基于改进的四循环码构造的新的极值二元自对偶码
New extremal binary self-dual codes from a modified four circulant construction
摘要：
本文利用λ-循环矩阵和λ-逆循环矩阵的性质，提出了一种改进的自对偶码的四循环构造法和一种加边构造法。利用$F_2$上的构造，我们得到了长度为64和68的新的二元码.我们还将这些构造应用到环$R_2$上，并考虑$F_2$和$R_1$ -扩张，得到了长度为66和68的新的单偶极值二元自对偶码.更准确地说，我们发现了3个长度为64的新代码，15个长度为66的新代码和22个长度为68的新代码。这些代码都有权重枚举的参数，不知道存在于文献中。
英文摘要：
In this work, we propose a modified four circulant construction for self-dual codes and a bordered version of the construction using the properties of λ-circulant and λ-reverse circulant matrices. By using the constructions on $F_2$, we obtain new binary codes of lengths 64 and 68. We also apply the constructions to the ring $R_2$ and considering the $F_2$ and $R_1$-extensions, we obtain new singly-even extremal binary self-dual codes of lengths 66 and 68. More precisely, we find 3 new codes of length 64, 15 new codes of length 66 and 22 new codes of length 68. These codes all have weight enumerators with parameters that were not known to exist in the literature.
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