correlated Rayleigh fading; full-duplex communications; massive MIMO; Simultaneously transmitting and reflecting surface (STARS); two-way communications; Correlated Rayleigh fading; Full duplex communication; Full-duplex; Massive MIMO; Reconfigurable; Reflecting surface; Simultaneously transmitting and reflecting surface; Spectral efficiencies; Two way communications; Two ways; Automotive Engineering; Aerospace Engineering; Computer Networks and Communications; Electrical and Electronic Engineering; Stars; Closed-form solutions; Protocols; Wireless communication; Reflection; Optimization; Full-duplex system; Correlation; Channel estimation; Transmission line matrix methods
Abstract :
[en] Low-cost reconfigurable intelligent surfaces (RISs) are being considered as promising physical-layer technology for next-generation wireless networks due to their ability to re-engineer the propagation environment by tuning their elements. Although RIS-aided systems have many advantages, one of their major bottlenecks is that they can provide coverage only in front of the surface. Fortunately, simultaneous transmitting and reflecting surface (STARS)-assisted systems have emerged to fill this gap by providing 360° wireless coverage. In parallel, full-duplex (FD) communication offers a higher achievable rate through efficient spectrum utilization compared to the half-duplex (HD) counterpart. Moreover, two-way/bi-directional communications in an FD system can further enhance the system's spectral efficiency. Hence, in this paper, we propose a STARS-enabled massive MIMO deployment in an FD two-way communication network for highly efficient spectrum utilization, while covering the dead zones around the STARS. This model enables simultaneous information exchange between multiple nodes, while potentially doubling the spectral efficiency (SE). By invoking the use-and-then-forget (UaTF) combining scheme, we derive a closed-form expression for an achievable SE at each user of the system considering both uplink and downlink communications based on statistical channel state information (CSI), while also accounting for imperfect CSI and correlated fading conditions. Moreover, we formulate an optimization problem to obtain an optimal passive beamforming matrix design at the STARS that maximizes the sum achievable SE. The considered problem is non-convex and we propose a provably-convergent low-complexity algorithm, termed as projected gradient ascent method (ProGrAM), to obtain a stationary solution. Extensive numerical results are provided to establish the performance superiority of the FD STARS-enabled system over the HD STARS-enabled and FD conventional RIS (cRIS)-enabled counterparts, and also to show the effect of different parameters of interest on the system performance.
Disciplines :
Computer science
Author, co-author :
Papazafeiropoulos, Anastasios ; University of Hertfordshire, Communications and Intelligent Systems Research Group, Hatfield, United Kingdom ; University of Luxembourg, SnT, Esch-sur-Alzette, 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, Microwave and Fiber Optics Laboratory, Zografou, Greece
Venieris, Iakovos S.; National Technical University of Athens, Intelligent Communications and Broadband Networks Laboratory, School of Electrical and Computer Engineering, Zografou, Greece
External co-authors :
yes
Language :
English
Title :
STARS-Enabled Full-Duplex Two-Way mMIMO System Under Spatially-Correlated Channels
Publication date :
18 February 2025
Journal title :
IEEE Transactions on Vehicular Technology
ISSN :
0018-9545
Publisher :
Institute of Electrical and Electronics Engineers Inc.
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