A power-conserving time division multiple access (TDMA) radio telephone system is disclosed in which a cluster of subscriber stations, remote from a base station, employs a common pool of frequency-agile modems each of which digitally synthesizes, on a timeSlot-by-timeSlot basis, the different channel-identifying...http://www.google.fr/patents/US6208630?utm_source=gb-gplus-shareBrevet US6208630 - Modulary clustered radiotelephone system
