Layered multi-group steered space-time shift-keying for millimeter-wave communications

We propose a novel multi-user Multiple-Input Multiple-Output (MIMO) technique termed as the Layered Multi-Group Steered Space-Time Shift Keying (LMG-SSTSK) for the downlink of millimeter wave (mmWave) communications, which combines the concepts of Multi-User MIMO (MU-MIMO), Space-Time Shift Keying (STSK), beamforming and Orthogonal Frequency-Division Multiplexing (OFDM) to simultaneously convey information to multiple users. The LMG-SSTSK tackles the propagation challenges of the high-attenuation mmWave frequencies by sub-dividing the users into multiple groups. The proposed system allows more users to be served simultaneously in the downlink over the same time-and frequency-resources than a system dispensing with the proposed grouping technique