几种函数参数化的少权线性码的子域码及其结果
Subfield Codes of Several Few-Weight Linear Codes Parametrized by Functions and Their Consequences
摘要：
有限域上线性码的子域码近年来受到广泛关注。其中一些码是最优的，在秘密共享、认证码和关联方案中有应用。本文分别考虑和研究了有限域$F_{q^m}$上六类由两个函数$f, g$参数化的线性码$C_{f,g}$的$q$ -元子域码$C_{f,g}^{(q)}$.明确地确定了$C_{f,g}^{(q)}$及其删余码$\bar{C}_{f,g}^{(q)}$的参数和汉明重量分布。并对这些码的误码性能参数进行了分析。所得到的$q$元码$C_{f,g}^{(q)},$ $\bar{C}_{f,g}^{(q)}$及其对偶码中有些是最优的，有些具有最好的已知参数.确定了前两类线性码$C_{f,g}$的参数和重量计数器，其中第一类是满足Griesmer界的最优双重量线性码，这两类码的对偶码几乎都是MDS码.作为本文的一个副产品，利用$m \geq 2$得到了一族$[2^{4m-2},2m+1,2^{4m-3}]$四元厄米特自对偶码。作为一个应用，我们证明了三个家庭的衍生线性码产生几个无限家庭的$t$ -设计（$t \in \{2, 3\}$）。
英文摘要：
Subfield codes of linear codes over finite fields have recently received much attention. Some of these codes are optimal and have applications in secrete sharing, authentication codes and association schemes. In this paper, the $q$-ary subfield codes $C_{f,g}^{(q)}$ of six different families of linear codes $C_{f,g}$ parametrized by two functions $f, g$ over a finite field $F_{q^m}$ are considered and studied, respectively. The parameters and (Hamming) weight distribution of $C_{f,g}^{(q)}$ and their punctured codes $\bar{C}_{f,g}^{(q)}$ are explicitly determined. The parameters of the duals of these codes are also analyzed. Some of the resultant $q$-ary codes $C_{f,g}^{(q)},$ $\bar{C}_{f,g}^{(q)}$ and their dual codes are optimal and some have the best known parameters. The parameters and weight enumerators of the first two families of linear codes $C_{f,g}$ are also settled, among which the first family is an optimal two-weight linear code meeting the Griesmer bound, and the dual codes of these two families are almost MDS codes. As a byproduct of this paper, a family of $[2^{4m-2},2m+1,2^{4m-3}]$ quaternary Hermitian self-dual code are obtained with $m \geq 2$. As an application, we show that three families of the derived linear codes give rise to several infinite families of $t$-designs ($t \in \{2, 3\}$).
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