E 2 PR4 viterbi detector and method for adding a branch...

Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction

Reexamination Certificate

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C714S796000, C375S262000

Reexamination Certificate

active

10194659

ABSTRACT:
An E2PR4 Viterbi detector receives a signal that represents a sequence of values, the sequence having a potential state. The detector includes a recovery circuit that recovers the sequence from the signal by identifying the surviving path to the potential state and simultaneously adding a modified branch metric to the path metric of the surviving path. By simultaneously identifying the surviving path and adding a modified branch metric to its path metric, such an E2PR4 Viterbi detector can operate faster than a conventional add-compare-select E2PR4 Viterbi detector.

REFERENCES:
patent: 5313495 (1994-05-01), Kim
patent: 5430744 (1995-07-01), Fettweis et al.
patent: 6081210 (2000-06-01), Nikolic et al.
patent: 6201840 (2001-03-01), Rub et al.
patent: 6259749 (2001-07-01), Andoh

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