Timing recovery arrangement

Details Timing recovery arrangement Timing recovery arrangement

1996-12-31

1999-02-09

Bochure, Tesfaldet

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375373, H04L 2706

Patent

active

058704426

ABSTRACT:
Timing recovery circuits, automatic gain control circuits and the like, employ a so-called vector tracking filter (VTF) in conjunction with other timing recovery techniques. The VTF includes a complex filter with a time constant so long that it might be considered a leaky integrator. In operation, the VTF builds up an average vector (timing (gain estimate vector) having a direction that is the average of the estimated timing (gain) error, which is stored in the VTF. When an arbitrary timing (gain) correction is made, to the incoming signal, this causes a rotation of the timing (gain) estimate vector. In order to track this rotation, a comparable rotation is made to the stored timing (gain) estimate vector. This allows the stored timing (gain) estimate vector to build up, and at any time the stored timing (gain) estimate vector will be the same as if the current incoming phase had been constant for all previous time. Consequently, it is possible to use a very long time constant in the VTF for long-term steady timing (gain) and at the same time acquire timing (gain) fast. In one example, the length of the vector stored in the VTF is allowed to build up until it reaches the mean value of the incoming timing (gain) estimate.

REFERENCES:
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patent: 5115452 (1992-05-01), Cupo
patent: 5278865 (1994-01-01), Amrany et al.
patent: 5285482 (1994-02-01), Sehier et al.
patent: 5524126 (1996-06-01), Clewer et al.
patent: 5528634 (1996-06-01), Griph et al.
patent: 5724396 (1998-03-01), Claydon et al.

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