A two-stage scheme extracts the common BS-RIS channel from virtual single-antenna users then refines user-specific near-field channels via compensated polar sparse recovery and alternating least squares.
Channel estimation for near-field XL-RIS-aided mmwave hybrid beamforming architectures
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Near-field Channel Estimation for XL-RIS-aided mmWave MIMO Systems
A two-stage scheme extracts the common BS-RIS channel from virtual single-antenna users then refines user-specific near-field channels via compensated polar sparse recovery and alternating least squares.