The present invention relates to a point-to-multipoint or broadcast TDMA or FDMA satellite arrangement wherein each up-link message unit is intended for reception at one or more geographically dispersed remote receiving sites within a wide service area. In one arrangement of a TDMA or FDMA satellite,...http://www.google.com/patents/US4381562?utm_source=gb-gplus-sharePatent US4381562 - Broadcast type satellite communication systems
