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Hybrid Offline-Online Design for Reconfigurable Intelligent Surface Aided UAV Communication
- Source :
- IEEE Communications Letters. 27:1372-1376
- Publication Year :
- 2023
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2023.
-
Abstract
- This letter considers the reconfigurable intelligent surface (RIS)-aided unmanned aerial vehicle (UAV) communication systems in urban areas under the general Rician fading channel. A hybrid offline-online design is proposed to improve the system performance by leveraging both the statistical channel state information (S-CSI) and instantaneous channel state information (I-CSI). For the offline phase, we aim to maximize the expected average achievable rate based on the S-CSI by jointly optimizing the RIS's phase-shift and UAV trajectory. The formulated stochastic optimization problem is difficult to solve due to its non-convexity. To tackle this problem, we propose an efficient algorithm by leveraging the stochastic successive convex approximation (SSCA) techniques. For the online phase, the UAV adaptively adjusts the transmit beamforming and user scheduling according to the effective I-CSI. Numerical results verify that the proposed hybrid design performs better than various bechmark schemes, and also demonstrate a favorable trade-off between system performance and CSI overhead.
- Subjects :
- Signal Processing (eess.SP)
Modeling and Simulation
FOS: Electrical engineering, electronic engineering, information engineering
Data_CODINGANDINFORMATIONTHEORY
Systems and Control (eess.SY)
Electrical Engineering and Systems Science - Signal Processing
Electrical and Electronic Engineering
Electrical Engineering and Systems Science - Systems and Control
Computer Science::Information Theory
Computer Science Applications
Subjects
Details
- ISSN :
- 23737891 and 10897798
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- IEEE Communications Letters
- Accession number :
- edsair.doi.dedup.....a7b7c25068dc7a570e6020e75f89235e