RADIO INFORMATION AND COMMUNICATION SYSTEM USING MULTICARRIER SPREAD-SPECTRUM TRANSMISSION SYSTEM.

摘要

When from a radio station of a transmission side, data are sent by a radio transmission, first at least a part of a transmission data string is divided into a plurality of bit strings, and a plurality of carriers whose frequencies are different from each other are modulated primarily by these bit strings. Then, each of the carriers modulated primarily is modulated secondarily by a spread-spectrum system such as a frequency hopping system or a chirp system, and the modulated wave obtained by the secondary modulations is transmitted. <IMAGE>