Prospective Multiple Antenna Technologies for Beyond 5G
Prospective Multiple Antenna Technologies for Beyond 5G
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DOI：
10.1109/jsac.2020.3000826
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发表时间：
2020-08-01
影响因子：
16.4
通讯作者：
Love, David J.
中科院分区：
文献类型：
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作者：
Zhang, Jiayi;Bjornson, Emil;Love, David J.
多天线技术已经吸引了几十年的研究兴趣，并逐渐进入主流通信系统。两个主要的好处是自适应波束形成增益和空间复用，导致每个用户和每个小区的高数据速率，特别是当采用大型天线阵列时。由于多天线技术已成为第五代（5G）网络的关键组成部分，研究界是时候寻找新的多天线技术来满足超5G时代更高的数据速率，可靠性和流量需求。需要全新的方法来实现这些指标的数量级改进。将面临巨大的技术挑战，其中许多挑战尚未确定。在本文中，我们调查了三种新的多天线技术，这些技术可以在5G网络中发挥关键作用：无小区大规模MIMO，波束空间大规模MIMO和智能反射表面。对于每一种技术，我们提出了基本的动机，关键特性，最近的技术进展，并提供我们的未来研究方向的观点。本文并不意味着是一个成熟的主题的调查/教程，而是作为一种催化剂，鼓励更多的研究和实验，在这些多天线技术。
Multiple antenna technologies have attracted much research interest for several decades and have gradually made their way into mainstream communication systems. Two main benefits are adaptive beamforming gains and spatial multiplexing, leading to high data rates per user and per cell, especially when large antenna arrays are adopted. Since multiple antenna technology has become a key component of the fifth-generation (5G) networks, it is time for the research community to look for new multiple antenna technologies to meet the immensely higher data rate, reliability, and traffic demands in the beyond 5G era. Radically new approaches are required to achieve orders-of-magnitude improvements in these metrics. There will be large technical challenges, many of which are yet to be identified. In this paper, we survey three new multiple antenna technologies that can play key roles in beyond 5G networks: cell-free massive MIMO, beamspace massive MIMO, and intelligent reflecting surfaces. For each of these technologies, we present the fundamental motivation, key characteristics, recent technical progresses, and provide our perspectives for future research directions. The paper is not meant to be a survey/tutorial of a mature subject, but rather serve as a catalyst to encourage more research and experiments in these multiple antenna technologies.