Description

Reconfigurable intelligent surfaces (RIS) or intelligent reflecting surfaces (IRSs) are regarded as one of the most promising and revolutionized techniques for enhancing the spectrum and/or energy efficiency of wireless systems. They are capable of reconfiguring the wireless propagation environment by carefully tuning the phase shifts of a large number of low-cost passive reflecting elements. In a typical scenario envisioned for their operation, the optimal reflection coefficients of the RIS are calculated at the BS, and then sent to the RIS’s controller through a dedicated feedback link. The design of the reflection coefficients depends on the channel state information (CSI), which is only updated when the CSI changes, on a much longer time scale than the data symbol duration. Hence, low-rate information exchange is sufficient for the dedicated control link, which can be implemented using low-cost copper lines or simple cost-efficient wireless transceivers.

The package contains a simulation environment and code package, based on Matlab, that generates and reproduces numerical results related to FIVE key scientific articles in the domain of  Reconfigurable intelligent surfaces (RIS) or intelligent reflecting surfaces (IRSs). The Matlab codes are related to the following:

• Modeling of RIS
• Comparing RIS vs Relaying
• Comparing RIS vs Massive MIMO
• Mobile Propagation Model of RIS
• Channel Estimation of RIS