and the receiver, all areas within a certain radius (e.g. 30 miles) should have good coverage. If there are obstacles, such as hills or buildings.