Beta–Beta Bounds: Finite-Blocklength Analog of the Golden Formula
Beta–Beta Bounds: Finite-Blocklength Analog of the Golden Formula
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Beta-Beta 界:黄金公式的有限块长度模拟
DOI:
10.1109/tit.2018.2837104
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发表时间:
2018
影响因子:
2.5
通讯作者:
Poor, H. Vincent
中科院分区:
文献类型:
--
作者:
Yang, Wei;Collins, Austin;Durisi, Giuseppe;Polyanskiy, Yury;Poor, H. Vincent
It is well known that the mutual information between two random variables can be expressed as the difference of two relative entropies that depend on an auxiliary distribution, a relation sometimes referred to as the golden formula. This paper is concerned with a finite-blocklength extension of this relation. This extension consists of two elements: 1) a finiteblocklength channel-coding converse bound by Polyanskiy and Verdú, which involves the ratio of two Neyman-Pearson β functions (beta-beta converse bound); and 2) a novel beta-beta channel-coding achievability bound, expressed again as the ratio of two Neyman-Pearson β functions. To demonstrate the usefulness of this finite-blocklength extension of the golden formula, the beta-beta achievability and converse bounds are used to obtain a finite-blocklength extension of Verdú's wideband-slope approximation. The proof parallels the derivation of the latter, with the beta-beta bounds used in place of the golden formula. The beta-beta (achievability) bound is also shown to be useful in cases where the capacity-achieving output distribution is not a product distribution due to, e.g., a cost constraint or structural constraints on the codebook, such as orthogonality or constant composition. As an example, the bound is used to characterize the channel dispersion of the additive exponential-noise channel and to obtain a finite-blocklength achievability bound (the tightest to date) for multiple-input multiple-output Rayleigh-fading channels with perfect channel state information at the receiver.
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DOI:
--
发表时间:
2012
期刊:
Allerton Conference on Communication, Control, and Computing
影响因子:
--
作者:
Yury Polyanskiy
通讯作者:
Yury Polyanskiy
影响因子:
2.5
作者:
VERDU, S;HAN, TS
通讯作者:
HAN, TS
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
S. Verdú
通讯作者:
S. Verdú
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
Wei Yang
通讯作者:
Wei Yang
DOI:
--
发表时间:
2011
期刊:
2011 IEEE Information Theory Workshop
影响因子:
--
作者:
Thomas J. Riedl;T. Coleman;A. Singer
通讯作者:
A. Singer