Archive | 2021
Intelligent Omni-Surfaces: Ubiquitous Wireless Transmission by Reflective-Refractive Metasurfaces
Abstract
Intelligent reflecting surface (IRS), which is capable to adjust propagation conditions by controlling phase shifts of the reflected waves that impinge on the surface, has been widely analyzed for enhancing the performance of wireless systems. However, the reflective properties of widely studied IRSs restrict the service coverage to only one side of the surface. In this paper, to extend the wireless coverage of communication systems, we introduce the concept of intelligent omni-surface (IOS)-assisted communication. More precisely, IOS is an important instance of reconfigurable intelligent surface (RIS) that is capable to provide service coverage to the mobile users (MUs) in a reflective and a refractive manner. We consider a downlink IOS-assisted communication system, where a multi-antenna small base station (SBS) and an IOS perform beamforming jointly, to improve the received power of multiple MUs on both sides of the IOS, through different reflective/refractive channels. To maximize the sum-rate, we formulate a joint IOS phase shift design and SBS beamforming optimization problem, and propose an iterative algorithm to solve the resulting non-convex program efficiently. Both theoretical analysis S. Zhang, Y. Tan, and L. Song are with Department of Electronics, Peking University, Beijing 100871 China (email: {shuhangzhang, tanggeric, lingyang.song}@pku.edu.cn). H. Zhang and H. V. Poor are with the Department of Electrical Engineering, Princeton University, Princeton, NJ 08544 USA (email: [email protected], [email protected]). B. Di is with Department of Electronics, Peking University, Beijing 100871 China, and also with Department of Computing, Imperial College London, UK (email: [email protected]). M. Di Renzo is with Université Paris-Saclay, CNRS, CentraleSupélec, Laboratoire des Signaux et Systèmes, 91192 Gif-surYvette, France. (email: [email protected]). Z. Han is with Electrical and Computer Engineering Department, University of Houston, and also with the Department of Computer Science and Engineering, Kyung Hee University (email: [email protected]). ar X iv :2 01 1. 00 76 5v 2 [ ee ss .S Y ] 2 8 Ju n 20 21