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Hamming distances of constacyclic codes of length 3p~s and optimal codes with respect to the Griesmer and Singleton bounds

机译:长度3p〜s的山顶距离山顶差距和最佳代码相对于Griesmer和Singleton边界

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摘要

Let p not equal 3 be a prime, s, in be positive integers, and A be a nonzero element of the finite field F-pm . In [22] and [20], when the generator polynomials have one or two different irreducible factors, the Hamming distances of lambda-constacyclic codes of length 3ps over F-pm have been considered. In this paper, we obtain that the Hamming distances of the repeated root lambda-constacyclic codes of length lps can be determined by the Hamming distances of the simple-root gamma-constacyclic codes of length l, where l is a positive integer and lambda = gamma(ps). Based on this result, the Hamming distances of the repeated root lambda-constacyclic codes of length 3p(s) are given when the generator polynomials have three different irreducible factors. Hence, the Hamming distances of all such constacyclic codes are determined. As an application, we obtain all optimal lambda-constacyclic codes of length 3p(s) with respect to the Griesmer bound and the Singleton bound. Among others, several examples show that some of our codes have the best known parameters with respect to the code tables in [19]. (C) 2020 Elsevier Inc. All rights reserved.
机译:让P不等于3是素数,S,IN为正整数,是有限字段F-PM的非零元素。在[22]和[20]中,当发电机多项式具有一个或两个不同的不可挽回因子时,已经考虑了在F-PM上的Lambda-Constacyclic码的汉明距离。在本文中,我们获得了长度LP的重复根λ-稳定性码的汉明距离可以通过长度L的简单根伽马 - 陀螺码的汉明距离来确定,其中L是正整数和Lambda =伽玛(PS)。基于该结果,当发电机多项式具有三种不同的不可可变因素时,给出了长度3p的重复根λ-稳定性码的汉明距离。因此,确定所有这些常规码的汉明距离。作为申请,我们在GRIESER绑定和单身绑定的始终获得长度3P的所有最佳LABDA - 稳定性码。其中,有几个例子表明我们的一些代码对于[19]中的代码表具有最佳已知的参数。 (c)2020 Elsevier Inc.保留所有权利。

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