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arXiv 2002.00474eess.SP
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基于深度学习的超大MIMO阵列空间用户映射

Deep Learning Based Spatial User Mapping on Extra Large MIMO Arrays

Abolfazl Amiri, Carles Navarro Manch'on, Elisabeth de Carvalho

摘要:

在超大规模MIMO(XL-MIMO)系统中,天线阵列具有超过传统MIMO系统中的尺寸的大的物理尺寸。由于这种大的维度,当依赖于传统的优化工具时,XL-MIMO系统的优化导致具有令人望而却步的复杂性的解决方案。在本文中,我们提出了一种基于机器学习的设计,用于具有线性预处理的多用户设置的下行链路,其中目标是为每个用户选择有限的映射区域,即包含用户波束成形能量的阵列的一小部分。我们将这种选择称为空间用户映射(SUM)。我们的解决方案依赖于使用深度卷积神经网络进行学习,该网络具有分布式架构,旨在管理大型系统维度。这种架构包含每个用户一个网络,其中所有网络并行工作,并利用沿阵列的信道的特定非平稳特性。我们的研究结果表明,一旦并行网络进行了训练,他们提供了最佳的SUM解决方案,在超过$80\%$的情况下,导致在一个可以忽略不计的总和率损失相比,使用最佳SUM解决方案的系统,同时提供了一个有见地的方法来重新思考这些类型的问题,没有封闭的形式的解决方案。

英文摘要:

In an extra-large scale MIMO (XL-MIMO) system, the antenna arrays have a large physical size that goes beyond the dimensions in traditional MIMO systems. Because of this large dimensionality, the optimization of an XL-MIMO system leads to solutions with prohibitive complexity when relying on conventional optimization tools. In this paper, we propose a design based on machine learning for the downlink of a multi-user setting with linear pre-processing, where the goal is to select a limited mapping area per user, i.e. a small portion of the array that contains the beamforming energy to the user. We refer to this selection as spatial user mapping (SUM). Our solution relies on learning using deep convolutional neural networks with a distributed architecture that is built to manage the large system dimension. This architecture contains one network per user where all the networks work in parallel and exploit specific non-stationary properties of the channels along the array. Our results show that, once the parallel networks are trained, they provide the optimal SUM solution in more than $80\%$ of the instances, resulting in a negligible sum-rate loss compared to a system using the optimal SUM solution while providing an insightful approach to rethink these kinds of problems that have no closed-form solution.

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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