Partial response maximum likelihood (PRML) detection trellis method adaptable to signal dropouts
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United States of America Patent
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Sep 28, 2004
Grant Date -
Aug 29, 2002
app pub date -
Dec 20, 2000
filing date -
Dec 20, 2000
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Abstract
An adaptive trellis adaptable to read a signal having signal amplitude dropouts includes a standard partial response maximum likelihood (PRML) trellis and an estimating PRML trellisd. The standard trellis is associated with a standard state diagram having standard branches between states. The estimating trellis is associated with an estimating state diagram having estimating branches between states. Each branch has an associated error metric. Each state of the standard state diagram has two estimating branches feeding into that state and each state of the estimating state diagram has two standard branches feeding into that state. The states are connected by paths formed by branches between the states. A path error metric is the sum of all branch error metrics for all of the branches that form the path. The path arriving at one state having the lowest error metric is the expected path to the next state for reading the signal.
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