Simulation results claim an active multi-layer metasurface on a LEO satellite improves spectral and energy efficiency over single-layer RIS designs, but the supporting equations contain serious internal inconsistencies.
Ambient Backscatter: Wireless communication out of thin a ir,
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Enhancing Energy and Spectral Efficiency in IoT-Cellular Networks via Active SIM-Equipped LEO Satellites
Simulation results claim an active multi-layer metasurface on a LEO satellite improves spectral and energy efficiency over single-layer RIS designs, but the supporting equations contain serious internal inconsistencies.