基于非正交多址接入中继通信系统的功率优化

针对基于非正交多址接入(NOMA)技术的中继通信系统，在兼顾系统性能与计算复杂度的基础上，该文提出一种结合统计信道信息(S-CSI)和瞬时信道信息(I-CSI)的混合功率分配策略(H-PAS)来有效实现上述折中。仿真结果表明，NOMA方案在H-PAS策略下，一方面比单纯利用S-CSI时的传统正交多址接入技术具有更高的频谱效率；另一方面在和速率差别不大的情况下，又比单纯利用I-CSI时的NOMA方案具有更低的信令开销和计算复杂度。

Power Allocation Optimization of Cooperative Relaying Systems Using Non-orthogonal Multiple Access

A novel scheme termed Hybrid Power Allocation Strategy (H-PAS), which is integrated with Statistical Channel State Information (S-CSI) and Instantaneous Channel State Information (I-CSI), is proposed for Non-Orthogonal Multiple Access (NOMA) based on cooperative relaying systems to achieve a better performance-complexity tradeoff. Simulation results demonstrate that, with the proposed H-PAS, on the one hand, NOMA shows distinct advantage on the sum-rate compared with conventional orthogonal multiple access techniques in which only the knowledge of S-CSI is available; On the other hand, NOMA reduces the signaling overhead and computational complexity at the expense of marginal sum rate degradation when compared with the cases in which only the knowledge of I-CSI is available for it.