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arXiv 1902.07979cs.ITmath.IT
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信源-信道编码期望失真的一个下界

A Lower Bound on the Expected Distortion of Joint Source-Channel Coding

Yuval Kochman, Or Ordentlich, Yury Polyanskiy

摘要:

我们考虑经典的联合信源-信道编码问题,即在无记忆信道上传输无记忆信源。这项工作的重点是长期存在的公开问题,找到收敛速度的最小可达到的预期失真的渐近值,作为一个功能的块长度$n$。我们的主要结果是,在一般情况下,收敛速度不快于$n^{-1/2}$。特别是,我们表明,对于问题的传输i.i.d均匀位在一个二进制对称信道与汉明失真,最小可达到的失真(出错率)至少$Ω(n^{-1/2})$以上的渐近值,如果"带宽扩展比“是以上$1$。

英文摘要:

We consider the classic joint source-channel coding problem of transmitting a memoryless source over a memoryless channel. The focus of this work is on the long-standing open problem of finding the rate of convergence of the smallest attainable expected distortion to its asymptotic value, as a function of blocklength $n$. Our main result is that in general the convergence rate is not faster than $n^{-1/2}$. In particular, we show that for the problem of transmitting i.i.d uniform bits over a binary symmetric channels with Hamming distortion, the smallest attainable distortion (bit error rate) is at least $Ω(n^{-1/2})$ above the asymptotic value, if the ``bandwidth expansion ratio'' is above $1$.

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