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arXiv 1012.6012cs.ITmath.IT
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带反馈的离散无记忆广播信道容量

On the Capacity of the Discrete Memoryless Broadcast Channel with Feedback

Ofer Shayevitz, Michele Wigger

摘要:

本文提出了一种离散无记忆广播信道的{无噪声,有噪声,广义}反馈编码方案,并导出了相应的可达域。该方案是基于一个块马尔可夫策略相结合的马顿计划和一个有损版本的格雷-怀纳计划与边信息。在每个块中,发射机发送新的数据和更新信息,允许接收机改善在前一个块中观察到的信道输出。对于Dueck广播信道的推广,我们的方案实现了无噪声反馈容量,这是严格大于无反馈容量。对于Blackwell信道的推广,当反馈是无噪声的,我们的新方案实现的速率点是在无反馈容量区域之外。它遵循一个简单的连续性参数,对于这两个信道,当反馈噪声足够低时,我们的方案提高了无反馈容量,即使当反馈是嘈杂的。

英文摘要:

A coding scheme for the discrete memoryless broadcast channel with {noiseless, noisy, generalized} feedback is proposed, and the associated achievable region derived. The scheme is based on a block-Markov strategy combining the Marton scheme and a lossy version of the Gray-Wyner scheme with side-information. In each block the transmitter sends fresh data and update information that allows the receivers to improve the channel outputs observed in the previous block. For a generalization of Dueck's broadcast channel our scheme achieves the noiseless-feedback capacity, which is strictly larger than the no-feedback capacity. For a generalization of Blackwell's channel and when the feedback is noiseless our new scheme achieves rate points that are outside the no-feedback capacity region. It follows by a simple continuity argument that for both these channels and when the feedback noise is sufficiently low, our scheme improves on the no-feedback capacity even when the feedback is noisy.

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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