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

机译:从二进制自对码的R_2-提升起长度为68的新的极值二进制自对码

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摘要

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 γ = 4 and γ = 6 in W_(68,2) have been obtained. In addition to these, six new codes with γ = 0 and fourteen new codes with γ = 2 in W_(68,2) have also been found.
机译:描述了二进制自对偶码到环R_2的提升。通过使用该升降机,构造了长度为R_2的长度为R_2的一系列自对偶代码。拍摄这些代码的二进制图像,获得长度为68的极值二进制自对偶代码。在文献中首次获得了长度为68的极值二进制代码,其中W_(68,2)中的γ= 4和γ= 6。除此以外,还在W_(68,2)中找到了6个γ= 0的新代码和14个γ= 2的新代码。

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