Channel Norm-Based Power Control in Downlink Multi-User Distributed MIMO Systems

We consider distributed multiple-input multiple-output systems with remote antennas (RA) connected to the base station via high-capacity backhaul, which are operated under the per-antenna power constraint (PAPC). We propose a simple strategy to determine the transmission power for each user, referred to as channel norm-based power control (NBPC) to obtain near-optimal performance in terms of the sum-rate maximization and the log-sum-rate maximization for fairness improvement, applicable to any number of RAs and users. In particular, a closed-form solution to maximize the sum-rate using the NBPC is presented. We also show that the proposed strategy used in conjunction with existing multi-user transmission schemes derived under the total power constraint can be efficiently applied to systems under the PAPC.