2021/05/09 by Abdullah M. Almasoud, Almasoud, Abdullah, Mohamed Y. Selim +5
Engineering · #Advanced Antenna and Metasurface Technologies #Advanced Wireless Communication Technologies #Emerging Technologies (cs.ET) #FOS: Computer and information sciences #FOS: Electrical engineering #Satellite Communication Systems #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2106.15269
openalex publication_date 2021/05/09 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Recently, there has been a flurry of research on the use of Reconfigurable\nIntelligent Surfaces (RIS) in wireless networks to create dynamic radio\nenvironments. In this paper, we investigate the use of an RIS panel to improve\nbi-directional communications. Assuming that the RIS will be located on the\nfacade of a building, we propose to connect it to a solar panel that harvests\nenergy to be used to power the RIS panel's smart controller and reflecting\nelements. Therefore, we present a novel framework to optimally decide the\ntransmit power of each user and the number of elements that will be used to\nreflect the signal of any two communicating pair in the system (user-user or\nbase station-user). An optimization problem is formulated to jointly minimize a\nscalarized function of the energy of the communicating pair and the RIS panel\nand to find the optimal number of reflecting elements used by each user.\nAlthough the formulated problem is a mixed-integer non-linear problem, the\noptimal solution is found by linearizing the non-linear constraints. Besides, a\nmore efficient close to the optimal solution is found using Bender\ndecomposition. Simulation results show that the proposed model is capable of\ndelivering the minimum rate of each user even if line-of-sight communication is\nnot achievable.\n