# Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges

“Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges” (2016), by S. M. Riazul Islam et al. Engineering research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: S. M. Riazul Islam, Nurilla Avazov, Octavia A. Dobre, Kyung-sup Kwak
- Published: October 25, 2016
- Field: Engineering
- DOI: https://doi.org/10.1109/comst.2016.2621116
- Free PDF: https://arxiv.org/pdf/1609.06261

## Abstract

Non-orthogonal multiple access (NOMA) is one of the promising radio access techniques for performance enhancement in next-generation cellular communications. Compared to orthogonal frequency division multiple access, which is a well-known high-capacity orthogonal multiple access technique, NOMA offers a set of desirable benefits, including greater spectrum efficiency. There are different types of NOMA techniques, including power-domain and code-domain. This paper primarily focuses on power-domain NOMA that utilizes superposition coding at the transmitter and successive interference cancellation at the receiver. Various researchers have demonstrated that NOMA can be used effectively to meet both network-level and user-experienced data rate requirements of fifth-generation (5G) technologies. From that perspective, this paper comprehensively surveys the recent progress of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power allocation strategies, user fairness, and user-pairing schemes in NOMA. In addition, this paper discusses how NOMA performs when it is integrated with various proven wireless communications techniques, such as cooperative communications, multiple-input multiple-output, beamforming, space–time coding, and network coding among others. Furthermore, this paper discusses several important issues on NOMA implementation and provides some avenues for future research.

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