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

H - Electricity

04

L

340/205

H04L 7/02 (2006.01) H04L 7/033 (2006.01)

Patent

CA 1327639

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 neighboring 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.

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