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US 8,046,670 B1Granted
Method and apparatus for detecting viterbi decoder errors due to quasi-catastrophic sequences
AssigneeMarvell International Ltd.
InventorsMats Oberg, Daniel Mumford
Life of this patent
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Abstract
A Viterbi decoder includes an early decision generator that generates an early decision output. An error detector detects errors in the early decision output and generates a signal when the early decision output errors are detected.
Claims16
A Viterbi decoder comprising:
- early decision generating means for generating an early decision output;
- and
- error detecting means for detecting errors in said early decision output and for generating a signal when said early decision output errors are detected.
A Viterbi decoder comprising:
- early decision generating means for generating an early decision output;
- secondary early decision generating means for generating a secondary early decision output;
- and
- error detecting means for detecting errors in said early decision output and that includes comparing means for generating a signal when said secondary early decision output is different than said early decision output.
1 more element
A Viterbi decoder comprising:
- early decision generating means for generating an early decision output;
- secondary early decision generating means for generating a secondary early decision output;
- flag generating means for generating a best path flag when said Viterbi decoder identifies two best paths having the same path metric;
- and
- error detecting means for detecting errors in said early decision output and that includes comparing means for generating a signal when a prior secondary early decision output is different than said early decision output, said best path flag is true and a prior best path flag is true.
2 more elements
Dependencies are inferred from the claim text.