Spectral efficiency optimization for hybrid relay-reflecting intelligent surface
Nguyen, Nhan Thanh; Vu, Quang-Doanh; Lee, Kyungchun; Juntti, Markku (2021-07-09)
N. T. Nguyen, Q. -D. Vu, K. Lee and M. Juntti, "Spectral Efficiency Optimization for Hybrid Relay-Reflecting Intelligent Surface," 2021 IEEE International Conference on Communications Workshops (ICC Workshops), 2021, pp. 1-6, doi: 10.1109/ICCWorkshops50388.2021.9473487
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https://urn.fi/URN:NBN:fi-fe2022032124246
Tiivistelmä
Abstract
We propose a novel concept of hybrid relay-reflecting intelligent surface (HR-RIS), in which a single or few elements are deployed with power amplifiers (PAs) to serve as active relays, while the remaining elements only reflect the incident signals. The design and optimization of the HR-RIS is formulated in a spectral efficiency (SE) maximization problem, which is efficiently solved by the alternating optimization (AO) method. The simulation results show that a significant improvement in the SE can be attained by the proposed HR-RIS, even with a limited power budget, with respect to the conventional reconfigurable intelligent surface (RIS). In particular, the favorable design and deployment of the HR-RIS are analytically derived and numerically justified.
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