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arXiv 2003.06807cs.ITmath.IT
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关于随机码集合误块概率的近似、有界和精确计算

On Approximation, Bounding & Exact Calculation of Block Error Probability for Random Code Ensembles

Ralf R. Müller

摘要:

本文提出了一种计算某些随机码系综在最大似然译码下的平均误块概率的方法。所提出的方法适用于各种通道和合奏。重点是在加性高斯白噪声信道上的球形和高斯随机码以及在二进制对称信道和二进制擦除信道上的二进制随机码。而对于均匀球系综香农,在1959年,认为立体角在$N$维空间,所提出的方法项目的问题到两个维度,并适用于标准三角。这简化了推导,并且还允许分析独立同分布(i.i.d.)高斯系综,结果是表现更好的短块长度和高速率。此外,还得到了均匀球系综平均误块概率的一个新的下界,对于码字数大于3的码,它比球系综的平均误块概率的下界更紧,但所需的计算量完全相同.此外,紧逼近提出了简化计算的精确平均误差概率和两个界限。对于二进制对称信道和二进制擦除信道,i.i.d.\推导出随机编码并与精确计算进行比较。

英文摘要:

This paper presents a method to calculate the exact average block error probability of some random code ensembles under maximum-likelihood decoding. The proposed method is applicable to various channels and ensembles. The focus is on both spherical and Gaussian random codes on the additive white Gaussian noise channel as well as binary random codes on both the binary symmetric channel and the binary erasure channel. While for the uniform spherical ensemble Shannon, in 1959, argued with solid angles in $N$-dimensional space, the presented approach projects the problem into two dimensions and applies standard trigonometry. This simplifies the derivation and also allows for the analysis of the independent identically distributed (i.i.d.) Gaussian ensemble which turns out to perform better for short blocklengths and high rates. Moreover, a new lower bound on the average block error probability of the uniform spherical ensemble is found. For codes with more than three codewords, it is tighter than the sphere packing bound, but requires exactly the same computing effort. Furthermore, tight approximations are proposed to simplify the computation of both the exact average error probability and the two bounds. For the binary symmetric channel and the binary erasure channel, bounds on the average block error probability for i.i.d.\ random coding are derived and compared to the exact calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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