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August  2009, 3(3): 251-263. doi: 10.3934/amc.2009.3.251

Construction of new self-dual codes over $GF(5)$ using skew-Hadamard matrices

Christos Koukouvinos 1, and  Dimitris E. Simos 1,

1. 

Department of Mathematics, National Technical University of Athens, Zografou 15773, Athens, Greece, Greece

Received  February 2009 Revised  May 2009 Published  August 2009

In this paper, we give optimal self-dual codes over $GF(5)$ for lengths $24$, $40$, $48$ and $56$. In particular, new inequivalent $[48, 24]$ and $[56, 28]$ self-dual codes over $GF(5)$ whose minimum weights are $14$ and $16$, are constructed using skew-Hadamard matrices of order $24$ and $28$, thus improving the only known quadratic double circulant self-dual codes of length $48$ and $56$. Moreover, $[80, 40]$ and $[88, 44]$ self-dual codes whose minimum weights are $17$ and $19$ over $GF(5)$, are constructed for the first time. These codes are derived from skew-Hadamard matrices of order $40$ and $44$, respectively. Finally, a new $[56, 28, 17]$ self-dual code is constructed over $GF(7)$ having the highest minimum weight among $[56, 28]$ self-dual codes. This new optimal code is constructed from a skew-Hadamard-matrix of order $28$, for the first time.
Keywords: Self-dual codes, construction..
Mathematics Subject Classification: Primary: 94B05, 05B20; Secondary: 94B2.
Citation: Christos Koukouvinos, Dimitris E. Simos. Construction of new self-dual codes over $GF(5)$ using skew-Hadamard matrices. Advances in Mathematics of Communications, 2009, 3 (3) : 251-263. doi: 10.3934/amc.2009.3.251
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