Transceiver for use in earth station in satellite communications

Details Transceiver for use in earth station in satellite communications Transceiver for use in earth station in satellite communications

1988-10-19

1990-08-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 691, 455 12, 455 32, 455 34, 455184, H04J 112, H04J 116

Patent

active

049512790

ABSTRACT:
In order to compensate for frequency deviation without using a pilot signal and associated apparatus, a channel number identification code is added to a transmit signal at an earth station transmitter. Each channel unit (e.g. demodulator) of a receiving earth station is arranged to extract a channel identification code from a received signal and to compare this with a preset code assigned to that channel. In the event that the recieved channel idenfication code does not coincide with that of the instant channel, the channel determines that number of channels by which deviation which has occured and adjusts its receiving frequency accordingly.

REFERENCES:
patent: 4156197 (1979-05-01), Merrell
patent: 4291414 (1981-09-01), Kimura
patent: 4317225 (1982-02-01), Henderson et al.
patent: 4419769 (1983-12-01), Cohen
patent: 4607257 (1986-08-01), Noguchi
patent: 4783844 (1988-11-01), Higashiyama et al.
patent: 4800561 (1989-01-01), Ishi
patent: 4850030 (1989-07-01), Hasimoto et al.

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