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Multiuser beamforming is considered for partially-connected millimeter wavemassive MIMO systems. Based on perfect channel state information (CSI), alow-complexity hybrid beamforming scheme that decouples the analog beamformerand the digital beamformer is proposed to maximize the sum-rate. The analogbeamformer design is modeled as a phase alignment problem to harvest the arraygain. Given the analog beamformer, the digital beamformer is designed bysolving a weighted minimum mean squared error problem. Then based on imperfectCSI, an analog-only beamformer design scheme is proposed, where the designproblem aims at maximizing the desired signal power on the current user andminimizing the power on the other users to mitigate the multiuser interference.The original problem is then transformed into a series of independent beamnulling subproblems, where an efficient iterative algorithm using themajorization-minimization framework is proposed to solve the subproblems.Simulation results show that, under perfect CSI, the proposed scheme achievesalmost the same sum-rate performance as the existing schemes but with lowercomputational complexity; and under imperfect CSI, the proposed analog-onlybeamforming design scheme can effectively mitigate the multiuser interference.

Multiuser Beamforming for Partially-Connected Millimeter Wave Massive MIMO