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Open AccessArticle

An Efficient Resource Allocation Algorithm for OFDM-Based NOMA in 5G Systems

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Department of Electrical Engineering, Hashemite University, Zarqa 13133, Jordan
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College of Engineering and Technology, American University of the Middle East, Egaila 15453, Kuwait
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Department of Electrical Engineering, Engineering University Peshawar, Peshawar 25210, Pakistan
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School of Telecommunication Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(12), 1399; https://doi.org/10.3390/electronics8121399
Received: 15 October 2019 / Revised: 15 November 2019 / Accepted: 21 November 2019 / Published: 23 November 2019
(This article belongs to the Section Microwave and Wireless Communications)
Non-orthogonal multiple access (NOMA) has become the key technology in the future 5G wireless networks. It can achieve multi-user multiplexing in the transmit power domain by allocating different power, which can effectively improve the system capacity and spectral efficiency. Aiming at the problem of high computational complexity and improving system capacity in non-orthogonal multiple access (NOMA) based on orthogonal frequency division multiple access (OFDMA) for 5G wireless cellular networks, this paper proposes an improved low complexity radio resource allocation algorithm for user grouping and power allocation optimization. The optimization model is established with the goal of maximizing system capacity. Through the step-by-step optimization idea, the complex non-convex optimization problem is decomposed into two sub-problems to be solved separately. Firstly, all users are grouped based on the greedy method, and then the power allocation is performed on the sub-carriers of the fixed group. Simulation results show that the proposed algorithm has better system capacity than the existing state-of-the-art algorithms and reduced complexity performance.
Keywords: 5G; NOMA; OFDMA; optimization; algorithms. 5G; NOMA; OFDMA; optimization; algorithms.
MDPI and ACS Style

Saraereh, O.A.; Alsaraira, A.; Khan, I.; Uthansakul, P. An Efficient Resource Allocation Algorithm for OFDM-Based NOMA in 5G Systems. Electronics 2019, 8, 1399.

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