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arXiv 1407.8022cs.ITmath.IT
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带噪声反馈的高斯信道:通过简单交互的近容量性能

The Gaussian Channel with Noisy Feedback: Near-Capacity Performance via Simple Interaction

Assaf Ben-Yishai, Ofer Shayevitz

摘要:

考虑由两个独立加性高斯白噪声通道连接的一对终端,并受到单独功率约束的限制。第一终端希望在给定的错误概率内可靠地向第二终端发送信息。我们构建了一个明确的互动计划,只包括(非线性)标量操作,赋予Schalkwijk-Kailath无噪声反馈计划与模运算。我们的方案实现了通信速率接近香农极限,在一个小的轮数。例如,对于$10^{-6}$的错误概率,如果反馈信道的信噪比($\mathrm{SNR}$)超过前向信道的$\mathrm{SNR}$达$20\mathrm{dB}$,则我们的方案从香农极限开始操作$0.8\mathrm{dB}$,仅具有$19$轮的交互。相比之下,使用现有技术的前向纠错(FEC)码获得相同的性能需要延迟和复杂度增加两个数量级。在另一个极端,具有相同错误概率的最小延迟未编码系统由$9\mathrm{dB}$从香农极限有界。

英文摘要:

Consider a pair of terminals connected by two independent additive white Gaussian noise channels, and limited by individual power constraints. The first terminal would like to reliably send information to the second terminal, within a given error probability. We construct an explicit interactive scheme consisting of only (non-linear) scalar operations, by endowing the Schalkwijk-Kailath noiseless feedback scheme with modulo arithmetic. Our scheme achieves a communication rate close to the Shannon limit, in a small number of rounds. For example, for an error probability of $10^{-6}$, if the Signal to Noise Ratio ($\mathrm{SNR}$) of the feedback channel exceeds the $\mathrm{SNR}$ of the forward channel by $20\mathrm{dB}$, our scheme operates $0.8\mathrm{dB}$ from the Shannon limit with only $19$ rounds of interaction. In comparison, attaining the same performance using state of the art Forward Error Correction (FEC) codes requires two orders of magnitude increase in delay and complexity. On the other extreme, a minimal delay uncoded system with the same error probability is bounded away by $9\mathrm{dB}$ from the Shannon limit.

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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