Message-passing and forced convergence decoding method
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United States of America Patent
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Jun 18, 2013
Grant Date -
Aug 14, 2008
app pub date -
Feb 11, 2008
filing date -
Feb 13, 2007
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Abstract
The invention relates to an iterative decoding method of the message-passing type for decoding an error correcting code susceptible of representation by a bipartite graph including a plurality of variable nodes and a plurality of control nodes, said messages being expressed in terms of a log likelihood ratio. At each iteration of a plurality of decoding iterations, for each pair consisting of a variable node and a control node, a change is detected in the sign of the extrinsic information intended to be transmitted (αmntemp) as a message by said variable node to said control node relative to that transmitted (αmn) at the previous iteration, and in the event of a sign change, said extrinsic information is subjected to an amplitude reduction operation (Fred) before it is transmitted to the control node.
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