f_2 + uf_2上基于短Kharaghani阵的68长极值二元self-dual码
New extremal binary self-dual codes of length 68 via short kharaghani array over f_2 + uf_2
摘要：
本文给出了自对偶码的新构造方法。该方法使用了短Kharaghani阵列及其一种变体，适用于任何交换弗罗贝尼乌斯环。我们将这些构造应用于环F_2 + uF_2和自对偶I型[64，32，12]_2-码上，并得到了它们的各种权计数子作为Gray象。利用自对偶码的扩张定理，我们构造了27个新的长度为68的极值二元自对偶码。具有这些权元的极值二元自对偶码的存在性以前是未知的。
英文摘要：
In this work, new construction methods for self-dual codes are given. The methods use the short Kharaghani array and a variation of it. These are applicable to any commutative Frobenius ring. We apply the constructions over the ring F_2 + uF_2 and self-dual Type I [64, 32, 12]_2-codes with various weight enumerators obtained as Gray images. By the use of an extension theorem for self-dual codes we were able to construct 27 new extremal binary self-dual codes of length 68. The existence of the extremal binary self-dual codes with these weight enumerators was previously unknown.
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