Joint User-Subcarrier Pairing and Power Allocation for Uplink ACO-OFDM-NOMA Underwater Visible Light Communication Systems

• Published in: Journal of lightwave technology Vol. 39; no. 7; pp. 1997 - 2007
• Main Authors: Jiang, Rui, Sun, Caiming, Tang, Xinke, Zhang, Long, Wang, Hongjie, Zhang, Aidong
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Communications systems; Complexity; Data transmission; Energy consumption; Greedy algorithms; Iterative algorithms; Marine environment; Mixed integer; NOMA; Non-orthogonal multiple access (NOMA); Nonlinear programming; Nonorthogonal multiple access; OFDM; Optical attenuators; Optical communication; Optical receivers; Optical transmitters; Optimization; Orthogonal Frequency Division Multiplexing; power allocation; Power management; Resource management; Subcarriers; Underwater communication; underwater visible light communication (UVLC); Uplink; user-subcarrier pairing
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2020.3045106

Underwater visible light communication (UVLC) is a promising technique to provide high-speed data transmission in the water. Since it is quite difficult to supply power to the underwater devices in the complex and severe marine environment, energy consumption would be a main consideration in the practical deployment of UVLC system. In this article, we investigate an asymmetric clipped optical orthogonal frequency division multiplexing and non-orthogonal multiple access (ACO-OFDM-NOMA) scheme for the uplink UVLC system to realize energy saving and support massive device connectivity. A mixed integer nonlinear programming problem of jointly optimizing the user-subcarrier pairing and power allocation is formulated to maximize the system utility. To tackle this problem, we propose a low-complexity iterative algorithm to obtain an optimal solution. Simulation results verify that the proposed algorithm converges quickly, and the uplink ACO-OFDM-NOMA system using the proposed algorithm has better utility compared to the uplink ACO-OFDM-NOMA system using the greedy algorithm and the traditional uplink ACO-OFDM access (ACO-OFDMA) system.