Fig. 6From: Distributed MMSE-based uplink receive combining, downlink transmit precoding and optimal power allocation in cell-free massive MIMO systemsConvergence behavior of \(\sum _{k=1}^{K}\) SE\(^{\mathrm{DL},2}_{k}\) and \(\min _{k}\) SE\(^{\mathrm{DL},2}_{k}\) for D-DL-TPPA over different iterations with max-sum (upper figure) and max–min (lower figure) power allocation and a per AP transmit power constraintBack to article page