Frequency error correction in a satellite-mobile communications

Details Frequency error correction in a satellite-mobile communications Frequency error correction in a satellite-mobile communications

1994-09-14

1998-04-21

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

455 121, 455575, 455 63, 455427, 342358, H04B 7185

Patent

active

057429081

ABSTRACT:
Mobile stations correct their frequencies using a signal received from the moving relay station including correction of any Doppler shift caused by the satellite's movement. The mobile station includes a receiver for receiving a paging channel signal broadcast by the moving relay station and demodulators and decoders for decoding the information in the paging channel signal. Using the decoded information, the mobile station can determine an estimate of its position within the communication system. The mobile station can also determine a frequency error and a Doppler shift using the decoded information and the position estimate. A frequency controlling signal is determined using the determined frequency error and the Doppler shift. A controlled reference oscillator then uses the frequency correcting signal as a control input signal. Finally, the mobile station contains a transmitter for transmitting a signal using the voltage controlled oscillator as a reference.

REFERENCES:
patent: 5287541 (1994-02-01), Davis et al.
patent: 5313215 (1994-05-01), Walker et al.
patent: 5343512 (1994-08-01), Wang et al.
patent: 5432521 (1995-07-01), Siwiak et al.
patent: 5471648 (1995-11-01), Gourgue
patent: 5552795 (1996-09-01), Tayloe et al.

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