On Energy Efficiency of Hybrid NOMA

TL;DR

This paper demonstrates that hybrid NOMA significantly outperforms traditional OMA in energy efficiency by allowing users to transmit across multiple time slots, with analytical proofs and numerical validation confirming its advantages in high SNR conditions.

Contribution

A novel hybrid NOMA scheme is proposed, with analytical solutions for power allocation and conditions for superior energy efficiency over OMA.

Findings

Hybrid NOMA achieves higher instantaneous data rates with less power in high SNR.

Probability of hybrid NOMA outperforming OMA approaches one at high SNR.

Numerical results confirm the theoretical advantages of hybrid NOMA.

Abstract

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.