arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.05582cs.ITmath.IT
收藏

两个删除信道下最大似然译码的错误概率

The Error Probability of Maximum-Likelihood Decoding over Two Deletion Channels

Omer Sabary, Eitan Yaakobi, Alexander Yucovich

摘要:

本文研究的问题,重建一个字的几个噪音副本。这种设置的动机是几个应用程序,其中包括在基于DNA的存储系统中重建链。在这种模式下,一个字是通过一些固定数量的相同的独立通道传输,解码器的目标是输出传输的字或一些近似值。本文的主要重点是两个删除通道的情况下,并研究在这种设置下的最大似然(ML)解码器的错误概率。首先,讨论ML解码器如何操作。然后,我们观察到,占主导地位的错误模式是删除在同一运行或错误导致的交替序列。基于这些观察,推导出ML解码器的错误概率大致为$\frac{3q-1}{q-1}p^2$,当发送的字是任何$q$-ary序列并且$p$是信道的删除概率时。我们还研究了当传输的字属于Varshamov Tenengolts(VT)码或移位VT码的情况。最后,对插入通道进行了研究。这些理论结果得到了相应的仿真验证。

英文摘要:

This paper studies the problem of reconstructing a word given several of its noisy copies. This setup is motivated by several applications, among them is reconstructing strands in DNA-based storage systems. Under this paradigm, a word is transmitted over some fixed number of identical independent channels and the goal of the decoder is to output the transmitted word or some close approximation. The main focus of this paper is the case of two deletion channels and studying the error probability of the maximum-likelihood (ML) decoder under this setup. First, it is discussed how the ML decoder operates. Then, we observe that the dominant error patterns are deletions in the same run or errors resulting from alternating sequences. Based on these observations, it is derived that the error probability of the ML decoder is roughly $\frac{3q-1}{q-1}p^2$, when the transmitted word is any $q$-ary sequence and $p$ is the channel's deletion probability. We also study the cases when the transmitted word belongs to the Varshamov Tenengolts (VT) code or the shifted VT code. Lastly, the insertion channel is studied as well. These theoretical results are verified by corresponding simulations.

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。

↑