  Millimeter wave (mmWave) systems operating over a wide bandwidth and using a
large number of antennas impose a heavy burden on power consumption. In a
massive multiple-input multiple-output (MIMO) uplink, analog-to-digital con-
verters (ADCs) would be the primary consumer of power in the base station
receiver. This paper proposes a bit allocation (BA) method for mmWave
multi-user (MU) massive MIMO systems under a power constraint. We apply ADCs to
the outputs of an analog phased array for beamspace projection to exploit
mmWave channel sparsity. We relax a mean square quantization error (MSQE)
minimization problem and map the closed-form solution to non-negative integer
bits at each ADC. In link-level simulations, the proposed method gives better
communication performance than conventional low-resolution ADCs for the same or
less power. Our contribution is a near optimal low-complexity BA method that
minimizes total MSQE under a power constraint.
