Timing recovery system using bipolar-pattern center estimator

Details Timing recovery system using bipolar-pattern center estimator Timing recovery system using bipolar-pattern center estimator

1987-10-14

1989-12-19

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 95, 329311, H04L 25493

Patent

active

048887900

ABSTRACT:
The present invention provides a timing recovery technique for baseband-coded data sequences which applies to line codes with inband timing information embedded in periodic signal transitions, such as zero-crossings. The technique utilizes a selection of data patterns, like mark-to-mark, which have zero-crossings at the "center" of a transition from a positive to negative mark. These so-called "bipolar patterns" consist of two polar-signals of opposite polarity sharing neighborly baud intervals. Because the random nature of a data sequence gives timing information a statistical behavior, a timing recovery system recovers a timing average, the efficiency of the system being given in terms of the timing variance. According to the present invention, a low variance estimate for the bipolar-pattern-center timing signal is obtained by proper filtering.

REFERENCES:
patent: 4635277 (1987-01-01), Blake et al.

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