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List Decoding from Erasures: Bounds and Code Constructions

机译:列出擦除解码:界限和代码结构

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摘要

We consider the problem of list decoding from erasures. We establish lower and upper bounds on the rate of a (linear) code that can be list decoded with list size L when up to a fraction p of its symbols are adversarially erased. Our results show that in the limit of large L, the rate of such a code approaches the capacity (1-p) of the erasure channel. Such nicely list decodable codes are then used as inner codes in a suitable concatenation scheme to give a uniformly constructive family of asymptotically good binary linear codes of rate Ω(ε{sup}2/lg(1/ε)) that can be efficiently list decoded using lists of size O(1/ε) from up to a fraction (1-ε) of erasures. This improves previous results from [14] in this vein, which achieved a rate of Ω(ε{sup}3lg(1/ε)).
机译:我们考虑从擦除中列出列表解码的问题。我们在可以列出的(线性)代码的速率上建立下限和上限,当其符号的级别P达到达到的分数P时,可以列出用列表尺寸L解码。我们的结果表明,在LIGL的L限制,这种代码的速率接近擦除通道的容量(1-P)。然后,如此恰当地列出可解码代码作为合适的级联方案中的内部代码,以提供可以有效列出的速率ω(ε{sup} 2 / lg(1 /ε))的均匀建设性的渐近良好二进制线性码。使用尺寸O(1 /ε)列表解码,从擦除的一分(1-ε)。这改善了该静脉中的[14]的先前结果,其实现了ω(ε{sup} 3lg(1 /ε))的速率。

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