Abstract
A code is called distance regular, if for every two codewords x, y and integers i, j the number of codewords z such that d(x, z) = i and d(y, z) = j, with d the Hamming distance, does not depend on the choice of x, y and depends only on d(x, y) and i, j. Using some properties of the discrete Fourier transform we give a new combinatorial proof of the distance regularity of an arbitrary Kerdock code. We also calculate the parameters of the distance regularity of a Kerdock code.
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Original Russian Text Copyright © 2008 Solov’eva F. I. and Tokareva N. N.
The first author was partially supported by the Royal Swedish Academy of Sciences. The second author was supported by the Russian Science Support Foundation, the Integration Project of the Siberian Branch of the Russian Academy of Sciences “A Tree-Like Catalog of Internet Mathematical Resources” (Grant No. 35), and the Russian Foundation for Basic Research (Grants 07-01-00248 and 08-01-00671). Both authors were partially supported by Novosibirsk State University.
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Translated from Sibirskiĭ Matematicheskiĭ Zhurnal, Vol. 49, No. 3, pp. 669–682, May–June, 2008.
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Solov’eva, F.I., Tokareva, N.N. Distance regularity of Kerdock codes. Sib Math J 49, 539–548 (2008). https://doi.org/10.1007/s11202-008-0051-7
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DOI: https://doi.org/10.1007/s11202-008-0051-7