Method and device for loop timing recovery based on maximum...

Details Method and device for loop timing recovery based on maximum... Method and device for loop timing recovery based on maximum...

2005-01-26

2008-08-19

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

C375S340000

Reexamination Certificate

active

07415090

ABSTRACT:
A receiving device of a multiple communications channel system includes: a noise detector that detects channel noise among the received data signals and selects at least one channel among a plurality of channels in the multiple channel communications system on which the received data signals are largely unaffected by noise; a magnitude checker that selects at least one channel among the plurality of channels on which the received data signals have a magnitude greater than a predetermined magnitude among the received data; a QAM unit constellation detector that detects a QAM unit constellation using a reference constellation from a constellation value on a QAM coordinate plane of the selected signal channel; and a constellation rotation unit that rotates and maps the detected QAM unit constellation value onto a Real=Imaginary axis. The receiving device performs a reliable phased locked loop operation by eliminating the effect caused by noise during transmission of the data signals, while retaining phase error information in extracting the timing information from received data signals.

REFERENCES:
patent: 4771438 (1988-09-01), Nash
patent: 5471508 (1995-11-01), Koslov
patent: 6137839 (2000-10-01), Mannering et al.
patent: 6891792 (2005-05-01), Cimini et al.
patent: 2004/0081205 (2004-04-01), Coulson
patent: 99-034147 (1999-05-01), None
patent: WO 99/48219 (1999-09-01), None

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