免调度非正交多址接入技术及其系统性能

[摘要] 主要探讨免调度非正交多址接入（NOMA）技术及其系统性能。NOMA技术在实际应用中需要仔细研究和解决用户识别以及信道估计问题，尤其是在有碰撞的情况下。针对该问题，给出了相应的解决方案，以及系统级评估中的建模方法，并对基于预配置方式和随机选择方式的免调度多用户共享接入（MUSA）方案在实际系统中的性能表现进行了系统级仿真评估。仿真结果显示免调度MUSA方案具有明显的性能增益。

[关键词] 非正交多址接入；免调度；多用户共享接入；预配置；随机选择；碰撞

[Abstract] Grant-free non-orthogonal multiple access (NOMA) technology and the system level performance are discussed in this paper. For grant-free NOMA technology, user identification and channel estimation should be carefully studied, especially for the case with collision. The corresponding solutions are provided in this paper, and modelling methods for system level evaluation are also given. The performances of grant-free multi-user shared access (MUSA) based on pre-configuration or random selection are evaluated by system level simulation, the evaluation results show that grant-free MUSA has obvious performance gain with practical assumptions.

[Keywords] NOMA; grant-free; MUSA; pre-configuration; random selection; collision