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arXiv 0907.3397math.RAcs.ITmath.IT
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有限链环上码的Gray象

The Gray Image of Codes over Finite Chain Rings

Somphong Jitman, Patanee Udomkavanich

摘要:

J.F. Qann等[4]关于幂零指数为2的有限链环上的$(1-γ)$ -循环码的研究,推广到任意幂零指数为$e+1$的有限链环上的$(1-γ^e)$ -循环码. Gray映射被引入到这类环中。证明了有限链环上线性$(1 - γ^{e})$ -循环码的Gray像是其剩余域上距离不变的拟循环码.当码长与环的特征互素时,线性循环码和线性$(1+γ^e)$ -循环码的Gray像在其剩余域上置换为准循环码.

英文摘要:

The results of J. F. Qiann et al. [4] on $(1-γ)$-cyclic codes over finite chain rings of nilpotency index 2 are extended to $(1-γ^e)$-cyclic codes over finite chain rings of arbitrary nilpotency index $e+1$. The Gray map is introduced for this type of rings. We prove that the Gray image of a linear $(1 - γ^{e})$-cyclic code over a finite chain ring is a distance-invariant quasi-cyclic code over its residue field. When the length of codes and the characteristic of a ring are relatively prime, the Gray images of a linear cyclic code and a linear $(1+γ^e)$-cyclic code are permutatively to quasi-cyclic codes over its residue field.

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