Performance of Massive MIMO aided by Reflective Intelligent Surfaces

Abstract Reflective intelligent surfaces (RIS) are large passive panels with hundreds or thousands of passive reflective meta- surface sensors, with the ability to electronically adjust the angle- of-departure (AoD) of the incident signal but not to apply any amplification and signal processing to the radio frequency signal. This technology is up-and-coming for networks beyond 5G (B5G). We evaluate the performance gains, including SINR and outage probability (OP) of RIS-aided massive MIMO systems regard- ing the conventional massive MIMO systems, highlighting the potential of beamforming performance and RIS element phase- shift optimization, aiming to deal with dense urban obstacles scenarios and high density of mobile users. This work aims to investigate the behavior of a RIS-aided MIMO system under different channel scenarios, considering the Rician factor.