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• W3169698566 abstract "In this paper, we propose a time-efficient data collection scheme, in which multiple ground devices upload their data to the unmanned aerial vehicle (UAV) via uplink nonorthogonal multiple access (NOMA). The total flight time of the UAV is equally divided into N time slots. The duration of each time slot is minimized by jointly optimizing the straight-line trajectory, device scheduling, and transmit power. To solve this mixed integer non-convex optimization problem, we decompose it into two steps. In the first step, we study the device scheduling strategy based on the UAV trajectory and the channel gains between the UAV and ground devices, through which the original problem can be greatly simplified. In the second step, the duration of each time slot is minimized by optimizing the transmit power and the UAV trajectory. An iterative algorithm based on alternating optimization is proposed, where each subproblem can be alternatively solved by applying successive convex approximation with the device scheduling updated at the end of each iteration. Numerical results are presented to evaluate the effectiveness of the proposed scheme." @default.
• W3169698566 created "2021-06-22" @default.
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• W3169698566 date "2021-03-29" @default.
• W3169698566 modified "2023-09-23" @default.
• W3169698566 title "Time-Efficient Uplink Data Collection for UAV-assisted NOMA networks" @default.
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• W3169698566 doi "https://doi.org/10.1109/wcnc49053.2021.9417543" @default.
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