arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.11412cs.ITeess.SPmath.IT
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用于二维的磁记录的非二进制约束码

Non-Binary Constrained Codes for Two-Dimensional Magnetic Recording

Beyza Dabak, Ahmed Hareedy, Robert Calderbank

摘要:

二维的【形】磁记录(TDMR)技术承诺每平方英寸$10$太比特的存储密度。然而,当轨道被挤压在一起时,存储在二维的【形】(TD)网格中的比特遭受来自同一轨道中的相邻比特的符号间干扰(ISI),以及来自相邻轨道中的附近比特的轨道间干扰(ITI)。如果一个位被隔离在一个$3 \times3$正方形的中间,并被它的补码(水平和垂直方向)包围,那么它很可能被错误地读取。我们提高了TDMR系统的可靠性,通过设计二维的【形】约束代码,防止这些平方隔离模式。我们利用TD读头的工作方式来设计我们的代码,我们专注于TD读头,从三个相邻的轨道收集信号。我们表示的二维的【形】平方隔离约束作为一个一维约束的八个非二进制符号的字母表。我们使用这种新的表示法来构造一个非二进制的字典序约束代码,其中三分之一的信息位是不受约束的。我们的TD约束码是实现容量的,并且以小于$3\%$的冗余度和适度的复杂度实现数据保护。

英文摘要:

The two-dimensional magnetic recording (TDMR) technology promises storage densities of $10$ terabits per square inch. However, when tracks are squeezed together, a bit stored in the two-dimensional (TD) grid suffers inter-symbol interference (ISI) from adjacent bits in the same track, and inter-track interference (ITI) from nearby bits in the adjacent tracks. A bit is highly likely to be read incorrectly if it is isolated in the middle of a $3 \times3$ square; surrounded by its complements, horizontally and vertically. We improve the reliability of TDMR systems by designing two-dimensional constrained codes that prevent these square isolation patterns. We exploit the way TD read heads operate to design our codes, and we focus on TD read heads that collect signals from three adjacent tracks. We represent the two-dimensional square isolation constraint as a one-dimensional constraint on an alphabet of eight non-binary symbols. We use this new representation to construct a non-binary lexicographically-ordered constrained code where one third of the information bits are unconstrained. Our TD constraint codes are capacity-achieving, and the data protection is achieved with redundancy less than $3\%$ and at modest complexity.

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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