Digital communications system comprising a receiver that include

Details Digital communications system comprising a receiver that include Digital communications system comprising a receiver that include

1998-08-11

2000-04-11

Pham, Chi H.

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375340, H04L 700

Patent

active

060495758

ABSTRACT:
A digital communication system including a transmitter and a receiver and 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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