Cyclically extended DFT pilot sequences restore pilot orthogonality under asynchronous reception in user-centric cell-free MIMO, making channel estimation accuracy nearly match the synchronous case.
Cell-free massive mimo with multi-antenna users and phase misalignments: A novel partially coherent transmission framework,
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Channel Estimation with Asynchronous Reception for User-Centric Cell-Free MIMO Systems
Cyclically extended DFT pilot sequences restore pilot orthogonality under asynchronous reception in user-centric cell-free MIMO, making channel estimation accuracy nearly match the synchronous case.