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Reconfigurable intelligent surface (RIS)-empowered communication is one ofthe promising 6G technologies that allows the conversion of the wirelesschannel into an intelligent transmit entity by manipulating the impinging wavesusing man-made surfaces. In this paper, the potential benefits of using RISsare investigated for indoor/outdoor setups and various frequency bands (fromsub 6 GHz to millimeter-waves). First, a general system model with a single RISis considered and the effect of the total number of reflecting elements on theprobabilistic distribution of the received signal-to-noise ratio and errorperformance is investigated under Rician fading. Also for this case, the pathloss exponent is analyzed by considering empirical path loss models.Furthermore, transmission models with multiple RISs are developed and analyzedfor indoor and outdoor non line-of-sight (NLOS) scenarios. The conventional RISselection strategies are also integrated for systems equipped with multipleRISs for the first time. Through extensive simulations, it is demonstrated thatthe RIS-assisted systems provide promising solutions for indoor/outdoorscenarios at various operating frequencies and exhibit significant results inerror performance and achievable data rates even in the presence of systemimperfections such as limited range phase adjustment and imperfect channelphase estimation at RISs.

Modeling and Analysis of Reconfigurable Intelligent Surfaces for Indoor and Outdoor Applications in Future Wireless Networks