Zero-forcing DPC beamforming design for multiuser MIMO broadcast channels

The sum rate maximization in multiuser MIMO broadcast channels is investigated in this paper. We first propose an approach under a total power constraint. Compared with the most related methods in the literature, the proposed method can be easily adapted to a more realistic per-antenna power constraint. Since the power of each antenna is limited individually by the linearity of its power amplifier in practice, the per-antenna power constraint is more practical. Secondly, we propose a novel beamforming method under the per-antenna power constraint, a better sum rate performance is achieved compared with the methods in the literature. Moreover, the proposed method works even if the number of total receive antennas is larger than that of transmit antennas.