A Novel Power Minimization Precoding Scheme for MIMO-NOMA Uplink Systems

This letter is to investigate the use of non-orthogonal multiple access (NOMA) and new transceiver design for multiple-input multiple-output uplinks. A new NOMA implementation scheme with group interference cancelation is proposed to minimize the total power consumption subject to individual rate requirements. In this scheme, precoders and equalizers for users in the same group are designed jointly, and closed-form design procedures for user precoders are developed. Simulation results show that the proposed NOMA scheme outperforms both orthogonal multiple access transmissions and signal alignment NOMA scheme in terms of total power consumption.