On the Degrees of Freedom of RIS-Aided Holographic MIMO Systems
Conference: WSA & SCC 2023 - 26th International ITG Workshop on Smart Antennas and 13th Conference on Systems, Communications, and Coding
02/27/2023 at Braunschweig, Germany
Proceedings: ITG-Fb. 308: WSA & SCC 2023
Pages: 6Language: englishTyp: PDF
Authors:
Ruiz-Sicilia, Juan Carlos; Qian, Xuewen; Di Renzo, Marco (Universite Paris-Saclay, CNRS, CentraleSupelec, Laboratoire des Signaux et Systemes, Gif-sur-Yvette, France)
Sciancalepore, Vincenzo; Costa-Perez, Xavier (i2cat Research Center, Spain & Catalan Institution for Research and Advanced Studies (ICREA), Spain & NEC Laboratories Europe GmbH, Germany)
Debbah, Merouane (Technology Innovation Institute, Abu Dhabi, United Arab Emirates)
Abstract:
In this paper, we study surface-based communication systems based on different levels of channel state information for system optimization. We analyze the system performance in terms of rate and degrees of freedom (DoF). We show that the deployment of a reconfigurable intelligent surface (RIS) results in increasing the number of DoF, by extending the nearfield region. Over Rician fading channels, we show that an RIS can be efficiently optimized only based on the positions of the transmitting and receiving surfaces, while providing good performance if the Rician fading factor is not too small.