Journal ArticleDOI
Intelligent Omni-Surfaces: Ubiquitous Wireless Transmission by Reflective-Refractive Metasurfaces
Shuhang Zhang,Hongliang Zhang,Boya Di,Yunhua Tan,Marco Di Renzo,Zhu Han,H. Vincent Poor,Lingyang Song +7 more
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TLDR
In this article, the authors considered a downlink IOS-assisted communication system, where a multi-antenna small base station (SBS) and an IOS jointly perform beamforming, for improving the received power of multiple MUs on both sides of the IOS, through different reflective/refractive channels.Abstract:
Intelligent reflecting surfaces (IRSs), which are capable of adjusting the propagation conditions by controlling the phase shifts of the reflected waves that impinge on the surface, have 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, an IOS is an important instance of a reconfigurable intelligent surface (RIS) that can 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 jointly perform beamforming, for improving 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 efficiently solve the resulting non-convex program. Both theoretical analysis and simulation results show that an IOS significantly extends the service coverage of the SBS when compared to an IRS.read more
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Journal ArticleDOI
Reconfigurable Intelligent Surfaces for Wireless Communications: Overview of Hardware Designs, Channel Models, and Estimation Techniques
Men Jian,George C. Alexandropoulos,Ertugrul Basar,Chongwen Huang,Ruiqi Liu,Yuanwei Liu,Chau Yuen +6 more
TL;DR: An overview and taxonomize the latest advances in RIS hardware architectures as well as the most recent developments in the modeling of RIS unit elements and RIS-empowered wireless signal propagation, which constitute a prerequisite step for the optimized incorporation of RISs in future wireless networks.
Journal ArticleDOI
Reconfigurable intelligent surfaces for wireless communications: Overview of hardware designs, channel models, and estimation techniques
TL;DR: In this article , the authors overview and taxonomize the latest advances in RIS hardware architectures as well as the most recent developments in the modeling of RIS unit elements and RIS-empowered wireless signal propagation.
Journal ArticleDOI
Intelligent Omni-Surfaces for Full-Dimensional Wireless Communications: Principles, Technology, and Implementation
TL;DR: In this paper , the authors introduce the concept of an intelligent omni-surface (IOS), which is able to serve mobile users on both sides of the surface to achieve full-dimensional communications by jointly engineering its reflective and refractive properties.
Journal ArticleDOI
An Overview of Signal Processing Techniques for RIS/IRS-Aided Wireless Systems
TL;DR: In this paper , the authors provide a comprehensive overview of RIS/IRS-aided wireless systems from the signal processing perspective, and highlight promising research directions that are worthy of investigation in the future.
Journal ArticleDOI
Simultaneously Transmitting and Reflecting Intelligent Omni-Surfaces: Modeling and Implementation
TL;DR: This article discusses four practical hardware implementations of STAR-IOSs as well as three hardware modeling techniques and five channel modeling methods to clarify the taxonomy of smart surface technologies in support of further investigating the family of STARs.
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