A Low Complexity Linear Multiuser MIMO Beamforming System With Limited Feedback
In this paper, the authors propose a low complexity linear multiuser beamforming system for the Multiple-Input Multiple-Output (MIMO) broadcast channel. They consider the specific case of transmission of a single information stream to two users with two or more receive antennas. Unlike past work in which an iterative algorithm is required to design the beamformers, they first provide a low complexity non-iterative solution via the generalized eigenvector decomposition to jointly optimize transmit beamforming and receive combining vectors. The proposed beamforming technique works for two or more transmit and receive antennas where perfect channel state information is available at the transmitter.