  Distributed phased arrays based multiple-input multiple-output (DPA-MIMO) is
a recently proposed highly reconfigurable architecture enabling both spatial
multiplexing and beamforming in millimeter-wave (mmWave) systems. In this work,
we focus on coping with the hybrid precoding for the wideband DPA-MIMO system
with orthogonal frequency division multiplexing (OFDM) modulation. More
specifically, we propose an alternating direction method of multipliers (ADMM)
enabled hybrid precoding approach based on an alternating optimization
framework, abbreviated to ADMM-AltMin, for such cooperative array-of-subarrays
structures. Simulation results show that the proposed ADMM-AltMin method
achieves favourable performance with practical quantization of phase shifters
taken into account.
