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arXiv cs/0410019cs.ITcond-mat.dis-nnmath.IT
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低密度奇偶检验码的码长缩放和码长移位

Finite-Length Scaling and Finite-Length Shift for Low-Density Parity-Check Codes

Abdelaziz Amraoui, Andrea Montanari, Tom Richardson, Rudiger Urbanke

摘要:

考虑在二进制擦除信道BEC上使用随机低密度奇偶检验码的通信,该码具有来自“标准”集合的有限块长度n。我们表明,大的误差事件是方便的尺度理论内描述,并解释如何估计其效果的实证。在其他量中,我们考虑有限长度阈值e(n),其通过要求块错误概率P_B = 1/2来定义。对于具有大于2的最小变量度的系综,以下表达式被论证为保持e(n)= e-e_1 n^{-2/3} +Θ(n^{-1}),其中可计算的移位参数e_1>0。

英文摘要:

Consider communication over the binary erasure channel BEC using random low-density parity-check codes with finite-blocklength n from `standard' ensembles. We show that large error events is conveniently described within a scaling theory, and explain how to estimate heuristically their effect. Among other quantities, we consider the finite length threshold e(n), defined by requiring a block error probability P_B = 1/2. For ensembles with minimum variable degree larger than two, the following expression is argued to hold e(n) = e -e_1 n^{-2/3} +Θ(n^{-1}) with a calculable shift} parameter e_1>0.

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