Synchronizing continuous bit stream oriented terminals in a comm

Details Synchronizing continuous bit stream oriented terminals in a comm Synchronizing continuous bit stream oriented terminals in a comm

1989-04-21

1991-06-18

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

370941, 3701001, H04L 700

Patent

active

050254570

ABSTRACT:
The frequency of a clock for a receiving terminal is controlled based on a predetermined clock frequency of a terminal that produces a continuous stream of data at a predetermined frequency for transmission to the receiving terminal over a communications network of the kind in which data is transmitted between the terminals in discrete packets that are delayed on the network by possibly different amounts. Arrivals of packets that are sent to the receiving terminal are detected, time intervals between the arrivals of the successive packets are determined, and the time intervals are processed to generate an estimate that is related to the predetermined frequency. The frequency of the receiving terminal clock is controlled in response to the estimate. In one aspect, the time intervals are determined by measuring time differences of arrival between successive packets, and the measured time differences are filtered to generate the estimate. In another aspect, the time intervals are determined by measuring phase differences between a reference signal (that indicates the arrival of each packet) and the receiving terminal clock, and the measured phase differences are filtered to generate the estimate.

REFERENCES:
patent: 4672482 (1987-06-01), Troletti
patent: 4752837 (1988-06-01), DeLand, Jr.
patent: 4872073 (1989-10-01), Fincher et al.
DePrycker et al., "Terminal Synchronization in Asynchronous Networks", Proc. of 1987 International Conference on Communications, Jun. 1987, Seattle, Wash., pp. 800-807.
Montgomery, "Techniques for Packet Voice Synchronization", IEEE Journal on Selected Areas in Communications, vol. Sac-1, No. 6, Dec. 1983, p. 1022.
Cochennec et al., "Asychronous Time-Division Networks: Terminal Synchronization for Video and Audio Signals," Proc. 1985 Global Telecommunications Conference (Globecom), Dec. 1985, New Orleans, La., pp. 791-794.
DePrycker et al., "Performance of a Service Independent Switching Network with Distributed Control", IEEE Journal on Selected Areas in Communications, vol. Sac-5, No. 8, Oct. 1987, p. 1293.

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