Multiuser Scheduling for Asymmetric FSO/RF Links in Satellite-UAV-Terrestrial Networks

Abstract
This letter investigates the multiuser downlink transmission performance of an asymmetric free space optical (FSO)/radio frequency (RF) link. Here, the satellite delivers signal to the unmanned aerial vehicle (UAV) through a FSO link subject to Gamma-Gamma distributed turbulence, while the UAV forwards the decoded signal to multiple users through RF links characterzied by the correlated Rayleigh fading channel. By adopting that the selective decode-and-forward (DF) protocol at the UAV, we derive a closed-form expression for ergodic capacity (EC) of the considered system, where the RF link exploits transmit beamforming (BF) based on statistical channel state information (CSI) to obtain better performance than single antenna scenarios in existing works. Then, with the help of the derived EC and the available statistical CSI, a novel proportional fair scheduling (PFS) scheme is proposed. Finally, numerical results are conducted to verify the correctness of the theoretical analysis and the superiorty of the proposed scheduling scheme.

Citation
Kong, H., Lin, M., Zhu, W.-P., Amindavar, H., & Alouini, M.-S. (2020). Multiuser Scheduling for Asymmetric FSO/RF Links in Satellite-UAV-Terrestrial Networks. IEEE Wireless Communications Letters, 1–1. doi:10.1109/lwc.2020.2986750

Acknowledgements
This work is supported by the Key International Cooperation Research Project under Grant 61720106003, and Postgraduate Research & Practice Innovation Program of Jiangsu Province under Grant KYCX 0950.

Publisher
Institute of Electrical and Electronics Engineers (IEEE)

Journal
IEEE Wireless Communications Letters

DOI
10.1109/LWC.2020.2986750

Additional Links
https://ieeexplore.ieee.org/document/9062335/https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9062335

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