Date & Time: 

   2024 /09 / 27 (Fri) 14:20 - 16:20

 

Location: 

   Delta Building R216, NTHU

 

Speaker: 

    古孟霖 教授

   國立中央大學通訊工程學系

 

Topic: 

   UAV Trajectory, User Association and Power Control for Multi-UAV Enabled Energy Harvesting Communications

 

Abstract: 

   In this talk, we consider multiple solar-powered wireless nodes (WNs) which utilize the harvested solar energy to transmit collected data to multiple unmanned aerial vehicles (UAVs) in the uplink. In this context, we jointly design UAV flight trajectories, UAV-node user association, and uplink power control to effectively utilize the harvested energy and manage co-channel interference within a finite time horizon. The design goal is to ensure the fairness of WNs by maximizing the worst user rate. The joint design problem is highly nonconvex and requires causal (future) knowledge of the instantaneous energy state information (ESI) and channel state information (CSI), which are difficult to predict in reality. To overcome these challenges, we propose an offline method based on convex optimization that only utilizes the average ESI and CSI, where line-of-sight (LOS) and non-LOS (NLOS) channels are considered. The problem is solved by three convex subproblems with successive convex approximation (SCA) and alternative optimization. We further design an online convex-assisted reinforcement learning (CARL) method based on real-time environmental information. An idea of multi-UAV regulated flight corridors, based on the optimal offline UAV trajectories, is proposed to avoid unnecessary flight exploration by UAVs and enables us to improve the learning efficiency and system performance, as compared with the conventional reinforcement learning (RL) method.

 

Autobiography: 

Meng-Lin Ku (M'11-SM'20) received the B.S., M.S., and Ph.D. degrees in communication engineering from National Chiao Tung University, Hsinchu, Taiwan, in 2002, 2003, and 2009, respectively. From 2009 to 2010, he was a Postdoctoral Research Fellow with Prof. L.-C. Wang with the Department of Electrical and Computer Engineering, National Chiao Tung University, and also with Prof. V. Tarokh with the School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA. In August 2010, he became a Faculty Member of the Department of Communication Engineering, National Central University, Taoyuan, Taiwan, where he is currently a Distinguished Professor. During the summer of 2013, he was a Visiting Scholar with the Signals and Information Group of Prof. K. J. R. Liu with the University of Maryland, College Park, MD, USA. His current research interests are in the areas of green communications, terrestrial-satellite & UAV-integrated communications, and optimization and artificial intelligence for radio access. Dr. Ku was the recipient of the Exploration Research Award of the Pan Wen Yuan Foundation in 2013, the Chinese Institute of Electrical Engineering Outstanding Young Electrical Engineer Award in 2019, and the Outstanding Youth Award of Taiwan Consumer Electronics Society in 2022. He was also the recipient of IEEE PIMRC Best Track Paper Award in 2022. He was the former Chair of the IEEE Information Theory Society Taipei Chapter, and he is currently serving as Associate Editors of IEEE Transactions on Wireless Communications} and IEEE Access.