Millimeter-Wave Full-Duplex UAV Relay: Joint Positioning, Beamforming, and Power Control

Zhu L, Zhang J, Xiao Z, Cao X, Xia XG, Schober R (2020)

Publication Type: Journal article

Publication year: 2020

Journal

IEEE Journal on Selected Areas in Communications Institute of Electrical and Electronics Engineers (IEEE)

DOI: 10.1109/JSAC.2020.3000879

Abstract

In this paper, a full-duplex unmanned aerial vehicle (FD-UAV) relay is employed to increase the communication capacity of millimeter-wave (mmWave) networks. Large antenna arrays are equipped at the source node (SN), destination node (DN), and FD-UAV relay to overcome the high path loss of mmWave channels and to help mitigate the self-interference at the FD-UAV relay. Specifically, we formulate a problem for maximization of the achievable rate from the SN to the DN, where the UAV position, analog beamforming, and power control are jointly optimized. Since the problem is highly non-convex and involves high-dimensional, highly coupled variable vectors, we first obtain the conditional optimal position of the FDUAV relay for maximization of an approximate upper bound on the achievable rate in closed form, under the assumption of a line-of-sight (LoS) environment and ideal beamforming. Then, the UAV is deployed to the position which is closest to the conditional optimal position and yields LoS paths for both air-to-ground links. Subsequently, we propose an alternating interference suppression (AIS) algorithm for the joint design of the beamforming vectors and the power control variables. In each iteration, the beamforming vectors are optimized for maximization of the beamforming gains of the target signals and the successive reduction of the interference, where the optimal power control variables are obtained in closed form. Our simulation results confirm the superiority of the proposed positioning, beamforming, and power control method compared to three benchmark schemes. Furthermore, our results show that the proposed solution closely approaches a performance upper bound for mmWave FD-UAV systems.

Authors with CRIS profile

Robert Schober Lehrstuhl für Digitale Übertragung

Involved external institutions

Beihang University, Beijing University of Aeronautics and Astronautics (BUAA) / 北京航空航天大学 CN China (CN) Beijing Institute of Technology (BIT) / 北京理工大学 CN China (CN) University of Delaware (UDEL) US United States (USA) (US)

How to cite

APA:

Zhu, L., Zhang, J., Xiao, Z., Cao, X., Xia, X.G., & Schober, R. (2020). Millimeter-Wave Full-Duplex UAV Relay: Joint Positioning, Beamforming, and Power Control. IEEE Journal on Selected Areas in Communications. https://dx.doi.org/10.1109/JSAC.2020.3000879

MLA:

Zhu, Lipeng, et al. "Millimeter-Wave Full-Duplex UAV Relay: Joint Positioning, Beamforming, and Power Control." IEEE Journal on Selected Areas in Communications (2020).

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