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arXiv 1801.04439cs.ITmath.IT
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混合信源的变长可分辨性及其在变长信源编码中的应用

Variable-Length Resolvability for Mixed Sources and its Application to Variable-Length Source Coding

Hideki Yagi, Te Sun Han

摘要:

在变长$δ$ -信道可分辨性问题中,信道输出通过在目标分布和近似分布之间的变化距离应渐近地在给定常数$δ$内的约束下对变长均匀随机数进行编码来近似。在本文中,我们假设给定的通道输入是一个混合源,其组件可以是一般的源。为了分析均匀随机数的最小可达长度速率,称为$δ$ -可分辨性,我们引入了可变长度$δ$ -信道可分辨性的变体问题。对于一般信道,建立了该问题的$δ$ -可解性的一般公式.当通道是一个身份映射,它表明,$δ$ -可解性在原来的和变体的问题一致。这种关系导致一个直接推导的单字母公式的$δ$ -resolvability时,给定的源是一个混合的无记忆源。我们将结果推广到二阶情形。作为一个副产品,我们得到了固定到可变长度信源编码的一阶和二阶公式,允许错误概率高达$δ$。

英文摘要:

In the problem of variable-length $δ$-channel resolvability, the channel output is approximated by encoding a variable-length uniform random number under the constraint that the variational distance between the target and approximated distributions should be within a given constant $δ$ asymptotically. In this paper, we assume that the given channel input is a mixed source whose components may be general sources. To analyze the minimum achievable length rate of the uniform random number, called the $δ$-resolvability, we introduce a variant problem of the variable-length $δ$-channel resolvability. A general formula for the $δ$-resolvability in this variant problem is established for a general channel. When the channel is an identity mapping, it is shown that the $δ$-resolvability in the original and variant problems coincide. This relation leads to a direct derivation of a single-letter formula for the $δ$-resolvability when the given source is a mixed memoryless source. We extend the result to the second-order case. As a byproduct, we obtain the first-order and second-order formulas for fixed-to-variable length source coding allowing error probability up to $δ$.

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