Processing of state histories in Viterbi decoding
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United States of America Patent
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Oct 1, 2002
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N/A
app pub date -
Jun 1, 1999
filing date -
Jun 1, 1998
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Abstract
A simplified method of history handling for the Viterbi decoding of convolutional codes is described herein. The state number, or one or more of the most-significant bits of the state number, is loaded into the corresponding state history. Each state number represents the sequence of data bits that, in convolutional encoding, would give rise to the corresponding state. The most recent data bit provides the least significant bit of the state number. This invention reduces the processing requirements associated with the handling of the history, and is especially useful for decoder implementations using general-purpose processors.
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