Date Added: Nov 2012
The authors study physical layer multicasting in multicell networks where each base station, equipped with multiple antennas, transmits a common message using a single beamformer to multiple users in the same cell. They investigate two coordinated beamforming designs: the Quality-of-Service (QoS) beamforming and the max-min SINR (Signal-to-Interference-plus-Noise Ratio) beamforming. The goal of the QoS beamforming is to minimize the total power consumption while guaranteeing that received SINR at each user is above a predetermined threshold. They present a necessary condition for the optimization problem to be feasible.