A Zero-Forcing Approach for the RIS-Aided MIMO Broadcast Channel

Dominik Semmler; Michael Joham; Wolfgang Utschick

A Zero-Forcing Approach for the RIS-Aided MIMO Broadcast Channel

Information Theory 2023-11-21 v1 Signal Processing math.IT

Authors: Dominik Semmler , Michael Joham , Wolfgang Utschick

Abstract

We present efficient algorithms for the sum-spectral efficiency (SE) maximization of the multi-user reconfigurable intelligent surface (RIS)-aided multiple-input multiple-output (MIMO) broadcast channel based on a zero-forcing approach. These methods conduct a user allocation for which the computation is independent of the number of elements at the RIS, that is usually large. Specifically, two algorithms are given that exploit the line-of-sight (LOS) structure between the base station (BS) and the RIS. Simulations show superior SE performance compared to other linear precoding algorithms but with lower complexity.

Keywords

reconfigurable intelligent surface mimo beamforming precoding for mimo systems

Cite

@article{arxiv.2311.11769,
  title  = {A Zero-Forcing Approach for the RIS-Aided MIMO Broadcast Channel},
  author = {Dominik Semmler and Michael Joham and Wolfgang Utschick},
  journal= {arXiv preprint arXiv:2311.11769},
  year   = {2023}
}

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