Abstract
Wachter-Zeh (IEEE Trans Inf Theory 59(11):7268–7276, 2013), and later together with Raviv (IEEE Trans Inf Theory 62(4):1605–1615, 2016), proved that Gabidulin codes cannot be efficiently list decoded for any radius \(\tau \), providing that \(\tau \) is large enough. Also, they proved that there are infinitely many choices of the parameters for which Gabidulin codes cannot be efficiently list decoded at all. Subsequently, in Trombetti and Zullo (IEEE Trans Inf Theory 66(9):5379–5386, 2020) these results have been extended to the family of generalized Gabidulin codes and to further family of MRD-codes. In this paper, we provide bounds on the list size of rank-metric codes containing generalized Gabidulin codes in order to determine whether or not a polynomial-time list decoding algorithm exists. We detect several families of rank-metric codes containing a generalized Gabidulin code as subcode which cannot be efficiently list decoded for any radius large enough and families of rank-metric codes which cannot be efficiently list decoded. These results suggest that rank-metric codes which are \({{\mathbb {F}}}_{q^m}\)-linear or that contains a (power of) generalized Gabidulin code cannot be efficiently list decoded for large values of the radius.
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Notes
Here by \((\mathcal {G}_{m,k,\sigma })^{\sigma ^j}\) we mean the set \(\{f(x)^{\sigma ^j} :f(x) \in \mathcal {G}_{m,k,\sigma } \}\).
\(A^T\) denotes the transpose of A.
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Acknowledgements
We would like the anonymous referee for her/his valuable comments, which improves the quality of this paper. This research was supported by the Italian National Group for Algebraic and Geometric Structures and their Applications (GNSAGA - INdAM). The second author is also supported by the project “VALERE: VAnviteLli pEr la RicErca" of the University of Campania “Luigi Vanvitelli”.
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Santonastaso, P., Zullo, F. On the list decodability of rank-metric codes containing Gabidulin codes. Des. Codes Cryptogr. 90, 957–982 (2022). https://doi.org/10.1007/s10623-022-01022-6
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DOI: https://doi.org/10.1007/s10623-022-01022-6