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In this work, four circulant and quadratic double circulant (QDC) constructions are applied to the family of the rings $R_{k,m}$. Self-dual binary codes are obtained as the Gray images of self-dual QDC codes over $ R_{k,m}$. Extremal binary self-dual codes of length 64 are obtained as Gray images of $\lambda$-four circulant codes over $R_{2,1}$ and $R_{2,2}$. Extremal binary self-dual codes of lengths 66 and 68 are constructed by applying extension theorems to the $\mathbb{F}_{2}$ and $R_{2,1}$ images of these codes. More precisely, 10 new codes of length 66 and 39 new codes of length 68 are discovered. The codes with these weight enumerators are constructed for the first time in literature. The results are tabulated.
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참고문헌 (21)
참고문헌 신청
A. Kaya / / Binary generator matrices of new extremal self-dual bi-nary codes of lengths 66 and 68
A. Kaya / / New extremal binary self-dual codes from F4 +uF4-lifts of quadratic double circulant codes over F4
A. Kaya / / Various constructions for self-dual codes over rings and new binary self-dual codes
A. Kaya / 2014 / New extremal binary self-dual codes of length 68 / J. Algebra Comb. Discrete Struct. Appl 1 (1) : 29 ~ 39
B. Yıldız / 2010 / Linear codes over F2 + uF2 + vF2 + uvF2 / Des. Codes Cryptogr 54 (1) : 61 ~ 81
A. Kaya / / New extremal binary self-dual codes from F4 +uF4-lifts of quadratic double circulant codes over F4
A. Kaya / / Various constructions for self-dual codes over rings and new binary self-dual codes
A. Kaya / 2014 / New extremal binary self-dual codes of length 68 / J. Algebra Comb. Discrete Struct. Appl 1 (1) : 29 ~ 39
B. Yıldız / 2010 / Linear codes over F2 + uF2 + vF2 + uvF2 / Des. Codes Cryptogr 54 (1) : 61 ~ 81
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