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arXiv 1108.3571cs.ITmath.IT
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带噪声反馈和峰值能量约束的高斯信道

Gaussian Channel with Noisy Feedback and Peak Energy Constraint

Yu Xiang, Young-Han Kim

摘要:

研究了正交加性高斯白噪声信道中存在噪声反馈时,峰值能量约束下的加性高斯白噪声信道最优编码问题。如Pinsker所示,在峰值能量约束下,在无噪声反馈的情况下传送M元消息(M >= 3)的最佳误差指数严格大于没有反馈的情况。本文推广了Pinsker的结果,证明了当反馈链路中的噪声功率足够小时,通信M元消息的最佳误差指数可以严格大于无反馈时的最佳误差指数。证明涉及两个反馈编码方案。一个是由Burnashev和Yamamoto的二进制对称信道的两阶段噪声反馈编码方案激发的,而另一个是扩展Pinsker的无噪声反馈编码方案的线性噪声反馈编码方案。当反馈噪声功率$α$足够小时,线性编码方案优于两级(非线性)编码方案,并且当$α$趋于零时是渐近最优的。相比之下,当$α$相对较大时,两阶段编码方案执行得更好。

英文摘要:

Optimal coding over the additive white Gaussian noise channel under the peak energy constraint is studied when there is noisy feedback over an orthogonal additive white Gaussian noise channel. As shown by Pinsker, under the peak energy constraint, the best error exponent for communicating an M-ary message, M >= 3, with noise-free feedback is strictly larger than the one without feedback. This paper extends Pinsker's result and shows that if the noise power in the feedback link is sufficiently small, the best error exponent for conmmunicating an M-ary message can be strictly larger than the one without feedback. The proof involves two feedback coding schemes. One is motivated by a two-stage noisy feedback coding scheme of Burnashev and Yamamoto for binary symmetric channels, while the other is a linear noisy feedback coding scheme that extends Pinsker's noise-free feedback coding scheme. When the feedback noise power $α$ is sufficiently small, the linear coding scheme outperforms the two-stage (nonlinear) coding scheme, and is asymptotically optimal as $α$ tends to zero. By contrast, when $α$ is relatively larger, the two-stage coding scheme performs better.

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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