We address the problem of interference leakage (IL) minimization in the K-user multiple-input multiple-output (MIMO) interference channel (IC) assisted by a reconfigurable intelligent surface (RIS). We describe an iterative algorithm based on block coordinate descent to minimize the IL cost function. A reformulation of the problem provides a geometric interpretation and shows interesting connections with envelope precoding and phase-only zero-forcing beamforming problems. As a result of this analysis, we derive a set of necessary (but not sufficient) conditions for a phase-optimized RIS to be able to perfectly cancel the interference on the K-user MIMO IC.
@article{arxiv.2303.03014,
title = {Interference Leakage Minimization in RIS-assisted MIMO Interference Channels},
author = {Ignacio Santamaria and Mohammad Soleymani and Eduard Jorswieck and Jesus Gutierrez},
journal= {arXiv preprint arXiv:2303.03014},
year = {2023}
}
Comments
Accepted at ICASSP 2023 - 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)