6G networks; Reconfigurable intelligent surface (RIS); stacked intelligent metasurfaces (SIM); 6g network; Array signal processing; Downlink; Metasurface; Optimisations; Reconfigurable; Reconfigurable intelligent surface; Stacked intelligent metasurface; Control and Systems Engineering; Electrical and Electronic Engineering; Metasurfaces; Optimization; Vectors; Reconfigurable intelligent surfaces; Signal to noise ratio
Abstract :
[en] Stacked intelligent metasurface (SIM) is an emerging design that consists of multiple layers of metasurfaces. A SIM enables holographic multiple-input multiple-output (HMIMO) precoding in the wave domain, which results in the reduction of energy consumption and hardware cost. On the ground of multiuser beamforming, this letter focuses on the downlink achievable rate and its maximization. Contrary to previous works on multiuser SIM, we consider statistical channel state information (CSI) as opposed to instantaneous CSI to overcome challenges such as large overhead. Also, we examine the performance of large surfaces. We apply an alternating optimization (AO) algorithm regarding the phases of the SIM and the allocated transmit power. Simulations illustrate the performance of the considered large SIM-assisted design as well as the comparison between different CSI considerations.
Disciplines :
Computer science
Author, co-author :
Papazafeiropoulos, Anastasios ; University of Hertfordshire, Communications and Intelligent Systems Research Group, Hatfield, United Kingdom ; University of Luxembourg, SnT, Luxembourg City, Luxembourg
Kourtessis, Pandelis ; University of Hertfordshire, Communications and Intelligent Systems Research Group, Hatfield, United Kingdom
CHATZINOTAS, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Kaklamani, Dimitra I.; National Technical University of Athens (Zografou), Microwave and Fiber Optics Laboratory, Athens, Greece
Venieris, Iakovos S.; National Technical University of Athens (Zografou), Intelligent Communications and Broadband Networks Laboratory, School of Electrical and Computer Engineering, Athens, Greece
External co-authors :
yes
Language :
English
Title :
Achievable Rate Optimization for Large Stacked Intelligent Metasurfaces Based on Statistical CSI
Publication date :
31 May 2024
Journal title :
IEEE Wireless Communications Letters
ISSN :
2162-2337
eISSN :
2162-2345
Publisher :
Institute of Electrical and Electronics Engineers Inc.
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