Static Grouping Strategy Design for Beyond Diagonal Reconfigurable Intelligent Surfaces
<|reference_start|>Static Grouping Strategy Design for Beyond Diagonal Reconfigurable Intelligent Surfaces: Beyond diagonal reconfigurable intelligent surface (BD-RIS) extends conventional RIS through novel architectures, such as group-connected RIS, with scattering matrix not restricted to being diagonal. However, it remains unexplored how to optimally group the elements in group-connected RISs to maximize the performance while maintaining a low-complexity circuit. In this study, we propose and model BD-RIS with a static grouping strategy optimized based on the channel statistics. After formulating the corresponding problems, we design the grouping in single- and multi-user systems. Numerical results reveal the benefits of grouping optimization, i.e., up to 60% sum rate improvement, especially in highly correlated channels.<|reference_end|>
@article{nerini2024static,
    title={Static Grouping Strategy Design for Beyond Diagonal Reconfigurable
  Intelligent Surfaces},
    author={Matteo Nerini, Shanpu Shen, Bruno Clerckx},
    journal={arXiv preprint arXiv:2403.09275},
    year={2024},
    archivePrefix={arXiv},
    eprint={2403.09275},
    primaryClass={cs.IT eess.SP math.IT}
}