For SIM-enhanced multiuser MISO downlinks, a hybrid digital and wave precoding framework with a realistic power model shows that 2 to 5 SIM layers balances energy and spectral efficiency, and can improve energy efficiency by 80% over digital-only precoding.
RIS-aided cell-free massive MIMO systems for 6 G: Fundamentals, system design, and applications,
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Energy-Efficient SIM-assisted Communications: How Many Layers Do We Need?
For SIM-enhanced multiuser MISO downlinks, a hybrid digital and wave precoding framework with a realistic power model shows that 2 to 5 SIM layers balances energy and spectral efficiency, and can improve energy efficiency by 80% over digital-only precoding.