IMPROVED WIFI COMMUNICATION SYSTEM FOR THE EXCHANGE OF DATA BETWEEN A RAILWAY VEHICLE AND A GROUND TERMINAL

This system comprises a mobile unit, onboard a vehicle, exchanging signals in a current channel, and an infrastructure comprising: several access pointsemitting beacons for establishing a communication link, on a current channel, between said access point and a mobile unit; an interference detection device for detecting interferences and identifying the unusable channels; and a frequency management deviceed in that, for each access point, the frequency management devicegenerates an association table, which associates with each virtual channel of a plurality of virtual channels, a current channel of an access point situated in the neighbourhood of the access point considered, and transmits the association table to the access point considered in that each access point includes a means for generating beacons comprising the association table; and in that the mobile unit extracts, from a beacon received, the association table for updating an onboard association table, used when searching for a channel on which to