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arXiv 2406.04456eess.SPcs.AIcs.LG
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利用图神经网络学习无蜂窝大规模MIMO的最优线性预编码

Learning Optimal Linear Precoding for Cell-Free Massive MIMO with GNN

Université Paris-Saclay(巴黎-萨克雷大学);Centrale-Supélec(中央高等电力学院);Nokia Bell Labs(诺基亚贝尔实验室)

Benjamin Parlier, Lou Salaün, Hong Yang

AI总结:

本文提出OLP-GNN图神经网络,将无蜂窝大规模MIMO的最优线性预编码转化为节点级预测任务,在1-2毫秒内实现接近B-SOCP最优解的频谱效率。

摘要:

我们开发了一种图神经网络(GNN),用于在实际系统所需的1至2毫秒时间预算内,计算最大化无蜂窝大规模MIMO系统(一项关键的6G无线技术)下行用户最小数据速率的最优线性预编码器(OLP)。目前最先进的方法是基于二阶锥规划可行性测试的二分搜索(B-SOCP),其速度比实际系统要求慢一个数量级。我们的方法依赖于将OLP表示为图上的节点级预测任务。我们构建了一个图,准确捕捉接入点(AP)与用户设备(UE)之间的相互依赖关系,以及最大最小问题的置换等变性。我们提出的神经网络名为OLP-GNN,在由B-SOCP获得的数据上进行训练。我们针对OLP-GNN的规模进行了定制设计,并结合多种精巧的数据预处理和后处理方法,以满足运行时间要求。通过大量仿真,我们证明该方法在不同接入点和用户设备数量的多种场景下,以及视距和非视距无线传播环境中,均能实现接近最优的频谱效率。

英文摘要:

We develop a graph neural network (GNN) to compute, within a time budget of 1 to 2 milliseconds required by practical systems, the optimal linear precoder (OLP) maximizing the minimal downlink user data rate for a Cell-Free Massive MIMO system - a key 6G wireless technology. The state-of-the-art method is a bisection search on second order cone programming feasibility test (B-SOCP) which is a magnitude too slow for practical systems. Our approach relies on representing OLP as a node-level prediction task on a graph. We construct a graph that accurately captures the interdependence relation between access points (APs) and user equipments (UEs), and the permutation equivariance of the Max-Min problem. Our neural network, named OLP-GNN, is trained on data obtained by B-SOCP. We tailor the OLP-GNN size, together with several artful data preprocessing and postprocessing methods to meet the runtime requirement. We show by extensive simulations that it achieves near optimal spectral efficiency in a range of scenarios with different number of APs and UEs, and for both line-of-sight and non-line-of-sight radio propagation environments.

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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