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arXiv 1608.08381cs.ITmath.COmath.IT
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关于给定字长序列的唯一可解码集

On the set of uniquely decodable codes with a given sequence of code word lengths

Adam Woryna

摘要:

对于每个自然数$n\geq 2$和每个自然数的有限序列$L$,我们考虑在一个$n$字母表上所有唯一可解码码的集合$UD_n(L)$,序列$L$作为码字长的序列,以及它的子集$PR_n(L)$和$FD_n(L)$,分别由前缀码和有限延迟码组成。我们推导出估计的商$|UD_n(L)|/|PR_n(L)|$,它允许表征那些序列$L$的等式$PR_n(L)=UD_n(L)$持有。我们还刻画了等式$FD_n(L)=UD_n(L)$成立的那些序列$L$。

英文摘要:

For every natural number $n\geq 2$ and every finite sequence $L$ of natural numbers, we consider the set $UD_n(L)$ of all uniquely decodable codes over an $n$-letter alphabet with the sequence $L$ as the sequence of code word lengths, as well as its subsets $PR_n(L)$ and $FD_n(L)$ consisting of, respectively, the prefix codes and the codes with finite delay. We derive the estimation for the quotient $|UD_n(L)|/|PR_n(L)|$, which allows to characterize those sequences $L$ for which the equality $PR_n(L)=UD_n(L)$ holds. We also characterize those sequences $L$ for which the equality $FD_n(L)=UD_n(L)$ holds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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