Downlink beamforming performance of SDM enabled cellular systems

The authors have studied the packet cellular system utilizing SDM (space division multiplexing) technology. This paper evaluates downlink beamforming performance of SDM based FDD packet cellular system by computer simulation under the condition that access terminals are independently and identically distributed in each cell following uniform distribution utilizing premeasured radiation patterns of the 12-element circular array antenna and makes explicit the relation between the angular spread and the number of spatial scheduled users corresponding to the maximal cell throughput. The simulation results show that the average cell throughput can reach up to 9Mbps. The results also show that as angular spread increases, average cell throughput becomes smaller, but can still reach up to 4.44Mbps even when angular spread equals to 10 degree. This indicates that the realistic approaches we adopted are quite promising for next generation mobile communication systems.