Frequency assisted digital timing recovery

Details Frequency assisted digital timing recovery Frequency assisted digital timing recovery

2006-05-23

2006-05-23

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

C375S371000

Reexamination Certificate

active

07050521

ABSTRACT:
A method and system is provided for acquisition of the initial timing for a digital phase lock loop timing recovery system. A modified loop filter and post filter allows for an instantaneously change the oscillation frequency of a controllable oscillator and an instantaneous relative change of the sampling phase of the sampled data. These two features are used for initial timing recovery, in which the process of frequency and phase acquisition is separated into two independent steps. Once the initial timing is acquired, the timing recovery system is operated as a conventional digital phase lock loop timing recovery system to track additional frequency and phase drifts at the receiver with respect to the transmitter.

REFERENCES:
patent: 5113116 (1992-05-01), Wilson
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patent: 5691974 (1997-11-01), Zehavi et al.
patent: 5901180 (1999-05-01), Aslanis et al.
patent: 6389062 (2002-05-01), Wu
patent: 6674707 (2004-01-01), Ogura et al.
patent: 6765931 (2004-07-01), Rabenko et al.

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