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Statistical Design of Multi-BD-RIS-Assisted User-Centric Cell-Free Massive MIMO
We study the uplink of a user-centric (UC) cell-free massive MIMO system assisted by multiple beyond-diagonal reconfigurable intelligent surfaces (BD-RISs), under imperfect channel state information (CSI) and pilot reuse. The BD-RISs are modeled as reciprocal, lossless, group-connected scattering ne
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