Method and apparatus for reduced-state Viterbi detection in a read channel of a magnetic recording system
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United States of America Patent
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Issued Date -
Dec 1, 2005
app pub date -
May 25, 2004
filing date -
May 25, 2004
priority date (Note) -
Abandoned
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Abstract
A method and apparatus are disclosed for improving the maximum data rate of reduced-state Viterbi detectors with local feedback in magnetic recording systems. A read channel signal is processed in a magnetic recording device by precomputing branch metrics, intersymbol interference estimates or intersymbol interference-free signal estimates for speculative sequences of one or more channel symbols; selecting one of the precomputed values based on at least one decision from at least one corresponding state; and selecting a path having a best path metric for a given state.
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