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arXiv 1503.01955cs.ITmath.IT
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高速扩展码的线性时间表恢复

Linear-time list recovery of high-rate expander codes

Brett Hemenway, Mary Wootters

摘要:

我们表明,扩展代码,当适当的实例化,是高速率的列表可恢复代码与线性时间列表恢复算法。最近,列表可恢复码在构造有效的列表可解码码以及用于压缩感知和组测试的矩阵的显式构造中是有用的。以前的列表可恢复代码与线性时间解码算法都有率最多为1/2,相比之下,我们的代码可以有率$1 - ε$的任何$ε> 0$。我们可以将我们的高速率代码插入Meir(2014)的构造中,以获得任意速率的线性时间列表可恢复代码,其接近所提供的非平凡列表的数量与代码的速率之间的最佳权衡。虽然列表恢复本身很有趣,但我们的主要动机是应用于列表解码。稍微加强我们的结果将意味着线性时间和最佳列表解码码的所有速率,我们的工作是解决这个重要问题的方向迈出了一步。

英文摘要:

We show that expander codes, when properly instantiated, are high-rate list recoverable codes with linear-time list recovery algorithms. List recoverable codes have been useful recently in constructing efficiently list-decodable codes, as well as explicit constructions of matrices for compressive sensing and group testing. Previous list recoverable codes with linear-time decoding algorithms have all had rate at most 1/2; in contrast, our codes can have rate $1 - ε$ for any $ε> 0$. We can plug our high-rate codes into a construction of Meir (2014) to obtain linear-time list recoverable codes of arbitrary rates, which approach the optimal trade-off between the number of non-trivial lists provided and the rate of the code. While list-recovery is interesting on its own, our primary motivation is applications to list-decoding. A slight strengthening of our result would implies linear-time and optimally list-decodable codes for all rates, and our work is a step in the direction of solving this important problem.

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