MULTICARRIER RADIO COMMUNICATION SYSTEM

PURPOSE:To eliminate a burst interference in the same zone and to minimize a burst control by spacing plural frequencies used in the same zone and arranging in the spaces frequencies where the directivities of antennas in a master station never overlap. CONSTITUTION:Four 90 deg. zones comprise a circular zone. Four frequencies, A1-A4, for instance, communicating in the 90 deg. zone, have 2 DELTAf2 or more frequency gaps, and never interfere with each other in their zone. Signals B1-B3 are arranged in the gaps of the signals A1-A4. zones A and B are exclusive, and the directivity of the antenna in the master station prevents the interference between the signals A1-A+4 and the signals B1-B4. Similarly communication is attainable in zones C and D without interference. Contiditions to need the burst control, that is, the conditions for adjacent frequencies and adjacent zones, limit to one set of signals B4-C1, and can be minimized.