论文标题
极大的MIMO：基本面，挑战，解决方案和未来的方向
Extremely Large-Scale MIMO: Fundamentals, Challenges, Solutions, and Future Directions
论文作者
论文摘要
非常大规模的多输入 - 元素输出（XL-MIMO）是一项有前途的技术，可以增强下一代通信的能力。但是，XL-Mimo仍处于研究的早期阶段，已采用各种硬件和性能分析方案设计。为了说明这些方案之间的差异和相似性，我们全面回顾了本文中现有的XL-MIMO硬件设计和特征。然后，我们从“渠道建模”，“性能分析”和“信号处理”中彻底讨论XL-MIMO的研究状态。引入了一些现有的挑战，并提供了各自的解决方案。然后，我们提出了两个用于混合传播通道建模的案例研究和实际情况的有效自由度（EDOF）计算。使用我们提出的解决方案，我们执行数值结果，以分别使用Unpareallal XL-MIMO表面和多个用户设备来研究场景的EDOF性能。最后，我们讨论了几个未来的研究方向。
Extremely large-scale multiple-input-multiple-output (XL-MIMO) is a promising technology to empower the next-generation communications. However, XL-MIMO, which is still in its early stage of research, has been designed with a variety of hardware and performance analysis schemes. To illustrate the differences and similarities among these schemes, we comprehensively review existing XL-MIMO hardware designs and characteristics in this article. Then, we thoroughly discuss the research status of XL-MIMO from "channel modeling", "performance analysis", and "signal processing". Several existing challenges are introduced and respective solutions are provided. We then propose two case studies for the hybrid propagation channel modeling and the effective degrees of freedom (EDoF) computations for practical scenarios. Using our proposed solutions, we perform numerical results to investigate the EDoF performance for the scenarios with unparallel XL-MIMO surfaces and multiple user equipment, respectively. Finally, we discuss several future research directions.
