Abstract
We develop refinements of the Levenshtein bound in q-ary Hamming spaces by taking into account the discrete nature of the distances versus the continuous behavior of certain parameters used by Levenshtein. We investigate the first relevant cases and present new bounds. In particular, we derive generalizations and q-ary analogs of the MacEliece bound. Furthermore, we provide evidence that our approach is as good as the complete linear programming and discuss how faster are our calculations. Finally, we present a table with parameters of codes which, if exist, would attain our bounds.
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Dedicated to the memory of Prof. V.I. Levenshtein (1935–2017)
Original Russian Text © P. Boyvalenkov, D. Danev, M. Stoyanova, 2018, published in Problemy Peredachi Informatsii, 2018, Vol. 54, No. 4, pp. 35–50.
Supported in part by the Bulgarian NSF, contract DN02/2-13.12.2016.
Supported in part by the Swedish Research Council (VR) and ELLIIT.
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Boyvalenkov, P., Danev, D. & Stoyanova, M. Refinements of Levenshtein Bounds in q-ary Hamming Spaces. Probl Inf Transm 54, 329–342 (2018). https://doi.org/10.1134/S0032946018040026
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DOI: https://doi.org/10.1134/S0032946018040026