Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Patent
1992-01-08
1995-02-21
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
455 132, 455 134, 455 17, 3701041, 342352, H04B 7185
Patent
active
053924509
ABSTRACT:
A multiple channel demand assignment multiple access (DAMA) system is configured as a spoke-and-hub star network in which a satellite relays information between each of many small-aperture terminals (SATs), which may be portable terminals (PTs), and a hub network control terminal (NCT) which receives requests from the PTs, allocates channel resources, and broadcasts housekeeping messages. The system has a reservation protocol using at least three separate data channels to take advantage of the inherent lack of adequate radiated power at the PTs: a NCT outbound channel is tightly packed with data, without guard spaces, and it uses typically 98% of the allocated power; separate return channels for data and reservations use little satellite power, with no need for extremely tight data packing. Guard spaces are included in the reservation channel to overcome the total range of propagation delay uncertainty without requiring knowledge of the location of a particular PT.
REFERENCES:
NORSAT Signalling Methods by Bjon Sandnes 1977.
COMSAT Technical Review, vol. 18, No. 1, 1988, Washington, D.C. pp. 21-53.
IEEE Globecom 1989, vol. 2, No. 21, Nov. 1989, Dallas, Tex. pp. 738-749.
IEEE Communication Magazine, vol. 26, No. 5, May 1988, New York, N.Y. pp. 34-44.
"A Man-Portable X-Band Terminal System" H. Goldberg, W. F. Sullivan, D. H. L. Yin-1989 IEEE.
Eisenzopf Reinhard J.
Faile Andrew
General Electric Company
Krauss Geoffrey H.
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