Proposed Multiple Reconfigurable Intelligent Surfaces to Mitigate the Inter-User-Interference Problem in NLOS

Abstract

Reconfigurable Intelligent Surfaces (RIS) are gaining significant global interest as a potential technology that could enable 6G. An efficient method employs passive element reflectors to extend coverage of the non-line of sight (NLOS) millimeter-wave (mm-wave) signal. The suggested model depicts a communication situation involving many users utilizing the RIS in the presence of impediments obstructing the direct path between the users and the transmitter. There is no unobstructed visual connection between sending the message and the person receiving it. The RIS enables communication using an oblique line of vision. Inter-user interference (IUI) refers to the interference that occurs when numerous users are active in the same region, which affects the received signal of a single user. Multiple remote inspection systems (RISs) of different heights have been suggested as potential solutions for addressing this issue. The results illustrate the impact of interference among users in a communication system supported by a reconfigurable intelligent surface (RIS) at various elevations in a millimeter-wave environment. Furthermore, the findings demonstrate that this idea effectively reduced the impact of the IUI. The Signal-to-Interference-plus-Noise Ratio (SINR) was enhanced for all users. The improvement percentages for the first, second, and third users are 46%, 40%, and 38%, respectively.

Keywords

• reconfigurable intelligent surfaces
• mm-wave environment
• signal-to-interference-plus-noise ratio
• ris height
• vlos