Joint scheduling and beamforming with superposition coding for efficient resource utilization

Multiple-input multiple-output (MIMO) in wireless systems are capable of meeting the increasing demand of higher data rates. When combined with beamforming and user scheduling, these systems provide high diversity order. In this paper, a MIMO wireless system is considered where users are served in downlink transmission by a single base station (BS) according to their pre-defined data transfer rate (DTR). Here, an approach used by BS for joint scheduling and beamforming in conjunction with superposition coding (JSB-SC) is explained. For the case, when the available DTR for a user is much higher than its demand, JSB-SC allows another user to share the same transmission link without affecting their performance and efficiently utilizes the available resource under the total power constraint. The simulation results show that JSB-SC outperforms JSB in terms of lesser power wastage and increased number of scheduled users with guaranteed DTR.