Sampled amplitude read channel employing a trellis sequence detector and a post processor for generating error metrics used to correct errors made by the trellis sequence detector
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United States of America Patent
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Jan 28, 2003
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N/A
app pub date -
May 7, 1999
filing date -
May 7, 1999
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Abstract
In a sampled amplitude read channel for disk storage systems, a post processor is employed to correct errors in a preliminary sequence caused by the dominant error events of a trellis sequence detector. By correlating a sample error sequence with the dominant error events, error filters compute a Euclidean distance error metric between the samples sequence selected by the trellis sequence detector and the sample sequence that would have been selected if an error event did not occur. The minimum error metric is assigned to the symbols in the preliminary sequence that differ from the symbol sequence that would have been generated if the error event did not occur. After processing a predetermined number of the symbols in the preliminary sequence, the error metrics assigned, to the symbols are used to detect and correct error events in the preliminary sequence.
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