Method and devices for transmitting data, particularly by satell

Details Method and devices for transmitting data, particularly by satell Method and devices for transmitting data, particularly by satell

1994-01-18

1995-06-27

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 75, 370 76, 370122, 455 23, 455 45, H04B 7185

Patent

active

054286000

ABSTRACT:
A relay satellite receives, from stations on the ground, modulated high-frequency signals situated in two different frequency bands. One of the modulations is narrow band and the other broad band. The satellite retransmits a multiplexed signal resulting from the phase modulation, of a sub-carrier consisting of the signal modulated by the narrow band modulation. The phase modulation is performed using signals drawn from the signals that carry the broad-band modulation. The user stations receive this multiplexed signal and extract therefrom, by filtering, the narrow band modulated sub-carrier, which can be used for phase-demodulating the multiplexed signal in order to recover signals which carry the broad-band modulation.

REFERENCES:
patent: 2654885 (1953-10-01), Wilmotte
patent: 3180938 (1965-04-01), Glomb
patent: 3546386 (1970-12-01), Darcey
patent: 5081703 (1992-01-01), Lee
Global Positioning by Satellite; P. Mattos, Feb. 1989 Electronics & Wireless World, pp. 137-142.
VSAT Technology, Trends, and Applications; A. Rana; Proceedings of the IEEE, vol. 28, No. 7, Jul. 1990, pp. 1087-1095.
Implementation Imperfections of A 4.0.-DCPSK On-Board Demodulator: Performance Degradations and Measurement Techniques; L. Moreno, Zie Voor Titel Boek; de 2e Pagina; pp. 469-476.

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