Journal
IEEE SIGNAL PROCESSING LETTERS
Volume 26, Issue 10, Pages 1466-1470Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSP.2019.2934579
Keywords
Unmanned aerial vehicle (UAV); three-dimensional (3D) positioning optimization; interference channel; sum-rate maximization; power control
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Funding
- Nature Science Foundation of Southwest University of Science and Technology [18zx7142]
- Natural Science Foundation of China [61871137]
- Guangdong Province Key Area RD Program [2018B030338001]
- National Key Program of China [2018YFB1800800]
- Open Research Fund of National Mobile Communications Research Laboratory, Southeast University [2019D08]
- Sichuan Science and Technology Program [2019JDTD0019]
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This letter studies an unmanned aerial vehicle (UAV)-enabled two-user interference channel, in which two ground users send individual messages to their respective UAVs in the sky. By considering probabilistic line-of-sight (LoS) channel models, we jointly optimize the two UAVs' three-dimensional (3D) positioning locations and the two users' power control, to maximize their sum-rate throughput. Although this problem is non-convex and difficult to solve in general, we obtain the optimal solution by decoupling the positioning optimization and power control. The optimal solution shows that if the signal-to-noise-ratio (SNR) rho is high, then the two users should take turns to transmit at the maximum power in an on-off manner and each UAV is positioned exactly above the associated user. By contrast, if rho is low and/or the two users' distance D is large, then the two users should transmit simultaneously at the maximum power, and each UAV should be positioned away from the two users for interference mitigation.
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