User grouping and scheduling for dual-layer beamforming downlink FD-MIMO systems

This Letter investigates the transmission method for downlink full-dimension multiple-input multiple-output systems. To balance the performance and the amount of channel information acquired at base station, a dual-layer beamforming method is proposed, which exploits the statistical as well as effective channel state information (CSI) of a small fraction of users. User scheduling and grouping algo...