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arXiv 2202.09933cs.ITmath.IT
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有记忆状态通道反馈误差指数的上界

Upper Bounds on the Feedback Error Exponent of Channels With States and Memory

Mohsen Heidari, Achilleas Anastasopoulos, S. Sandeep Pradhan

摘要:

马尔可夫信道作为一类状态相关信道,其反馈容量和差错指数的刻画一直是信息论的研究热点。本文研究了一个更一般的变种,这样的渠道,通过一般的随机过程,不一定马尔可夫或遍历的状态演变。假设发射机和接收机的状态是未知的,但潜在的概率分布是已知的。对于这种设置,我们得出的反馈误差指数和反馈容量与可变长度的代码上界。用有向互信息和有向相对熵表示了边界。误差指数的界被简化为离散无记忆通道的Burnashev表达式。我们的方法依赖于从鞅理论的工具来分析一个随机过程定义的熵的消息给定过去的通道的输出的基础上。

英文摘要:

As a class of state-dependent channels, Markov channels have been long studied in information theory for characterizing the feedback capacity and error exponent. This paper studies a more general variant of such channels where the state evolves via a general stochastic process, not necessarily Markov or ergodic. The states are assumed to be unknown to the transmitter and the receiver, but the underlying probability distributions are known. For this setup, we derive an upper bound on the feedback error exponent and the feedback capacity with variable-length codes. The bounds are expressed in terms of the directed mutual information and directed relative entropy. The bounds on the error exponent are simplified to Burnashev's expression for discrete memoryless channels. Our method relies on tools from the theory of martingales to analyze a stochastic process defined based on the entropy of the message given the past channel's outputs.

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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