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arXiv 2101.06951eess.SP
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大规模多输入多输出系统中基于深度学习的天线选择和CSI外推

Deep Learning based Antenna Selection and CSI Extrapolation in Massive MIMO Systems

Bo Lin, Feifei Gao, Shun Zhang, Ting Zhou, Ahmed Alkhateeb

摘要:

大规模多输入多输出(MIMO)系统的一个关键瓶颈是下行传输所带来的巨大训练开销,如信道估计、下行波束形成和协方差观测。在本文中,我们提出使用少量天线的信道状态信息(CSI)来外推其他天线的CSI,并减少训练开销。具体来说,我们设计了一个深度神经网络,我们称之为天线域外推网络(ADEN),它可以利用天线之间的相关函数。然后,我们提出了一种基于深度学习(DL)的天线选择网络(ASN),可以选择有限的天线来优化外推,这通常是一种组合优化类型,很难解决。我们巧妙地设计了一个约束退化算法来生成离散天线选择向量的可微近似,从而可以保证神经网络的反向传播。数值结果表明,该算法优于传统的全连接算法,并且通过自学习算法学习的天线选择方案比通常使用的均匀选择方案有更好的性能。

英文摘要:

A critical bottleneck of massive multiple-input multiple-output (MIMO) system is the huge training overhead caused by downlink transmission, like channel estimation, downlink beamforming and covariance observation. In this paper, we propose to use the channel state information (CSI) of a small number of antennas to extrapolate the CSI of the other antennas and reduce the training overhead. Specifically, we design a deep neural network that we call an antenna domain extrapolation network (ADEN) that can exploit the correlation function among antennas. We then propose a deep learning (DL) based antenna selection network (ASN) that can select a limited antennas for optimizing the extrapolation, which is conventionally a type of combinatorial optimization and is difficult to solve. We trickly designed a constrained degradation algorithm to generate a differentiable approximation of the discrete antenna selection vector such that the back-propagation of the neural network can be guaranteed. Numerical results show that the proposed ADEN outperforms the traditional fully connected one, and the antenna selection scheme learned by ASN is much better than the trivially used uniform selection.

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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