📡 How many layers does a #Stacked #Intelligent #Metasurface need?

New paper: just 2–5 layers hits the sweet spot for both energy & spectral efficiency — with 80% EE gains over digital-only precoding.

#SIM #GreenCommunications #Metasurfaces #6G #WirelessComms arxiv.org/pdf/2504.15737

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