A UAV and a reconfigurable intelligent surface can be jointly optimized, with a closed-form phase alignment and a successive-convex-approximation trajectory design, to raise the average downlink rate above trajectory-only or surface-only benchmarks.
Reconfigurable Intelligent Surfaces vs. Relaying: Differences, Similarities, and Performance Comparison
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abstract
Reconfigurable intelligent surfaces (RISs) have the potential of realizing the emerging concept of smart radio environments by leveraging the unique properties of meta-surfaces. In this article, we discuss the potential applications of RISs in wireless networks that operate at high-frequency bands, e.g., millimeter wave (30-100 GHz) and sub-millimeter wave (greater than 100 GHz) frequencies. When used in wireless networks, RISs may operate in a manner similar to relays. This paper elaborates on the key differences and similarities between RISs that are configured to operate as anomalous reflectors and relays. In particular, we illustrate numerical results that highlight the spectral efficiency gains of RISs when their size is sufficiently large as compared with the wavelength of the radio waves. In addition, we discuss key open issues that need to be addressed for unlocking the potential benefits of RISs.
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2019 1verdicts
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Reconfigurable Intelligent Surface Assisted UAV Communication: Joint Trajectory Design and Passive Beamforming
A UAV and a reconfigurable intelligent surface can be jointly optimized, with a closed-form phase alignment and a successive-convex-approximation trajectory design, to raise the average downlink rate above trajectory-only or surface-only benchmarks.