Multiplex communications – Wide area network – Packet switching
Patent
1986-08-14
1989-04-18
Cangialosi, Salvatore
Multiplex communications
Wide area network
Packet switching
455 12, H04J 110, H04B 719
Patent
active
048233412
ABSTRACT:
A satellite communications employs separate subsystems for providing broadcast and point-to-point two-way communications using the same assigned frequency band. The broadcast and point-to-point subsystems employ an integrated satellite antenna system which uses a common reflector (12). The point-to-point subsystem achieves increased communication capacity through the reuse of the assigned frequency band over multiple, contiguous zones (32, 34, 36, 38) covering the area of the earth to be serviced. Small aperture terminals in the zones are serviced by a plurality of high gain downlink fan beams (29) steered in the east-west direction by frequency address. A special beam-forming network (98) provides in conjunction with an array antenna (20) the multiple zone frequency address function. The satellite (10) employs a filter interconnection matrix (90) for connecting earth terminals in different zones in a manner which permits multiple reuse of the entire band of assigned frequencies. A single pool of solid state transmitters allows rain disadvantaged users to be assigned higher than normal power at minimum cost. The intermodulation products of the transmitters are geographically dispersed.
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Before the F.C.C., Application of Hughes Com. Mod. Sat. Ser. Inc. for Land Mob. Sat. Syst. 4/30/85.
Cangialosi Salvatore
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
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