# American Institute of Mathematical Sciences

May  2013, 7(2): 219-229. doi: 10.3934/amc.2013.7.219

## New extremal binary self-dual codes of length $68$ from $R_2$-lifts of binary self-dual codes

 1 Department of Mathematics, Fatih University, 34500, Istanbul

Received  January 2013 Published  May 2013

A lift of binary self-dual codes to the ring $R_2$ is described. By using this lift, a family of self-dual codes over $R_2$ of length $17$ are constructed. Taking the binary images of these codes, extremal binary self-dual codes of length $68$ are obtained. For the first time in the literature, extremal binary codes of length $68$ with $\gamma=4$ and $\gamma = 6$ in $W_{68,2}$ have been obtained. In addition to these, six new codes with $\gamma = 0$ and fourteen new codes with $\gamma = 2$ in $W_{68,2}$ have also been found.
Citation: Suat Karadeniz, Bahattin Yildiz. New extremal binary self-dual codes of length $68$ from $R_2$-lifts of binary self-dual codes. Advances in Mathematics of Communications, 2013, 7 (2) : 219-229. doi: 10.3934/amc.2013.7.219
##### References:
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##### References:
 [1] W. Bosma, J. Cannon and C. Playoust, The Magma algebra system. I. The user language,, J. Symbolic Comput., 24 (1997), 235. doi: 10.1006/jsco.1996.0125. Google Scholar [2] S. Bouyuklieva, Some Optimal self-orthogonal and self-dual codes,, J. Discrete Math., 287 (2004), 1. doi: 10.1016/j.disc.2004.06.010. Google Scholar [3] S. Bouyuklieva and I. Boukliev, Extremal self-dual codes with an automorphism of order 2,, IEEE Trans. Inform. Theory, 44 (1998), 323. doi: 10.1109/18.651059. Google Scholar [4] S. Bouyuklieva, N. Yankov and J.-L. Kim, Classification of binary self-dual [48,24,10]-codes with an automorphism odd prime order,, Finite Fields Appl., 18 (2012), 1104. doi: 10.1016/j.ffa.2012.08.002. Google Scholar [5] J. H. Conway and N. J. A. Sloane, A new upper bound on the minimal distance of self-dual codes,, IEEE Trans. Inform. Theory, 36 (1990), 1319. doi: 10.1109/18.59931. Google Scholar [6] S. T. Dougherty, A. Gulliver and M. Harada, Extremal binary self-dual codes,, IEEE Trans. Infrom. Theory, 43 (1997), 2036. doi: 10.1109/18.641574. Google Scholar [7] S. T. Dougherty, J.-L. Kim, H. Kulosman and H. Liu, Self-dual codes over commutative Frobenius rings,, Finite Fields Appl., 16 (2010), 4. doi: 10.1016/j.ffa.2009.11.003. Google Scholar [8] S. T. Dougherty, J.-L. Kim and H. Liu, Constructions of self-dual codes over finite commutative chain rings,, J. Inform. Coding Theory, 1 (2010), 171. doi: 10.1504/IJICOT.2010.032133. Google Scholar [9] S. T. Dougherty, B. Yildiz and S. Karadeniz, Codes over $R_k$, Gray maps and their binary images,, Finite Fields Appl., 17 (2011), 205. doi: 10.1016/j.ffa.2010.11.002. Google Scholar [10] S. T. Dougherty, B. Yildiz and S. Karadeniz, Self-dual codes over $R_k$ and binary self-dual codes,, European J. Pure Appl. Math., 6 (2013), 89. Google Scholar [11] P. Gaborit and A. Otmani, Experimental constructions of self-dual codes,, Finite Fields Appl., 9 (2003), 372. doi: 10.1016/S1071-5797(03)00011-X. Google Scholar [12] S. Karadeniz and B. Yildiz, $R_2$-generator matrices for extremal self-dual codes of length 68,, available online at \url{http://www.fatih.edu.tr/~akaya/NewSelf-dual68.pdf}, (). Google Scholar [13] S. Karadeniz and B. Yildiz, Double-circulant and double-bordered-circulant constructions for self-dual codes over $R_2$,, Adv. Math. Commun., 6 (2012), 193. doi: 10.3934/amc.2012.6.193. Google Scholar [14] S. Karadeniz and B. Yildiz, New extremal binary self-dual codes of length $64$ as $R_3$-lifts of the extended binary Hamming code,, submitted., (). Google Scholar [15] H. H. Kim, H. Lee, J. B. Lee and Y. Lee, Construction of self-dual codes with an automorpihsm of of order $p$,, Adv. Math. Commun., 5 (2011), 23. doi: 10.3934/amc.2011.5.23. Google Scholar [16] A. Munemasa, Database of self-dual codes,, available online at \url{http://www.math.is.tohoku.ac.jp/~munemasa/research/codes/data/2/18.magma}, (). Google Scholar [17] T. Nishimura, A new extremal self-dual code of length 64,, IEEE Trans. Inform. Theory, 50 (2004), 2173. doi: 10.1109/TIT.2004.833359. Google Scholar [18] E. M. Rains, Shadow bounds for self dual codes,, IEEE Trans. Inform. Theory, 44 (1998), 134. doi: 10.1109/18.651000. Google Scholar [19] H. P. Tsai, P. Y. Shih, R. Y. Wuh, W. K. Su and C. H. Chen, Construction of self-dual codes,, IEEE Trans. Inform. Theory, 54 (2008), 3826. doi: 10.1109/TIT.2008.926454. Google Scholar [20] J. Wood, Duality for modules over finite rings and applications to coding theory,, Amer. J. Math., 121 (1999), 555. doi: 10.1353/ajm.1999.0024. Google Scholar [21] B. Yildiz and S. Karadeniz, Linear codes over $\mathbb F_2+u\mathbb F_2+v\mathbb F_2+uv\mathbb F_2$,, Des. Codes Crypt., 54 (2010), 61. doi: 10.1007/s10623-009-9309-8. Google Scholar [22] B. Yildiz and S. Karadeniz, Self-dual codes over $\mathbb F_2+u\mathbb F_2+v\mathbb F_2+uv\mathbb F_2$,, J. Franklin Inst., 347 (2010), 1888. doi: 10.1016/j.jfranklin.2010.10.007. Google Scholar
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