Channel estimation via GAMP for millimeter wave hybrid massive MIMO systems

In this paper, we study the channel estimation problem for the millimeter wave (mm-wave) hybrid massive multiple-input multiple-output (MIMO) system. Based on the sparsity exhibited by the mm-wave channel in the angular domain, we select a portion of the beams that contribute to the communication process from the beam- space. Then, the generalized approximate message passing (GAMP) is employed to estimate the corresponding channel parameters.