Method for Iteratively Decoding Block Codes and Decoding Device Therefor
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United States of America Patent
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Issued Date -
Feb 21, 2008
app pub date -
Jun 6, 2005
filing date -
Jun 10, 2004
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Abandoned
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Abstract
Each received word is subjected to SISO turbodecoding consisting in generating decoded test words using an iterative algorithm, calculating the analog weight of the decoded test word, which weight is the half-sum of the products of the value of each bit mapped to .+-.1 of this decoded test word and the log-likelihood of this bit, classifying the analog weight values of the concurrent words according to a first analog weight vector and a second analog weight vector formed by the analog weight components of the decoded test words, the bit of rank j of which is at a first value, and a second analog weight vector formed by the analog weight components of the decoded test words, the bit of rank j of which is at a second value, and calculating the SISO decoding soft-decision output value as being the difference between the analog weight components of the first and second vectors.
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