Abstract
We say that an s-subset of codewords of a code X is (s, l)-bad if X contains l other codewords such that the conjunction of these l words is covered by the disjunction of the words of the s-subset. Otherwise, an s-subset of codewords of X is said to be (s, l)-bad. A binary code X is called a disjunctive (s, l) cover-free (CF) code if X does not contain (s, l)-bad subsets. We consider a probabilistic generalization of (s, l) CF codes: we say that a binary code is an (s, l) almost cover-free (ACF) code if almost all s-subsets of its codewords are (s, l)-good. The most interesting result is the proof of a lower and an upper bound for the capacity of (s, l) ACF codes; the ratio of these bounds tends as s→∞ to the limit value log2 e/(le).
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Original Russian Text cN.A. Polyansky, 2016, published in Problemy Peredachi Informatsii, 2016, Vol. 52, No. 2, pp. 46–60.
The research was carried out at the Institute for Information Transmission Problems of the Russian Academy of Sciences at the expense of the Russian Science Foundation, project no. 14-50-00150.
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Polyansky, N.A. Almost cover-free codes. Probl Inf Transm 52, 142–155 (2016). https://doi.org/10.1134/S0032946016020046
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DOI: https://doi.org/10.1134/S0032946016020046