An Overview of Signal Processing Techniques for RIS/IRS-Aided Wireless Systems
Cunhua Pana b, Gui Zhouc, Kangda Zhid, Sheng Honge, Tuo Wud, Yijin Pana b, Hong Rena b, Marco Di Renzof g, Arnold Lee Swindlehursth, Rui Zhangi j, Ying–Jun Angela Zhangk
- aNational Mobile Communications Research Laboratory, Southeast University, Nanjing, Jiangsu, China
- bSEU - Southeast University = Dongnan Daxue (2 Sipailou Street, Xuanwu District, Nanjing, Jiangsu, 210096 - China)
- cInstitute for Digital Communications, Friedrich-Alexander-University ErlangenNrnberg, Erlangen, Germany
- dSchool of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K
- eInformation Engineering School, Nanchang University, Nanchang, Jiangxi, China
- fCNRS, CentraleSupélec, Laboratoire des Signaux et Systèmes, Université
- gParis-Saclay, Gif-sur-Yvette, France
- hCenter for Pervasive Communications and Computing, University of California, Irvine, CA, USA
- iThe Chinese University of Hong Kong, Shenzhen and Shenzhen Research Institute of Big Data, Shenzhen, Guangdong, China
- jNUS - National University of Singapore (21 Lower Kent Ridge Rd, Singapour 119077 - Singapore)
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Abstract
In the past as well as present wireless communication systems, the wireless propagation environment is regarded as an uncontrollable black box that impairs the received signal quality, and its negative impacts are compensated for by relying on the design of various sophisticated transmission/reception schemes. However, the improvements through applying such schemes operating only at two endpoints (i.e., transmitter and receiver) are limited even after five generations of wireless systems. Reconfigurable intelligent surface (RIS) or intelligent reflecting surface (IRS) have emerged as a new and promising technology that can configure the wireless environment in a favorable manner by properly tuning the phase shifts of a large number of quasi passive and low-cost reflecting elements, thus standing out as a promising candidate technology for the next/sixth-generation (6G) wireless system. However, to reap the performance benefits promised by RIS/IRS, efficient signal processing techniques are crucial, for a variety of purposes such as channel estimation, transmission design, radio localization, and so on. In this paper, we provide a comprehensive overview of recent advances on RIS/IRS-aided wireless systems from the signal processing perspective.We also highlight promising research directions that are worthy of investigation in the future.
TL;DRThis paper provides a comprehensive overview of recent advances on RIS/IRS-aided wireless systems from the signal processing perspective and highlights promising research directions that are worthy of investigation in the future. (Semantic Scholar)