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On the Degrees of Freedom of RIS-Aided Holographic MIMO Systems

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arxiv 2301.07968 v2 pith:KSB7AY6Y submitted 2023-01-19 cs.IT eess.SPmath.IT

Juan Carlos Ruiz-Sicilia , Xuewen Qian , Marco Di Renzo , Vincenzo Sciancalepore , Merouane Debbah , Xavier Costa-Perez This is my paper · ORCID
classification cs.ITeess.SPmath.IT
keywords degreesfadingfreedomperformancericiansystemsystemsanalyze
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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 near-field 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.

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