Resource Allocation and 3D Trajectory Design for Power-Efficient IRS-Assisted UAV-NOMA Communications

Cai Y, Wei Z, Hu S, Liu C, Ng DWK, Yuan J (2022)

Publication Type: Journal article

Publication year: 2022

Journal

IEEE Transactions on Wireless Communications Institute of Electrical and Electronics Engineers (IEEE)

Book Volume: 21

Pages Range: 10315-10334

Journal Issue: 12

DOI: 10.1109/TWC.2022.3183300

Abstract

In this paper, an intelligent reflecting surface (IRS) is introduced to assist an unmanned aerial vehicle (UAV) communication system based on non-orthogonal multiple access (NOMA) for serving multiple ground users. We aim to minimize the average total system energy consumption by jointly designing the resource allocation strategy, the three dimensional (3D) trajectory of the UAV, as well as the phase control at the IRS. The design is formulated as a non-convex optimization problem taking into account the maximum tolerable outage probability constraint and the individual minimum data rate requirement. To circumvent the intractability of the design problem due to the altitude-dependent Rician fading in UAV-to-user links, we adopt the deep neural network (DNN) approach to accurately approximate the corresponding effective channel gains, which facilitates the development of a low-complexity suboptimal iterative algorithm via dividing the formulated problem into two subproblems and address them alternatingly. Numerical results demonstrate that the proposed algorithm can converge to an effective solution within a small number of iterations and illustrate some interesting insights: (1) IRS enables a highly flexible UAV's 3D trajectory design via recycling the dissipated radio signal for improving the achievable system data rate and reducing the flight power consumption of the UAV; (2) IRS provides a rich array gain through passive beamforming in the reflection link, which can substantially reduce the required communication power for guaranteeing the required quality-of-service (QoS); (3) Optimizing the altitude of UAV's trajectory can effectively exploit the outage-guaranteed effective channel gain to save the total required communication power enabling power-efficient UAV communications; (4) NOMA communications offer higher degrees of freedom (DoF) than that of the conventional orthogonal multiple access (OMA) scheme to minimize the average power consumption via optimizing the UAV's trajectory.

Authors with CRIS profile

Zhiqiang Wei Lehrstuhl für Digitale Übertragung (IDC)

Involved external institutions

Beijing Information Science & Technology University (BISTU) / 北京信息科技大学

China (CN) University of New South Wales (UNSW)

Australia (AU)

How to cite

APA:

Cai, Y., Wei, Z., Hu, S., Liu, C., Ng, D.W.K., & Yuan, J. (2022). Resource Allocation and 3D Trajectory Design for Power-Efficient IRS-Assisted UAV-NOMA Communications. IEEE Transactions on Wireless Communications, 21(12), 10315-10334. https://doi.org/10.1109/TWC.2022.3183300

MLA:

Cai, Yuanxin, et al. "Resource Allocation and 3D Trajectory Design for Power-Efficient IRS-Assisted UAV-NOMA Communications." IEEE Transactions on Wireless Communications 21.12 (2022): 10315-10334.

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