Mobile satellite communication system

Details Mobile satellite communication system Mobile satellite communication system

1988-09-09

1990-02-13

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

370 70, 370 97, H04J 102, H04J 110

Patent

active

049013106

ABSTRACT:
A satellite communication system includes a plurality of mobile stations which are situated on the earth and a communication satellite which is communicable with the mobile stations by radio signals over a plurality of spot beams. The satellite applies single sideband amplitude modulation (SSB-AM) to analog signals which are sent from the mobile stations, applies digital modulation to coded voice and data, and separates signals in the form of frequency-division-multiplexed (FDM) signals on a channel basis by a transmultiplexer method which is implemented by demultiplexers of a transponder. Baseband matrix means is provided for connecting an output of any of the demultiplexers to one of the spot beams to be transmitted. Further, transmitting means is provided for time-division-multiplexing outputs of the baseband matrix means to form a transmit frame and transmitting it in the form of a TDM signal. On the other hand, each mobile station includes a receiver for selecting a channel signal to be received out of the TDM signal which is sent from the transmitting means of the onboard transponder, and demodulates it to regenerate a signal.

REFERENCES:
patent: 4312062 (1982-01-01), Bellanger et al.
patent: 4381562 (1983-04-01), Acampora
patent: 4425639 (1984-01-01), Acampora et al.
patent: 4456988 (1984-06-01), Nakagome et al.
patent: 4705239 (1987-11-01), Ito et al.

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