Multiuser Data Transmission Aided by Simultaneous Transmit and Reflect Reconfigurable Intelligent Surface in Underwater Wireless Optical Communications
The reconfigurable intelligent surface (RIS) can improve energy and spectrum efficiency by directing radio waves. Recent wireless communications research has focused on it. We utilized the simultaneous transmit and reflect (STAR)-RIS to an underwater UWOC system in this work. Despite underwater turbulence, beam attenuation, blockage, and pointing mistakes, a STAR-RIS obtains a UWOC channel to allow multiple users to transfer data in all directions. Exponential and generalized Gamma distributions were used to calculate underwater turbulence-induced fading, and numerical analysis was used to evaluate the outage probability, bit error rate (BER), and channel capacity of direct, conventional, and STAR-RIS assisted UWOC channels. BER performance was also assessed based on reflective element count, modulation method, pointing errors, blockage levels, and transmit-reflection coefficient. Monte-Carlo simulations verified the analytical BER and outage probability conclusions for the average signal-to-noise ratio. Experiments showed the receiving luminous intensity performance compared to the incident beam luminous intensity of the proposed STAR-RIS aided UWOC channel.
Jan 24, 2024
