Method and apparatus for timing recovery in ADSL...

Details Method and apparatus for timing recovery in ADSL... Method and apparatus for timing recovery in ADSL...

2006-06-06

2006-06-06

Tran, Khai (Department: 2637)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

37

Reexamination Certificate

active

07058152

ABSTRACT:
A system used to synchronize the clock frequency of a receiver with that of a transmitter, where both the receiver and transmitter communicate using the ADSL Annex C standard. The transmitter continuously transmits pilot tones to the receiver. The receiver determines the phase error between sequential pilot tone symbols to determine a phase error. The receiver uses the phase error to adjust the receiver clock frequency. However, if the most recently received symbol is subject to near end crosstalk or is subject to far end crosstalk and is a boundary symbol, the receiver ignores the phase error and does not adjust the receiver clock frequency.

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