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In a multi-user millimeter (mm) wave communication system, we consider the problem of estimating the channel response between the central node (base station) and each of the user equipments (UE). We propose three different strategies: 1) Each UE estimates its channel separately, 2) Base station estimates all the UEs' channels jointly, and 3) Two stage process with estimation done at both UE and base station. Exploiting the low rank nature of the mm wave channels, we propose a generalized block orthogonal matching pursuit (G-BOMP) framework for channel estimation in all the three strategies. Our simulation results show that, the average beamforming gain of the G-BOMP algorithm is higher than that of the conventional OMP algorithm and other existing works on the multi-user mm wave system.

Multi-user millimeter wave channel estimation using generalized block OMP algorithm