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arXiv 2005.08610cs.ITmath.IT
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变长编码的分布式假设检验

Distributed Hypothesis Testing with Variable-Length Coding

Sadaf Salehkalaibar, Michele Wigger

摘要:

当\emph{average}而不是\emph{maximum}的通信负载如在以前的作品中受到约束时,被认为是分布式测试与可变长度编码的独立性的问题。本文给出了在无噪声速率$R$链路和带停止反馈的离散无记忆信道(DMC)上通信时,在最大I类错误概率下,单传感器单决策中心系统的最优II类错误指数的特征。具体地,令$ε$表示最大允许的I类错误概率。然后,在平均通信负载的约束下具有速率- $R$链路的系统的最优指数与在最大通信负载约束下具有速率$R/(1-ε)$链路的这种系统的最优指数一致。因此,在平均通信负载约束下,强逆命题不成立。类似的观察也适用于测试对DMC的独立性。在可变长度编码和停止反馈的情况下,在平均通信负载约束下,当通信在容量为$C(1-ε)^{-1}$的DMC上时,在容量为$C$的DMC上的最佳II类差错指数等于在固定长度编码和最大通信负载约束下的最佳指数。特别地,在具有停止反馈的DMC上的变长编码下,强逆结果不成立,并且最佳误差指数仅通过其容量依赖于DMC的过渡律。

英文摘要:

The problem of distributed testing against independence with variable-length coding is considered when the \emph{average} and not the \emph{maximum} communication load is constrained as in previous works. The paper characterizes the optimum type-II error exponent of a single sensor single decision center system given a maximum type-I error probability when communication is either over a noise-free rate-$R$ link or over a noisy discrete memoryless channel (DMC) with stop-feedback. Specifically, let $ε$ denote the maximum allowed type-I error probability. Then the optimum exponent of the system with a rate-$R$ link under a constraint on the average communication load coincides with the optimum exponent of such a system with a rate $R/(1-ε)$ link under a maximum communication load constraint. A strong converse thus does not hold under an average communication load constraint. A similar observation holds also for testing against independence over DMCs. With variable-length coding and stop-feedback and under an average communication load constraint, the optimum type-II error exponent over a DMC of capacity $C$ equals the optimum exponent under fixed-length coding and a maximum communication load constraint when communication is over a DMC of capacity $C(1-ε)^{-1}$. In particular, under variable-length coding over a DMC with stop feedback a strong converse result does not hold and the optimum error exponent depends on the transition law of the DMC only through its capacity.

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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