Fig. 1From: Distributed MMSE-based uplink receive combining, downlink transmit precoding and optimal power allocation in cell-free massive MIMO systemsComparison of a cellular massive MIMO system (left) with a CFmMIMO system (right). In a CFmMIMO system, a large number of APs with multiple antennas are connected to a NC, serving a large number of UEs in the coverage areaBack to article page