Soft-decision decoding of convolutionally encoded codeword
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United States of America Patent
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Feb 14, 2006
Grant Date -
Sep 13, 2001
app pub date -
Feb 26, 2001
filing date -
Mar 1, 2000
priority date (Note) -
Expired
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Abstract
A method and apparatus for decoding convolutional codes used in error-correcting circuitry for digital data communication. To increase the speed and precision of the decoding process, the branch and/or state metrics are normalized during the soft decision calculations, whereby the dynamic range of the decoder is better utilized. Another aspect of the invention relates to decreasing the time and memory required to calculate the log-likelihood ratio by sending some of the soft decision values directly to a calculator without first storing them in memory.
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