Modulation Division Based User Grouping Transmission in Massive SIMO Systems

A novel user grouping transmission scheme for the massive SIMO system is proposed for 5G health applications in this paper, where the base station (BS) equipped with a large number of antennas. In the proposed scheme, users are divided into different groups, and orthogonal pilot sequences are arranged to different groups, while different users in the same group use the same pilot sequence and a sum- constellation is uniquely divided into a group of sub-constellations for the users in the same group. Orthogonal pilots are utilized to eliminate the interference between different groups, and the modulation division method is used to cancel the interference inner the group. Finally, simulation results demonstrate that our proposed transmission scheme and the user grouping method perform very well.