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Problemy Peredachi Informatsii, 2005, Volume 41, Issue 2, Pages 50–62
(Mi ppi95)
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This article is cited in 4 scientific papers (total in 4 papers)
Coding Theory
Representation of $\mathbb Z_4$-Linear Preparata Codes by Means of Vector Fields
N. N. Tokareva Novosibirsk State University
Abstract:
A binary code is called $\mathbb Z_4$-linear if its quaternary Gray map preimage is linear.
We show that the set of all quaternary linear Preparata codes of length
$n=2^m$,
$m$ odd, $m\ge3$,
is nothing more than the set of codes of the form
$\mathcal H_{\lambda,\psi}+\mathcal M$ with
$$
\mathcal H_{\lambda,\psi}=\{y+T_\lambda(y)+S_\psi(y)\mid y\in H^n\},\qquad
\mathcal M=2H^n,
$$
where $T_\lambda(\,\cdot\,)$ and $S_\psi(\,\cdot\,)$
are vector fields of a special form defined over the binary extended linear
Hamming code $H^n$ of length $n$. An upper bound on the number of nonequivalent quaternary
linear Preparata codes of length $n$ is obtained, namely, $2^{n\log_2n}$. A representation for binary
Preparata codes contained in perfect Vasil'ev codes is suggested.
Received: 08.12.2004 Revised: 14.03.2005
Citation:
N. N. Tokareva, “Representation of $\mathbb Z_4$-Linear Preparata Codes by Means of Vector Fields”, Probl. Peredachi Inf., 41:2 (2005), 50–62; Problems Inform. Transmission, 41:2 (2005), 113–124
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