This paper aims to prove the significant superiority of hybrid non-orthogonal multiple access (NOMA) over orthog onal multiple access (OMA) in terms of energy efficiency. In particular, a novel hybrid NOMA scheme is proposed in which a user can transmit signals not only by using its own time slot but also by using the time slots of other users. The data rate maximization problem is studied by optimizing the power allocation, where closed-form solutions are obtained. Further more, the conditions under which hybrid NOMA can achieve a higher instantaneous data rate with less power consumption than OMA are obtained. It is proved that the probability that hybrid NOMA can achieve a higher instantaneous data rate with less power consumption than OMA approaches one in the high SNR regime, indicating the superiority of hybrid NOMA in terms of power efficiency. Numerical results are also provided to verify the developed analysis and also to demonstrate the superior performance of hybrid NOMA.

翻译：本文旨在证明混合非正交多址接入（NOMA）在能效方面显著优于正交多址接入（OMA）。具体而言，我们提出了一种新型混合NOMA方案，其中用户不仅可以使用自身时隙，还可以利用其他用户的时隙进行信号传输。通过优化功率分配研究了数据速率最大化问题，并获得了闭式解。此外，本文推导出混合NOMA能以低于OMA的功耗实现更高瞬时数据速率的条件。理论证明，在高信噪比条件下，混合NOMA以更低功耗实现更高瞬时数据速率的概率趋近于1，这证实了混合NOMA在功率效率方面的优越性。数值仿真结果验证了理论分析，并进一步展示了混合NOMA的卓越性能。