Multiuser MIMO Downlink Beamforming Based on Group Maximum SINR Filtering with Per Stream Power Allocation

We propose an algorithm which iteratively computes the transmit-receive beamforming filters and the power allocation matrix to solve the multiuser multi-input multi-output (MIMO) downlink beamforming problem under signal-to-interference- plus-noise-ratio (SINR) constraints. The transmitter is a multi- antenna base-station broadcasting to users. Each user has multiple antennas at the receiver. The beamforming filter is a group maximum SINR filter which exploits intra-group cooperation, and the power allocated to each data stream is adjusted to enhance performance. Simulation results verify the superiority of the proposed algorithm over previous works.