مينا مومني

Nowadays, visible light communication (VLC) has emerged as one of the key research areas among researchers as a modern communication technology that uses visible light to transmit data. Due to its wide ban‎dwidth an‎d lack of interference with the radio spectrum, VLC has significant potential for various applications such as light fidelity (LiFi), vehicle-to-vehicle (V2V) communication, an‎d underwater communication. However, one of the main challenges of VLC is limited coverage an‎d the presence of dead zones. In this research, the coverage performance of VLC is investigated an‎d optimized using intelligent reflecting surfaces (IRS). IRS is an emerging technology in wireless communications, consisting of an array of programmable reflective elements. Owing to its capability for precise beam shaping an‎d optimization especially in indoor an‎d enclosed environments IRS enables a wide range of applications, including improving coverage an‎d link quality in smart buildings, increasing data rates, an‎d reducing dead zones in communication systems. Therefore, the objective of this study is to simulate an‎d derive closed-form expressions for the network coverage of a VLC system assisted by IRS, an‎d to obtain the optimal IRS placement an‎d orientation angles for optimal network coverage. By reflecting an‎d steering optical waves, IRS can effectively enhance coverage an‎d reduce dead zones. To achieve these goals, mathematical modeling an‎d numerical simulations are carried out to determine the best IRS locations an‎d configurations for coverage optimization. In addition, the effects of various parameters—such as the field of view (FOV), distance, the number an‎d orientation angles of IRS with respect to the light source, as well as the optimal LED transmit power—on system performance are examined.Simulation results indicate that using an IRS with angle optimization reduces the average outage probability by about 71% in the effective signal-to-noise ratio (SNR) range compared to the case without optimization. These results confirm that IRS angle optimization significantly reduces blind spots an‎d substantially improves the coverage of the VLC system.

نور مرئي , سطوح بازتاب هوشمند , سطح پوشش سيستم‌هاي مخابراتي

Visible light , intelligent reflecting surfaces , coverage area of telecommunication systems

Mina Momeni

dr. Seyed Alireza Nezamolhosseini