NOMA-Based Coordinated Direct and Relay Transmission With a Half-Duplex/Full-Duplex Relay

作者：Pei, Xinyue; Yu, Hua; Wen, Miaowen^*; Mumtaz, Shahid; Al Otaibi, Sattam; Guizani, Mohsen

来源：IEEE Transactions on Communications, 2020, 68(11): 6750-6760.

DOI：10.1109/TCOMM.2020.3017002

• Non-orthogonal multiple access
• ergodic sum rate
• outage probability
• decode-and-forward
• full-duplex

In this article, we propose a downlink non-orthogonal multiple access (NOMA) based coordinated direct and relay system with one cell-center user and multiple cell-edge users, where a decode-and-forward (DF) relay bridges the connection between the base station and the cell-edge users. Both full-duplex (FD) and half-duplex (HD) protocols are considered for the relay. We assume that the performance of the cell-edge users is subjected to the relay, and the cancellation of the mutual interference between the relay and cell-center user is imperfect. Both the exact analytical expression of outage probability and an approximate expression of the ergodic sum rate at high signal-to-noise ratio (SNR) are derived. Numerical results demonstrate that: 1) the FD relaying NOMA system outperforms the HD relaying NOMA system at low SNR, but the situation is exactly the opposite at high SNR; 2) the mutual interference can cause a larger performance gap than the self-interference at the relay; 3) the power allocation coefficients for the cell-center user and relay can affect the performance more significantly than those for cell-edge users.(1)

• 单位
  西安电子科技大学