High SNR Analysis of RIS-Aided MIMO Broadcast Channels

Dominik Semmler; Michael Joham; Wolfgang Utschick

High SNR Analysis of RIS-Aided MIMO Broadcast Channels

Information Theory 2023-04-17 v2 Signal Processing math.IT

Authors: Dominik Semmler , Michael Joham , Wolfgang Utschick

Abstract

We analyze the influence of a reconfigurable intelligent surface (RIS) on the Gram channel eigenvalues in a high signal-to-noise ratio (SNR) scenario. This allows to connect specific channel properties with the rank improvement capabilities of the RIS. In particular, fundamental limits due to a possible line of sight (LOS) setup between the base station (BS) and the RIS are derived. Furthermore, dirty paper coding (DPC) based schemes are compared to linear precoding in such a scenario and it is shown that under certain channel conditions, the performance gap between DPC and linear precoding vanishes.

Keywords

reconfigurable intelligent surface wireless communication

Cite

@article{arxiv.2210.15259,
  title  = {High SNR Analysis of RIS-Aided MIMO Broadcast Channels},
  author = {Dominik Semmler and Michael Joham and Wolfgang Utschick},
  journal= {arXiv preprint arXiv:2210.15259},
  year   = {2023}
}

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