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  • 标题:A new family of locally correctable codes based on degree-lifted algebraic geometry codes
  • 本地全文:下载
  • 作者:Eli Ben-Sasson ; Ariel Gabizon ; Yohay Kaplan
  • 期刊名称:Electronic Colloquium on Computational Complexity
  • 印刷版ISSN:1433-8092
  • 出版年度:2012
  • 卷号:2012
  • 出版社:Universität Trier, Lehrstuhl für Theoretische Computer-Forschung
  • 摘要:

    We describe new constructions of error correcting codes, obtained by "degree-lifting" a short algebraic geometry (AG) base-code of block-length q to a lifted-code of block-length qm, for arbitrary integer m. The construction generalizes the way degree-d, univariate polynomials evaluated over the q-element field (also known as Reed-Solomon codes) are "lifted" to degree-d, m-variate polynomials (Reed-Muller codes). Three properties are established:

    {\bf Rate} The rate of the degree-lifted code is approximately a 1m!-fraction of the rate of the base-code.

    {\bf Distance} The relative distance of the degree-lifted code is at least as large as that of the base-code. This is proved using a generalization of the Schwartz-Zippel Lemma to degree-lifted Algebraic-Geometry codes.

    As a first concrete example, lifting the AG codes of Garcia and Stichtenoth [J. Number Theory `96] results in Reed-Muller-like codes but over constant sized alphabets, such codes are interesting in the search for probabilistically checkable proofs (PCPs) with constant rate and polynomially small query complexity.

    {\bf Local correction} If the base code is invariant under a group that is ``close'' to being doubly-transitive (in a precise manner defined later, then the degree-lifted code is locally correctable with query complexity at most q2. The automorphisms of the base-code are crucially used to generate query-sets, abstracting the use of affine-lines in the local correction procedure of Reed-Muller codes.

    Taking a second concrete example, we show that degree-lifted Hermitian codes form a family of locally correctable codes over an alphabet that is significantly smaller than that obtained by Reed-Muller codes of similar constant rate, message length, and distance.

  • 关键词:algebraic geometry codes; Error Correcting Codes; Locally correctable codes; Locally decodable codes
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