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New extremal binary self-dual codes of length 66 as extensions of self-dual codes over Rk

2013; Elsevier BV; Volume: 350; Issue: 8 Linguagem: Inglês

10.1016/j.jfranklin.2013.05.015

1879-2693

Suat Karadeniz, Bahattin Yıldız,

graph theory and CDMA systems

We obtain extremal binary self-dual codes of parameters [64,32,12] as binary images of self-dual codes over R1, R2 and R3 by employing different methods. We then apply the extension theorem to these codes to obtain a number of extremal binary self-dual codes of length 66 with trivial automorphism groups. Fifteen of the codes we obtain have new β values in W66,3, of which only three were known to exist before. We also find nine codes with new β values in W66,1, thus updating the list of such known codes.