R. Dinis, J. Guerreiro, Dushantha Nalin Jayakody and F. Cercas, “Multi-User Detection for the Downlink of NOMA Systems with Multi-Antenna Schemes and Power-Efficient Amplifiers,” Physical Communications, https://doi.org/10.1016/j.phycom.2019.01.003 , Jan 2019. (Impact Factor: 1.58).
Non-orthogonal multiple access (NOMA) schemes have been recognized as a promising multiple access method for the fifth generation (5G) communication systems. In NOMA, multiple users can share the same physical channel, which allows for a substantial increase in capacity gains when comparing to conventional orthogonal multiple access (OMA) techniques. This paper considers the downlink transmission of NOMA schemes combined with single-carrier (SC) signals. We present a multi-antenna transmission technique that is compatible with highly efficient power amplifiers without requiring any pre-processing. Furthermore, a multi-user detection scheme based on iterative frequency-domain equalization (FDE) is presented. We show that besides the high power-efficiency of the transmission scheme, the system’s performance can be close to the matched filter bound (MFB).