1-Bit Massive MIMO Transmission: Embracing Interference with Symbol-Level Precoding
1-Bit Massive MIMO Transmission: Embracing Interference with Symbol-Level Precoding
复制标题
DOI：
10.1109/mcom.001.2000601
复制
发表时间：
2021-05-01
影响因子：
11.2
通讯作者：
Yu, Wei
中科院分区：
文献类型：
--
作者：
Li, Ang;Masouros, Christos;Yu, Wei
用于蜂窝基站（BS）的大规模天线阵列（称为大规模MIMO）的部署一直是满足5G通信系统及以后不断增长的容量需求的关键推动因素。尽管全数字大规模MIMO系统具有良好的性能，但其需要大量的硬件组件，包括射频链、功率放大器、数模转换器（DAC）等，导致蜂窝BS的总功耗和硬件成本大幅增加。对于频谱高效和能量高效的大规模MIMO部署，已经提出了许多硬件受限的架构，包括混合模拟-数字结构、恒定包络传输和低分辨率DAC的使用。在这篇文章中，我们概述了最近的进展，提高大规模MIMO系统的错误率性能与1位DAC通过预编码在符号级。这一系列的研究超越了传统的干扰抑制或消除技术，通过逐个符号的基础上管理干扰。这为针对实际大规模MIMO系统定制的干扰感知预编码提供了独特的机会。在这篇文章中，我们首先解释了建设性干扰（CI）的概念，并详细说明了CI如何利用传统的不希望的多用户干扰以及来自不完善的硬件组件的干扰，可以有利于1位信号的设计。然后，我们概述了几种1位信号设计的解决方案，以说明利用CI可实现的增益。最后，我们确定了一些挑战和未来的研究方向，1位大规模MIMO系统，尚未探索。
The deployment of large-scale antenna arrays for cellular base stations (BSs), called massive MIMO, has been a key enabler for meeting the ever increasing capacity requirement for 5G communication systems and beyond. Despite their promising performance, fully digital massive MIMO systems require a large number of hardware components including radio frequency chains, power amplifiers, digital-to-analog converters (DACs), and so on, resulting in a huge increase in terms of the total power consumption and hardware costs for cellular BSs. Toward both spectrally-efficient and energy-efficient massive MIMO deployment, a number of hardware limited architectures have been proposed, including hybrid analog-digital structures, constant-envelope transmission, and the use of low-resolution DACs. In this article, we overview the recent advances in improving the error rate performance of massive MIMO systems with 1-bit DACs through precoding at the symbol level. This line of research goes beyond traditional interference suppression or cancellation techniques by managing interference on a symbol-by-symbol basis. This provides unique opportunities for interference-aware precoding tailored for practical massive MIMO systems. In this article, we first explain the concept of constructive interference (CI) and elaborate on how CI can benefit the 1-bit signal design by exploiting the traditionally undesired multi-user interference as well as the interference from imperfect hardware components. We then overview several solutions for 1-bit signal design to illustrate the gains achievable by exploiting CI. Finally, we identify some challenges and future research directions for 1-bit massive MIMO systems that have yet to be explored.