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Preprint · October 11, 2023

Irregular STAR-RIS-Aided Wireless Systems with a Limited Number of Passive Elements

Ahmed S. Ben Fadel, Taissir Y. Elganimi, Khaled Maaiuf Rabie, Galymzhan Nauryzbayev, Xingwang Li

Galymzhan Nauryzbayev
Read on dx.doi.orgPDFDOI 10.36227/techrxiv.24247627.v1

Abstract

Simultaneous transmitting and reflecting reconfigurable intelligent surfaces (STAR-RISs) have recently gained a great deal of attention due to their ability of providing full-space service coverage. In this paper, a novel concept called irregular STAR-RIS is proposed with a small portion of activated transmitting and reflecting elements, where users in opposite sides of the surface are served simultaneously. In this proposed system, a tabu search-based sparse deployment and neighbor extraction-based cross-entropy method for the beamforming optimization of the proposed irregular STAR-RIS are considered. For the sake of fair comparison and to highlight the achievable gains, the weighted sum-rate (WSR) performance of a regular STAR-RIS-aided wireless system and a traditional system without STAR-RIS is also evaluated. The results show that the proposed irregular STAR-RIS with a small portion of active elements is capable of significantly improving the WSR performance compared to the conventional systems without STAR-RIS. It is also shown that the position of the users has an impact on the WSR performance, and that the near users have better performance than the far ones.

Advanced Wireless Communication TechnologiesAdvanced Antenna and Metasurface TechnologiesMillimeter-Wave Propagation and ModelingSTAR-RISbeamforming optimizationtabu search

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