Reconfigurable intelligent surfaces (RISs) are emerging as key enablers of
reliable industrial automation in the millimeter-wave (mmWave) band,
particularly in environments with frequent line-of-sight (LoS) blockage. While
prior works have largely focused on theoretical aspects, real-time validation
under user mobility remains underexplored. In questo lavoro, we propose and
experimentally evaluate a self-adaptive beamforming algorithm that enables RIS
reconfiguration based on a low-rate feedback link from the mobile user
equipment (UE) to the RIS controller. The algorithm maintains received signal
power above a predefined threshold without requiring UE position knowledge.
Using a hexagonal RIS with 127 elements operating at 23.8 GHz, we validate our
approach in a semi-anechoic environment over a 60 cm*100 cm observation area.
The results demonstrate up to 24 dB gain in received power compared to the
baseline with inactive RIS elements, highlighting the practical benefits of
adaptive RIS control in mobile non-line-of-sight (NLoS) scenarios.

Questo articolo esplora i giri e le loro implicazioni.

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