Date Added: Aug 2010
Using beamforming antennas to improve wireless multicast transmissions has received considerable attention recently. The paper proposes to partition all single-lobe beams into groups and to form composite multi-lobe beam patterns to transmit multicast traffic. Depending on how the power is split among the individual beams constituting a composite beam pattern, two power models are considered: Equal Power Split (EQP), and Asymmetric Power Split (ASP). This paper revisits the key challenge - beam partitioning in the beamforming-multicast problem considered and makes significant progress in both algorithmic and analytic aspects of the problem.