Method for synchronizing the reference frequency oscillator of a

Details Method for synchronizing the reference frequency oscillator of a Method for synchronizing the reference frequency oscillator of a

1993-10-15

1995-11-21

Tse, Young

Pulse or digital communications

Synchronizers

Feedback, receiver to transmitter

375354, 375356, 455 512, 455 69, H04L 700, H04B 700

Patent

active

054694671

ABSTRACT:
The present invention involves a device for synchronizing the broadcast frequency of a base station and a microcell linked together by a metallic medium as well as a method for using the device to synchronize the base oscillator and the microcell oscillator. The device comprises a base transmitter which transmits a base time-of-day signal to a microcell comparer, and a microcell clock which sends a microcell time-of-day signal to the microcell comparer. A microcell oscillator provides the microcell clock with a reference frequency. The microcell comparer calculates a time difference which represents a time difference between the base time-of-day signal and the microcell time-of-day signal. The microcell comparer then outputs a correction signal to a digital controller. The digital controller adjusts a microcell oscillator according to the correction signal.

REFERENCES:
patent: 4800560 (1989-01-01), Aoki et al.
patent: 5257404 (1993-10-01), Goreham et al.
patent: 5261118 (1993-11-01), Vanderspool, II et al.
patent: 5280629 (1994-01-01), Lo Galbo et al.
patent: 5363376 (1994-11-01), Chuang et al.
J. Levine, et al., "The NIST Automated Computer Time Service", Journal of Research of the National Institute of Standards and Technology, (Sep.-Oct. 1989), vol. 94, No. 5, pp. 311-321.
W. D. Grover and T. E. Moore, Precision Time-Transfer in Transport Networks Using Digital Crossconnect Systems, IEEE Global Telecommunications Conference & Exhibition, Nov. 28-Dec. 1, 1988.

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