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Numerical Issues Affecting LDPC Error Floors

Numerical issues related to the occurrence of error floors in floating-point simulations of belief propagation (BP) decoders are examined. Careful processing of messages corresponding to highly-certain bit values can sometimes reduce error floors by several orders of magnitude. Computational solutions for properly handling such messages are provided for the sum-product algorithm (SPA) and several variants.

preprint2012arXivOpen access
Brian K. ButlerPaul H. Siegel
math.ITInformation Theorymath.NANumerical Analysis
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Open access2 authors4 topics
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Brian K. ButlerPaul H. Siegel

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