Fig. 7From: Distributed MMSE-based uplink receive combining, downlink transmit precoding and optimal power allocation in cell-free massive MIMO systemsConvergence behavior of maximal constraint violation \(\max _{l} \sum _{k=1}^{K} \rho _{k} E\{{\textbf{w}}^{H}_{kl} {\textbf{w}}^{H}_{kl}\}\) of D-DL-TPPA over different iterations with max-sum and max–min power allocation and a per AP transmit power constraintBack to article page