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arXiv 2103.11199cs.ITeess.SPmath.IT
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毫米波无蜂窝大规模MIMO系统中的联合模拟波束选择和数字波束形成

Joint Analog Beam Selection and Digital Beamforming in Millimeter Wave Cell-Free Massive MIMO Systems

Cenk M. Yetis, Emil Björnson, Pontus Giselsson

摘要:

无小区大规模MIMO系统由许多分布式接入点组成,这些接入点具有共同为用户服务的简单组件。在毫米波段中,只能支持有限的一组预定波束。在整合这些技术的网络中,下行链路模拟波束选择对于网络和速率最大化来说是一项具有挑战性的任务。低成本的数字滤波器可以进一步提高网络的和速率。在这项工作中,我们提出了低成本的模拟波束选择和数字滤波器的联合设计。所提出的联合设计实现显着更高的总和率比不相交的设计基准。有监督机器学习(ML)算法能够以低计算复杂性有效地逼近联合设计的波束选择决策的输入输出映射函数。由于ML算法的训练是离线执行的,因此我们提出了一种构造良好的联合设计,该设计结合了多个初始化、迭代和选择特征,以及波束冲突控制,即,同一波束不能用于多个用户。数值结果表明,ML算法可以保持99-100%的原始和率的结果所提出的构造良好的设计。

英文摘要:

Cell-free massive MIMO systems consist of many distributed access points with simple components that jointly serve the users. In millimeter wave bands, only a limited set of predetermined beams can be supported. In a network that consolidates these technologies, downlink analog beam selection stands as a challenging task for the network sum-rate maximization. Low-cost digital filters can improve the network sum-rate further. In this work, we propose low-cost joint designs of analog beam selection and digital filters. The proposed joint designs achieve significantly higher sum-rates than the disjoint design benchmark. Supervised machine learning (ML) algorithms can efficiently approximate the input-output mapping functions of the beam selection decisions of the joint designs with low computational complexities. Since the training of ML algorithms is performed off-line, we propose a well-constructed joint design that combines multiple initializations, iterations, and selection features, as well as beam conflict control, i.e., the same beam cannot be used for multiple users. The numerical results indicate that ML algorithms can retain 99-100% of the original sum-rate results achieved by the proposed well-constructed designs.

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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