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arXiv 2006.00344cs.ITmath.IT
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AWGN信道的可支持容量逼近分布

Finite-Support Capacity-Approaching Distributions for AWGN Channels

Derek Xiao, Linfang Wang, Richard D. Wesel

摘要:

在本文中,动态分配Blahut-Arimoto(DAB)算法识别具有小基数的有限支持概率质量函数(PMF),其实现幅度受限(AC)加性高斯白噪声(AWGN)信道的容量,或接近功率受限(PC)AWGN信道的容量小于1%。虽然众所周知连续高斯PDF是PC-AWGN信道的理论容量实现分布,但DAB识别具有小基数的PMF,出于实际目的,在性能上无法区分。我们扩展了Ozarow和Wyner的结果,该结果需要$2^{C+1}$的星座基数来接近容量C到整形损耗内。由DAB发现的PMF接近容量,基本上没有整形损失,星座基数为$2^{C+1.2}$。对于AC-AWGN信道,DAB表征了最小基数有限支持容量实现PMF的演变。

英文摘要:

In this paper, the Dynamic-Assignment Blahut-Arimoto (DAB) algorithm identifies finite-support probability mass functions (PMFs) with small cardinality that achieve capacity for amplitude-constrained (AC) Additive White Gaussian Noise (AWGN) Channels, or approach capacity to within less than 1% for power-constrained (PC) AWGN Channels. While a continuous Gaussian PDF is well-known to be a theoretical capacity-achieving distribution for the PC-AWGN channel, DAB identifies PMFs with small-cardinality that are, for practical purposes, indistinguishable in performance. We extend the results of Ozarow and Wyner that require a constellation cardinality of $2^{C+1}$ to approach capacity C to within the shaping loss. PMF's found by DAB approach capacity with essentially no shaping loss with constellation cardinality of $2^{C+1.2}$. For AC-AWGN channels, DAB characterizes the evolution of minimum-cardinality finite-support capacity-achieving PMFs.

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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