Spectral Efficiency Enhancement for Spatially Non-Stationary XL-RIS-Aided Systems With Dual-Side VR Estimation
This letter investigates spatial non-stationarities at both the reconfigurable intelligent surface (RIS) and base station, where only partial arrays, referred to as the visibility region (VR), can receive user signals. To improve spectral efficiency (SE) in frequency division duplexing systems, we embed VR estimation i...