Hybrid modulation satellite communication system

Details Hybrid modulation satellite communication system Hybrid modulation satellite communication system

1990-04-20

1991-11-19

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

455 13, 455 69, H04B 7005, H04B 7185

Patent

active

050669575

ABSTRACT:
In a satellite communication system including a plural small earth stations (3-8), a relay earth station (2) and a satellite (1), information transmission is undertaken by primary modulation of carrier wave, and transmission of operation status of each small earth station (3-8) is carried out by secondary modulation of said carrier wave. Primary modulation may be BPSK or multiphase PSK (MPSK), and secondary modulation may be PSK, ASK or FSK. Said operation status may be receive signal quality in each small earth station, and the relay earth station (2) may adjust transmit power to said small earth station such that the receive signal quality at small earth stations satisfies desired criteria irrespective of rain attenuation.

REFERENCES:
patent: 3800245 (1974-03-01), Basu
patent: 4228538 (1980-10-01), Scharla-Nielsen et al.
patent: 4418350 (1983-11-01), Rosen
patent: 4426711 (1984-01-01), Huriau
patent: 4455651 (1984-06-01), Baran
patent: 4567485 (1986-01-01), Oshima et al.
patent: 4731866 (1988-03-01), Muratani et al.
patent: 4910792 (1990-03-01), Takahata et al.

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