  In this paper, a novel optimization model for joint beamforming and power
control in the downlink (DL) of a cell-free massive MIMO (CFmMIMO) system is
presented. The objective of the proposed optimization model is to minimize the
maximum user interference while satisfying quality of service (QoS) constraints
and power consumption limits. The proposed min-max optimization model is
formulated as a mixed-integer nonlinear program, that is directly tractable.
Numerical results show that the proposed joint beamforming and power control
scheme is effective and outperforms competing schemes in terms of data rate,
power consumption, and energy efficiency.
