Digital communications receiver that includes a timing recovery

Details Digital communications receiver that includes a timing recovery Digital communications receiver that includes a timing recovery

1996-06-10

1999-01-19

Bocure, Tesfaldet

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375340, H04L 700

Patent

active

058621911

ABSTRACT:
A receiver for use in a synchronous digital communication system wherein transmitted digital signal samples are modulated in accordance with a first constellation of modulated signal values. The receiver includes a phase locked loop for synchronizing digital sampling at the receiver with the received signal samples. The synchronism adjustment error is formed from a pseudo-error function which is a weighted combination of first and second errors, the first error being a function of the distance between received samples and the decisions made with respect thereto in the first constellation, the second error being a function of the distance between received samples and the decisions made with respect thereto in a second simplified constellation derived from the first constellation. A weighting is assigned to the second error which may, in one embodiment, be proportional to the first error.

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"Timing Recovery in Digital Synchronous Data Receivers", by K.H. Mueller et al, IEEE Transactions on Communications, vol. COM-24, No. 5, May 1976, pp. 516-531.
"Blind Equalizers", by a A. Benveniste et al, IEEE Transactions on Communications, vol. COM-32, No. 8, Aug. 1984, pp. 871-883.

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