Polynomial-time trace reconstruction in the smoothed complexity model
Polynomial-time trace reconstruction in the smoothed complexity model
复制标题
平滑复杂度模型中的多项式时间迹重建
DOI:
10.1137/1.9781611976465.5
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Sinha, Sandip
中科院分区:
文献类型:
--
作者:
Chen, Xi;De, Anindya;Lee, Chin Ho;Servedio, Rocco A.;Sinha, Sandip
In thetrace reconstruction problem, an unknown source stringx∈ {0, 1}nis sent through a probabilisticdeletion channelwhich independently deletes each bit with probabilityδand concatenates the surviving bits, yielding atraceofx. The problem is to reconstructxgiven independent traces. This problem has received much attention in recent years both in the worst-case setting wherexmay be an arbitrary string in {0, 1}n[DOS19, NP17, HHP18, HL20, Cha21a, Cha21b] and in the average-case setting wherexis drawn uniformly at random from {0, 1}n[PZ17, HPP18, HL20, Cha21a, Cha21b].This paper studies trace reconstruction in thesmoothed analysissetting, in which a “worst-case” stringxworstis chosen arbitrarily from {0, 1}n, and then a perturbed version x ofxworstis formed by independently replacing each coordinate by a uniform random bit with probabilityσ. The problem is to reconstruct x given independent traces from it.Our main result is an algorithm which, for any constant perturbation rate 0 <σ< 1 and any constant deletion rate 0 <δ< 1, uses poly(n) running time and traces and succeeds with high probability in reconstructing the string x. This stands in contrast with the worst-case version of the problem, for whichis the best known time and sample complexity [Cha21b].Our approach is based on reconstructing x from the multiset of its short subwords and is quite different from previous algorithms for either the worst-case or average-case versions of the problem. The heart of our work is a new poly(n)-time procedure for reconstructing the multiset of allO(logn)-length subwords of any source stringx∈ {0, 1}ngiven access to traces ofx.
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DOI:
--
发表时间:
2017
期刊:
IEEE Annual Symposium on Foundations of Computer Science
影响因子:
--
作者:
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通讯作者:
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DOI:
10.1007/978-3-662-44777-2_57
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期刊:
Annales de l'Institut Henri Poincaré, Probabilités et Statistiques
影响因子:
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影响因子:
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影响因子:
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DOI:
10.1214/19-aap1506
发表时间:
2020
期刊:
The Annals of Applied Probability
影响因子:
--
作者:
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通讯作者:
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