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IJEETC 2023 Vol.12(2): 87-95
doi: 10.18178/ijeetc.12.2.87-95

Effective Relay Using Book of Beams in the NOMA Secondary Network

Hoai Trung Tran
University of Transport and Communications, Hanoi, Vietnam

Manuscript received September 11, 2022; revised October 23, 2022; accepted October 27, 2022.

Abstract—Non-Orthogonal Multiple Access (NOMA) technology is considered a strong candidate for 5G systems. The essence of this technique is to ensure that the near user can detect and subtract the far user's signal to get its signal for the detection. In addition, the system still provides enough signal strength for the far user. The article is interested in a 5G system that combines the primary and secondary networks, using an intermediate relay to support signals for the far secondary user. Several techniques involve inducing the transmit beamforming at the relay to produce the best signal at the far secondary user. Still, at the same time, it can generate the lowest interference to the primary; near secondary users and minimize its noise. These methods have some disadvantages, such as the complex optimal transmit beamforming algorithms or still not guaranteeing the smallest outage probability for the near and far users. The method proposed in this paper focuses on providing a book of beams combined with a hierarchical search algorithm to search for the productive beam faster, without complexity, and at the same time can minimize the outage probability thanks to the beamwidth that can be adjustable.
Index Terms—NOMA, beamforming, relay, multiple antenna, outage probability
Cite: Hoai Trung Tran, "Effective Relay Using Book of Beams in the NOMA Secondary Network," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 12, No. 2, pp. 87-95, March 2023. Doi: 10.18178/ijeetc.12.2.87-95

Copyright © 2023 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.