Double reconfigurable intelligent surface-assisted wireless communication system for energy efficiency improvement over weibull fading channels

R. Mahammad Rafi (), V. Nivetha () and V. Sudha ()
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R. Mahammad Rafi: National Institute of Technology
V. Nivetha: National Institute of Technology
V. Sudha: National Institute of Technology

Telecommunication Systems: Modelling, Analysis, Design and Management, 2023, vol. 83, issue 3, No 6, 289-301

Abstract: Abstract In this paper, we propose a double reconfigurable intelligent surface (RIS)-assisted wireless communication system to improve energy efficiency when a direct link from source to destination is obstructed. First, we model a single RIS-assisted wireless communication system by deploying RIS midway between the source and destination link over the Weibull fading channel. Next, we consider the double-RIS system, in which RIS-1 (R1) and RIS-2 (R2) are near the source and destination respectively, with overall reflecting elements in the system equal to the single-RIS system. For both systems, we derive the closed-form expressions for the bounds (lower and upper) of ergodic capacity and exact closed-form expressions for outage probability. The accuracy of the presented theoretical framework is validated through Monte-Carlo simulations. From the comparison, we found that the double-RIS system surpasses the S-RIS system in terms of ergodic capacity and outage probability. Finally, we provide the ergodic capacity and energy efficiency analysis of both systems as a function of spectral efficiency by varying the position of RISs and notice that the double-RIS system with R1 and R2 near to source and destination is more energy efficient than the S-RIS system.

Keywords: Reconfigurable intelligent surface; Ergodic capacity; Outage probability; Energy efficiency; Weibull fading (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11235-023-01023-3

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