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arXiv 1705.01596cs.ITmath.IT
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有无反馈和输入代价的突发噪声擦除信道容量

Capacity of Burst Noise-Erasure Channels With and Without Feedback and Input Cost

Lin Song, Fady Alajaji, Tamás Linder

摘要:

研究了一类在传输过程中同时存在差错和擦除的突发噪声擦除信道。的通道,其输出明确表示在其输入和平稳遍历噪声擦除过程中,被证明具有所谓的“准对称性”在一定的可逆性条件下的属性。其结果是,它被证明是一个均匀分布的输入过程最大化的信道的块互信息,导致在一个封闭形式的公式,其无反馈能力的噪声擦除熵率和辅助擦除过程的熵率。反馈信道容量的特点也表明,反馈不增加容量和推广以前的相关结果。还研究了有反馈和无反馈信道的容量成本函数。一个序列的有限字母的上限容量成本函数无反馈。使用特定的编码规则获得具有反馈的容量成本函数的字母较低的键。基于这些界限,它是证明了数字和分析,反馈可以增加容量成本函数的一类信道的马尔可夫噪声擦除过程。

英文摘要:

A class of burst noise-erasure channels which incorporate both errors and erasures during transmission is studied. The channel, whose output is explicitly expressed in terms of its input and a stationary ergodic noise-erasure process, is shown to have a so-called "quasi-symmetry" property under certain invertibility conditions. As a result, it is proved that a uniformly distributed input process maximizes the channel's block mutual information, resulting in a closed-form formula for its non-feedback capacity in terms of the noise-erasure entropy rate and the entropy rate of an auxiliary erasure process. The feedback channel capacity is also characterized, showing that feedback does not increase capacity and generalizing prior related results. The capacity-cost function of the channel with and without feedback is also investigated. A sequence of finite-letter upper bounds for the capacity-cost function without feedback is derived. Finite-letter lower bonds for the capacity-cost function with feedback are obtained using a specific encoding rule. Based on these bounds, it is demonstrated both numerically and analytically that feedback can increase the capacity-cost function for a class of channels with Markov noise-erasure processes.

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