Frequency control method and circuit employing both reference sy

Details Frequency control method and circuit employing both reference sy Frequency control method and circuit employing both reference sy

1997-10-07

2000-03-28

Vo, Don N.

Pulse or digital communications

Receivers

Automatic frequency control

455255, H04L 2706

Patent

active

060441194

ABSTRACT:
The frequency of a local oscillator is controlled by demodulating a received signal to obtain received symbol values, determining the data value represented by each received symbol value, removing the data values from the received symbol values, and calculating a frequency adjustment from the remaining values. The received signal has reference symbols with known values interspersed among information symbols. The data values of information symbols are determined by a hard-decision process. Received symbol values are preferably obtained for multiple paths, the frequency adjustment being calculated by combining results for different paths.

REFERENCES:
patent: 4575723 (1986-03-01), Turner et al.
patent: 5619524 (1997-04-01), Ling et al.
"A Study on Automatic Frequency Control for Spread Spectrum Mobile Radio Communication", Technical Report of the Institute Electronics, Information, and Communication Engineers of Japan, RCS96-105, Nov. 1996, pp. 45-50.
Digital Mobile Telecommunication, pp. 64-65, published on Feb. 25, 1988 by Kabushiki Kaisha Nihon Kogyo Gijutsu Center.

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