Reconfigurable Intelligent Surfaces (RIS) are passive or semi-passive heterogeneous metasurfaces and consist of many tunable elements. RIS is gaining momentum as a promising new technology to enable transforming the propagation environment into controllable parameters. In this paper, we investigate the co-design of per-subcarrier power allocation matrices and multielement RIS phase shifts in downlink wideband MIMO transmission using 28 GHz frequency bands. Our contributions in improving RIS-aided links include (1) enhanced system modeling with pathloss and blockage modeling, and uniform rectangular array (URA) design, (2) design of gradient ascent co-design algorithm, and (3) asymptotic (Big O) complexity analysis of proposed algorithm and runtime complexity evaluation.
@article{arxiv.2201.01739,
title = {Spectral Efficiency Optimization for mmWave Wideband MIMO RIS-assisted Communication},
author = {Pooja Nuti and Elyes Balti and Brian L. Evans},
journal= {arXiv preprint arXiv:2201.01739},
year = {2022}
}