BEACHES estimates mmWave massive MIMO channels by soft-thresholding the DFT beamspace channel, selecting the threshold automatically via Stein's unbiased risk estimate to minimize mean squared error in the large-antenna limit.
Channel estimation and hybrid precoding for millimeter wave cellular systems,
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BEACHES: Beamspace Channel Estimation for Multi-Antenna mmWave Systems and Beyond
BEACHES estimates mmWave massive MIMO channels by soft-thresholding the DFT beamspace channel, selecting the threshold automatically via Stein's unbiased risk estimate to minimize mean squared error in the large-antenna limit.