Spatial multiplexing for multiple users exceeding degree of freedom by successive interference cancellation and zero forcing

The downlink non orthogonal multiple access (NOMA) was proposed by using successive interference cancellation (SIC) at the receiver that enables communication with the terminal over the number of base station antennas. Furthermore, technique using both random beamforming and SIC was proposed. In this paper, we propose the spatial multiplexing for multiple users exceeding degree of freedom at the base station antennas by SIC and zero forcing (ZF). By computer simulation, the proposed method improves the transmission rate compared to the conventional ZF scheme.