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Open AccessArticle

Joint User Pairing, Channel Assignment and Power Allocation in NOMA based CR Systems

1
Department of Electrical and Computer Engineering, COMSATS University Islamabad, Islamabad 44000, Pakistan
2
School of Computer Science and Educational Software, Guangzhou University, Guangzhou 510006, China
3
School of Information Science and Engineering, Shandong University, Qingdao 266237, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(20), 4282; https://doi.org/10.3390/app9204282
Received: 22 August 2019 / Revised: 1 October 2019 / Accepted: 2 October 2019 / Published: 12 October 2019
(This article belongs to the Section Electrical, Electronics and Communications Engineering)
The fifth generation (5G) wireless communication systems promise to provide massive connectivity over the limited available spectrum. Various new transmission paradigms such as non-orthogonal multiple access (NOMA) and cognitive radio (CR) have emerged as potential 5G enabling technologies. These techniques offer high spectral efficiency by allowing multiple users to communicate on the same frequency channel, simultaneously. A combination of both techniques may further enhance the performance of the system. This work aims to maximize the achievable rate of a multi-user multi-channel NOMA based CR system. We propose an efficient user pairing, channel assignment and power optimization technique for the secondary users while the performance of primary users is guaranteed through interference temperature limits. The results show that, at small values of the power budget or high interference threshold, optimizing channel allocation and user pairing proves to be more beneficial than optimal power allocation to the user pairs. The proposed joint optimization technique provides promising results for all values of the power budget, interference threshold and rate requirement of the communicating users. View Full-Text
Keywords: non-orthogonal multiple access; underlay communication; cooperative communication; cognitive radio non-orthogonal multiple access; underlay communication; cooperative communication; cognitive radio
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MDPI and ACS Style

Ali, Z.; Rao, Y.; Khan, W.U.; Sidhu, G.A.S. Joint User Pairing, Channel Assignment and Power Allocation in NOMA based CR Systems. Appl. Sci. 2019, 9, 4282.

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