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- W1663773594 abstract "We construct an explicit family of linear rank-metric codes over any field Fh that enables efficient list decoding up to a fraction ρ of errors in the rank metric with a rate of 1− ρ− e, for any desired ρ ∈ (0, 1) and e > 0. Previously, a Monte Carlo construction of such codes was known, but this is in fact the first explicit construction of positive rate rank-metric codes for list decoding beyond the unique decoding radius. Our codes are explicit subcodes of the well-known Gabidulin codes, which encode linearized polynomials of low degree via their values at a collection of linearly independent points. The subcode is picked by restricting the message polynomials to an Fh-subspace that evades the structured subspaces over an extension field Fht that arise in the linear-algebraic list decoder for Gabidulin codes due to Guruswami and Xing (STOC’13). This subspace is obtained by combining subspace designs contructed by Guruswami and Kopparty (FOCS’13) with subspace-evasive varieties due to Dvir and Lovett (STOC’12). We establish a similar result for subspace codes, which are a collection of subspaces, every pair of which have low-dimensional intersection, and which have received much attention recently in the context of network coding. We also give explicit subcodes of folded ReedSolomon (RS) codes with small folding order that are list-decodable (in the Hamming metric) with optimal redundancy, motivated by the fact that list decoding RS codes reduces to list decoding such folded RS codes. However, as we only list decode a subcode of these codes, the Johnson radius continues to be the best known error fraction for list decoding RS codes. ∗Research supported in part by NSF CCF-0963975. †guruswami@cmu.edu ‡wangc@cs.cmu.edu ISSN 1433-8092 Electronic Colloquium on Computational Complexity, Report No. 170 (2013)" @default.
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- W1663773594 date "2013-11-27" @default.
- W1663773594 modified "2023-09-26" @default.
- W1663773594 title "Explicit rank-metric codes list-decodable with optimal redundancy" @default.
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