arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.1644cs.ITmath.IT
收藏

通过删除通道获得的重复数的表征

A characterization of the number of subsequences obtained via the deletion channel

Y. Liron, M. Langberg

摘要:

出于删除通道的研究,这项工作提出了改进的界限上的数量从一个二进制sting的长度为n的t删除下得到的连续性。已知在此设置中的连续性的数量强烈地依赖于串X中的游程的数量;其中游程是相同字符的最大序列。我们的改进的界限得到的r-运行字符串X,分析中,我们确定的极值字符串的数量的连续性的家庭的结构分析。具体来说,对于每一个r,我们目前的r-运行字符串的最小(分别最大)数量下的任意t删除的连续性,并执行这些极值字符串的连续性的数量的精确分析。

英文摘要:

Motivated by the study of deletion channels, this work presents improved bounds on the number of subsequences obtained from a binary sting X of length n under t deletions. It is known that the number of subsequences in this setting strongly depends on the number of runs in the string X; where a run is a maximal sequence of the same character. Our improved bounds are obtained by a structural analysis of the family of r-run strings X, an analysis in which we identify the extremal strings with respect to the number of subsequences. Specifically, for every r, we present r-run strings with the minimum (respectively maximum) number of subsequences under any t deletions; and perform an exact analysis of the number of subsequences of these extremal strings.

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。

↑