Non-Orthogonal Downlink Transmissions Using Module Multilevel Codes
- Claussen H.
- Fang D.
- Zhang M.
In this paper, a new approach to non-orthogonal multiuser downlink transmission, referred to as modulo multilevel codes based multiuser superposition transmissions (MMC-MUST), is proposed, which addresses the main issues of existing solutions by 1) overcoming the challenge faced by NOMA when users have the similar channel conditions; 2) adopting the modulo multilevel codes for multiuser superposition transmissions which forms a non-uniform composite constellation, offering unequal error protection for near and far users; and 3) supporting arbitrary number of users for superposition transmissions. The simulation results show that the proposed MMC-MUST outperforms NOMA in MIMO systems.