Energy Efficiency Maximization in NOMA Enabled Backscatter Communications With QoS Guarantee

• Published in: IEEE wireless communications letters Vol. 10; no. 2; pp. 353 - 357
• Main Authors: Xu, Yongjun, Qin, Zhijin, Gui, Guan, Gacanin, Haris, Sari, Hikmet, Adachi, Fumiyuki
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.02.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Backscatter; Backscatter communications; Backscattering; Communication networks; Communications systems; Energy efficiency; Interference; Iterative algorithms; NOMA; non-orthogonal multiple access; Nonorthogonal multiple access; Quality of service; Quality of service architectures; Reflectance; Resource allocation; Resource management; Signal to noise ratio; Telecommunications; User requirements
• ISSN: 2162-2337; 2162-2345
• DOI: 10.1109/LWC.2020.3031042

Energy efficiency (EE) is an important performance metric in communication systems. However, to the best of our knowledge, the energy-efficient resource allocation (RA) problem in non-orthogonal multiple access enabled backscatter communication networks (NOMA-BackComNet) comprehensively considering the user's quality of service (QoS) has not been investigated. In this letter, we present the first attempt to solve the EE-based RA problem for NOMA-BackComNet with QoS guarantee. The objective is to maximize the EE of users subject to the QoS requirements of users, the decoding order of successive interference cancellation and the reflection coefficient (RC) constraint, where the transmit power of the base station and the RC of the backscatter device are jointly optimized. To solve this non-convex problem, we develop a novel iteration algorithm by using Dinkelbach's method and the quadratic transformation approach. Simulation results verify the effectiveness of the proposed scheme in improving the EE by comparing it with the other schemes.