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arXiv 0909.4203cs.ITmath.IT
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有源噪声反馈高斯信道的误差指数

Error Exponents for the Gaussian Channel with Active Noisy Feedback

Young-Han Kim, Amos Lapidoth, Tsachy Weissman

摘要:

我们研究了最好的指数衰减的错误的概率,可以实现在高斯信道的传输中的一个单一的位与一个活跃的噪声高斯反馈链路的块长度。我们施加一个\emph{expected}块功率约束的前向链路和研究\emph{almost-sure}和\emph{expected}块功率约束的反馈链路。在这两种情况下,最佳可实现的误差指数是有限的,并且与前向链路和反馈链路上的信噪比之间的较大者近似成比例地增长。在几乎确定块功率约束下的误差指数通常严格小于在预期约束下的误差指数。一些结果扩展到通信在任意速率低于容量和一般离散无记忆信道。

英文摘要:

We study the best exponential decay in the blocklength of the probability of error that can be achieved in the transmission of a single bit over the Gaussian channel with an active noisy Gaussian feedback link. We impose an \emph{expected} block power constraint on the forward link and study both \emph{almost-sure} and \emph{expected} block power constraints on the feedback link. In both cases the best achievable error exponents are finite and grow approximately proportionally to the larger between the signal-to-noise ratios on the forward and feedback links. The error exponents under almost-sure block power constraints are typically strictly smaller than under expected constraints. Some of the results extend to communication at arbitrary rates below capacity and to general discrete memoryless channels.

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