文档介绍：5G通信系统中massive-MIMO-FBMC技术的结合概述
massive MIMO-FBMC技术综述
摘 要
为了应对第五代移动通信（5G）中更高数据率和更低时延的需求，大规模MIMO（massive multiple-input multiple-output）技术已经被提出并被广泛研究。大规模MIMO技术能大幅度地提升多用户网络的容量。而在5G中的带宽研究方面，特别是针对碎片频谱和频谱灵活性问题，现有的正交频分多址（Orthogonal Frequency Division Multiplexing, OFDM）技术不可能应对未来的挑战，新的波形方案需要被设计出来。基于此，FBMC（filter bank multicarrier）技术由于具有比OFDM低得多的带外频谱泄露而被受到重视，并已被标准推进组IMT-2020列为5G物理层的主要备选方案之一。
本文首先回顾了5G中波形设计方案（主要是FBMC调制）和大规模多天线系统（即massive MIMO）的现有工作和主要挑战。然后，简要介绍了基于Massive MIMO的FBMC系统中的自均衡性质，该性质可以用于减少系统所需的子载波数目。同时，FBMC中的盲信道跟踪性质可以用于消除massive MIMO系统中的导频污染问题。尽管如此，如何将FBMC技术应用于massive MIMO系统中的误码率、计算复杂度、线性需求等方面仍然不明确，未来更多的研究工作需要在massive MIMO-FBMC方面展开来。
关键词：大规模MIMO；FBMC；自均衡；导频污染；盲均衡
Abstract
In order to address the requirements of higher data rates and lower latency in the fifth generation mobile communication systems (5G), massive multiple-input multiple-output (MIMO) has been proposed and is currently an active area of research. This is due to the fact that they can greatly increase the capacity of multiuser networks. In the quest for bandwidth, particular challenges that need to be addressed in the context of 5G are fragmented spectrum and spectrum agility. It is unlikely that these challenges can be satisfied using Orthogonal Frequency Division Multiplexing (OFDM), and new waveforms are required. The filter bank multicarrier (FBMC) technique has been listed by IMT-2020 as one of the key physical layer candidates in 5G, since the FBMC has much lower out-of-band radiation than the OFDM.
This article reviews existing related work and identifies the main challenges in the key 5G area at the intersection of waveform design (especially for FBMC) and large-scale multiple antenna systems, also known as Massive MIMO. The property of self-equalization is then introduced for FBMC-based Massive MIMO, which can reduce the number of subcarriers required by the system. It is also shown that the blind channel tracking property of FBMC can be used to address pilot contamination -