论文标题
朝向大型智能表面（LIS）的通信
Towards Large Intelligent Surface (LIS)-based Communications
论文作者
论文摘要
大型智能表面（LIS）的通信的概念最近引起了研究的关注，其中LI被视为天线阵列，其整个表面积可用于无线电信号传递和接收。为了提供对基于LIS的沟通的基本理解，本文研究了基于LIS的沟通与匹配的过滤的上行链路（UL）性能。我们首先研究了LIS引入的新属性。特别是，理论上呈现和表征了阵列增益，空间分辨率和干扰抑制能力。然后，我们研究了两个可能的LIS系统布局，即UL，即集中式LIS（C-LIS）和分布式LIS（D-LIS）。我们的分析表明，集中式系统具有强大的干扰能力。实际上，如果表面积足够大或频带足够高，则几乎可以消除干扰。对于D-LIS，我们提出了一系列资源分配算法，包括用户关联方案，方向控制和电源控制，以扩展分布式系统的覆盖面积。仿真结果表明，所提出的算法显着改善了系统性能，更重要的是，我们观察到D-Lis在微波带中的表现优于CLIS，而C-LIS在MMWave频段中优于D-LIS。这些观察结果是实用LIS部署的有用指南。
The concept of large intelligent surface (LIS)-based communication has recently raised research attention, in which a LIS is regarded as an antenna array whose entire surface area can be used for radio signal transmission and reception. To provide a fundamental understanding of LIS-based communication, this paper studies the uplink (UL) performance of LIS-based communication with matched filtering. We first investigate the new properties introduced by LIS. In particular, the array gain, spatial resolution, and the capability of interference suppression are theoretically presented and characterized. Then, we study two possible LIS system layouts in terms of UL, i.e., centralized LIS (C-LIS) and distributed LIS (D-LIS). Our analysis showcases that a centralized system has strong capability of interference suppression; in fact, interference can nearly be eliminated if the surface area is sufficient large or the frequency band is sufficient high. For D-LIS, we propose a series of resource allocation algorithms, including user association scheme, orientation control, and power control, to extend the coverage area of a distributed system. Simulation results show that the proposed algorithms significantly improve the system performance, and even more importantly, we observe that D-LIS outperforms CLIS in microwave bands, while C-LIS is superior to D-LIS in mmWave bands. These observations serve as useful guidelines for practical LIS deployments.
