Compensation of frequency offset
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United States of America Patent
Stats
-
Mar 18, 1997
Grant Date -
N/A
app pub date -
Jun 30, 1994
filing date -
Jul 5, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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