# Energy-Efficient Power Allocation in Uplink mmWave Massive MIMO with NOMA

## TL;DR

This paper proposes an energy-efficient power allocation scheme for uplink mmWave massive MIMO systems with NOMA, utilizing hybrid beamforming and enhanced NOMA to improve energy efficiency over traditional methods.

## Contribution

It introduces a novel power allocation algorithm and an enhanced NOMA scheme that leverage global information to boost energy efficiency in uplink mmWave massive MIMO systems.

## Key findings

- Proposed schemes outperform conventional orthogonal multiple access in energy efficiency.
- Hybrid beamforming reduces the number of RF chains at the base station.
- Enhanced NOMA exploits global information for better performance.

## Abstract

In this paper, we study the energy efficiency (EE) maximization problem for an uplink millimeter wave massive multiple-input multiple-output system with non-orthogonal multiple access (NOMA). Multiple two-user clusters are formed according to their channel correlation and gain difference, and NOMA is applied within each cluster. Then, a hybrid analog-digital beamforming scheme is designed to lower the number of radio frequency chains at the base station (BS). On this basis, we formulate a power allocation (PA) problem to maximize the EE under users' quality of service requirements. An iterative algorithm is proposed to obtain the PA. Moreover, an enhanced NOMA scheme is also proposed, by exploiting the global information at the BS. Numerical results show that the proposed NOMA schemes achieve superior EE when compared with the conventional orthogonal multiple access scheme.