Compensation of frequency offset

Details Compensation of frequency offset Compensation of frequency offset

1994-06-30

1997-03-18

Faile, Andrew

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

455 671, 455 70, 342358, 342418, H04B 7185

Patent

active

056131933

ABSTRACT:
In a satellite mobile communication system in which at least one mobile earth station communicates with a land earth station which is coupled with a network, through a satellite, the land earth station measures frequency offset in a request signal and/or a response signal in a received signal from the mobile earth station due to frequency offset by a transponder in the satellite and/or a local oscillator of said mobile earth station, and doppler shift due to movement of the satellite. The measured frequency offset is forwarded to the mobile earth station through a singalling channel or a communication channel through a satellite. The mobile earth station compensates frequency offset by adjusting oscillation frequency of a local oscillator in the mobile station based upon the measured frequency offset sent from the land earth station.

REFERENCES:
"Frequency Control of Narrowband Digital Carriers in the Presence of Satellite Doppler and Other Disturbances", Foster et al, Proceedings I.cndot.C.cndot.D.cndot.S.cndot.D.cndot.9, May 1992, pp. 213-220.

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