Rate Optimization in Wideband RIS-assisted Wireless Systems

This research focuses on rate optimization in wideband RIS-assisted wireless systems, specifically investigating MIMO RIS-assisted systems in sub-6 GHz mmWave settings. Pathloss and blockage modeling, along with LOS vs. spectral efficiency and RIS-UE distance vs. spectral efficiency analyses, are key components of the study. Results indicate a correlation between RIS-UE distance and spectral efficiency, shedding light on the potential of reconfigurable intelligent surfaces for enhancing wireless communication performance. The findings emphasize the importance of optimizing rates in RIS-assisted wireless systems to improve overall system efficiency.

• Rate Optimization
• RIS-assisted
• Wireless Systems
• MIMO
• Pathloss Modeling

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1. Rate Optimization in Wideband RIS-assisted Wireless Systems Pooja Nuti, Elyes Balti, Brian L. Evans December 3rd, 2021 The University of Texas at Austin Wireless Networking & Communications Group (WNCG) Embedded Signal Processing Laboratory (ESPL) 1

2. Rate Optimization in Wideband MIMO RIS-assisted wireless systems Sub-6 GHz mmWave Setting Pathloss Modeling Added Uniform linear array Uniform panel array Blockage on direct path between BS and UE Rician channels considered ~ i.i.d 2

3. Pathloss Modeling and Blockage Modeling Pathloss Modeling Blockage Modeling Pathloss exponent for NLOS greater than LOS exponent with higher number of rays/clusters [1] N. S. Perovi , L. -N. Tran, M. Di Renzo and M. F. Flanagan, "Achievable Rate Optimization for MIMO Systems With Reconfigurable Intelligent Surfaces," in IEEE Transactions on Wireless Communications, vol. 20, no. 6, pp. 3865-3882, June 2021, 3

4. Results (subject to change...) Prob. LOS vs Spectral Efficiency RIS-UE Distance vs Spectral Efficiency 45 Gradient Random No RIS 40 35 Spectral Efficiency (bits/s/Hz) 30 25 20 15 10 5 0 0 20 40 60 80 100 120 140 160 180 200 Distance between RIS-UE (m) 4