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arXiv 2108.13609cs.ITmath.COmath.IT
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具有覆盖半径$R$和余维数$tR+1$的覆盖码的长度函数的上界

Upper bounds on the length function for covering codes with covering radius $R$ and codimension $tR+1$

Alexander A. Davydov, Stefano Marcugini, Fernanda Pambianco

摘要:

长度函数$\ell_q(r,R)$是具有余维(冗余)$r$和覆盖半径$R$的$ q $元线性码的最小长度。在这项工作中,新的上界$\ell_q(tR+1,R)$得到以下形式:\begin{equation*} \begin{split} &(a)~\ell_q(r,R)\le cq^{(r-R)/R}\cdot\sqrt[R]{\ln q},~ R\ge3,~r=tR+1,~t\ge1, &\phantom{(a)~} q\text{ is an arbitrary prime power},~c\text{ is independent of }q. \end{split} \end{equation*} \begin{equation*} \begin{split} &(b)~\ell_q(r,R)< 3.43Rq^{(r-R)/R}\cdot\sqrt[R]{\ln q},~ R\ge3,~r=tR+1,~t\ge1, &\phantom{(b)~} q\text{ is an arbitrary prime power},~q\text{ is large enough}. \end{split} \end{equation*}在文献中,对于$q=(q')^R$与$q'$一个素数的权力,较小的上界是已知的,但是,当$q$是一个任意的素数的权力,本文的界限是优于已知的。对于$t=1$,我们在射影空间$\mathrm{PG}(R,q)$中使用$[n,n-(R+1)]_qR$码和$(R-1)$饱和$n$ -集之间的一一对应。提出了一种新的结构,这样的饱和集提供集的小尺寸。然后,以几何方法得到的$[n,n-(R+1)]_qR$码为起始码,进行覆盖码的提升构造(所谓的“$q^m$ -连接构造”),得到余维增长的无限族码$r=tR+1$,$t\ge1$ .

英文摘要:

The length function $\ell_q(r,R)$ is the smallest length of a $ q $-ary linear code with codimension (redundancy) $r$ and covering radius $R$. In this work, new upper bounds on $\ell_q(tR+1,R)$ are obtained in the following forms: \begin{equation*} \begin{split} &(a)~\ell_q(r,R)\le cq^{(r-R)/R}\cdot\sqrt[R]{\ln q},~ R\ge3,~r=tR+1,~t\ge1, &\phantom{(a)~} q\text{ is an arbitrary prime power},~c\text{ is independent of }q. \end{split} \end{equation*} \begin{equation*} \begin{split} &(b)~\ell_q(r,R)< 3.43Rq^{(r-R)/R}\cdot\sqrt[R]{\ln q},~ R\ge3,~r=tR+1,~t\ge1, &\phantom{(b)~} q\text{ is an arbitrary prime power},~q\text{ is large enough}. \end{split} \end{equation*} In the literature, for $q=(q')^R$ with $q'$ a prime power, smaller upper bounds are known; however, when $q$ is an arbitrary prime power, the bounds of this paper are better than the known ones. For $t=1$, we use a one-to-one correspondence between $[n,n-(R+1)]_qR$ codes and $(R-1)$-saturating $n$-sets in the projective space $\mathrm{PG}(R,q)$. A new construction of such saturating sets providing sets of small size is proposed. Then the $[n,n-(R+1)]_qR$ codes, obtained by geometrical methods, are taken as the starting ones in the lift-constructions (so-called "$q^m$-concatenating constructions") for covering codes to obtain infinite families of codes with growing codimension $r=tR+1$, $t\ge1$.

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