Calculation of radio energy of Wi-fi signal in the railway coach

Abstract

Introduction. Access to the Internet through mobile networks 3G, compared with other systems, has considerably lower cost of the implementation, and the best speed characteristics that makes its use more efficient. Modern Wi-Fi router has multiple USB ports that enable to connect the additional 3G modems directly to them. The main part. For the organization of the wireless Internet access in the railway transport it is necessary to use Wi-Fi network in the rail coach. Users will connect to this network. To install the equipment we calculate radio energy of the channel. The level of Wi-Fi signal power increases by using several antennas spaced on the rail coach. The optimal distance between the outer antennas for standard rail coaches is 7 meters. In this case the minimum level of power in the free space is -35 dB. The operation of any user’s devices will be stable with such a high signal level. The calculations take into account the effect of the iron walls of the rail coaches, interference and loss RF cable. Conclusions. Calculation power of Wi-Fi signal is performed in a railway coach.