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Channel Coding Rate in the Finite Blocklength Regime

机译:有限块长体制中的信道编码率

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This paper investigates the maximal channel coding rate achievable at a given blocklength and error probability. For general classes of channels new achievability and converse bounds are given, which are tighter than existing bounds for wide ranges of parameters of interest, and lead to tight approximations of the maximal achievable rate for blocklengths $n$ as short as 100. It is also shown analytically that the maximal rate achievable with error probability $epsilon $ is closely approximated by $C - sqrt {{ V}over { n}} ,Q^{-1} (epsilon ) $ where $C$ is the capacity, $V$ is a characteristic of the channel referred to as channel dispersion, and $Q$ is the complementary Gaussian cumulative distribution function.
机译:本文研究了在给定的块长和错误概率下可获得的最大信道编码率。对于一般类别的信道,给出了新的可实现性和逆向边界,对于广泛的目标参数而言,它们比现有的边界更严格,并且导致对于短至100的块长度$ n $的最大可实现速率的严格近似。分析表明,误差概率为$ epsilon $时可达到的最大速率与$ C-sqrt {{V} over {n}},Q ^ {-1}(epsilon)$非常接近,其中$ C $是容量,$ V $是信道的特征,称为信道分散,$ Q $是互补的高斯累积分布函数。

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