Improved decoding of interleaved AG codes

  • Authors:
  • Andrew Brown;Lorenz Minder;Amin Shokrollahi

  • Affiliations:
  • Laboratoire des mathematiques algorithmiques (LMA), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne;Laboratoire des mathematiques algorithmiques (LMA), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne;Laboratoire des mathematiques algorithmiques (LMA), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne

  • Venue:
  • IMA'05 Proceedings of the 10th international conference on Cryptography and Coding
  • Year:
  • 2005

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Abstract

We analyze a generalization of a recent algorithm of Bleichenbacher et al. for decoding interleaved codes on the Q-ary symmetric channel for large Q. We will show that for any m and any ε the new algorithms can decode up to a fraction of at least $\frac{\beta m}{\beta m+1}(1-R-2Q^{-1/2m}) - \epsilon$ errors, where $\beta = \frac{ln(q^m - 1)}{ln(q^m)}$, and that the error probability of the decoder is upper bounded by O(1/qεn), where n is the block-length. The codes we construct do not have a-priori any bound on their length.