Method and apparatus for generating filter tap weights and biases for signal dependent branch metric computation
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United States of America Patent
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Jul 17, 2012
Grant Date -
Nov 10, 2005
app pub date -
May 5, 2004
filing date -
May 5, 2004
priority date (Note) -
Expired
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Abstract
A method and apparatus are provided for determining a plurality of filter tap weights or biases (or both) for a noise predictive filter used to generate one or more signal dependent branch metrics. A filter tap weight or filter bias (or both) are adaptively accumulated for each possible data condition. The data conditions may comprise, for example, each possible data pattern for a given data dependency length. The appropriate accumulated filter tap weight or bias to update can be selected based on a data condition associated with the current received data. The filter tap weights associated with a delay 0 tap can be adapted for each filter condition except for a single normalizing condition, whose corresponding delay 0 tap remains fixed.
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