A two-timescale estimation scheme, 2TCE-TSP, uses piecewise beam training to estimate a ratio vector per block, cutting per-block pilot overhead from M to about M/N_RF.
Millimeter wave communication: A comprehensive survey,
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Piecewise Beam Training and Channel Estimation for RIS-Aided Near-Field Communications
A two-timescale estimation scheme, 2TCE-TSP, uses piecewise beam training to estimate a ratio vector per block, cutting per-block pilot overhead from M to about M/N_RF.