Journal
IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 9, Issue 8, Pages 1235-1239Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2020.2986750
Keywords
Radio frequency; Signal to noise ratio; Fading channels; Satellites; Optical fiber communication; Unmanned aerial vehicles; Protocols; Satellite communication; asymmetric FSO; RF link; ergodic capacity; multiuser scheduling
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Funding
- Key International Cooperation Research Project [61720106003]
- Shanghai Aerospace Science and Technology Innovation Foundation [SAST2019-095]
- Fund Project in the Field of Basic Strengthening Plan Technology [2019-JCJQ-JJ-226]
- Postgraduate Research and Practice Innovation Program of Jiangsu Province [KYCX19_0950]
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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 superiority of the proposed scheduling scheme.
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