  In this paper, the zero-forcing (ZF) precoder with max-min power allocation
is proposed for cell-free millimeter wave (mmWave) massive multiple-input
multiple-output (MIMO) systems using low-resolution digital-to-analog
converters (DACs) with limited-capacity fronthaul links. The proposed power
allocation aims to achieve max-min fairness on the achievable rate lower bounds
of the users obtained by the additive quantization noise model (AQNM), which
mimics the effect of low-resolution DACs. To solve the max-min power allocation
problem, an alternating optimization (AO) method is proposed, which is
guaranteed to converge because the global optima of the subproblems that
constitute the original problem are attained at each AO iteration. The
performance of cell-free and small-cell systems is explored in the simulation
results, which suggest that not-too-small fronthaul capacity suffices for
cell-free systems to outperform small-cell systems.
