University of Oulu

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

Spectral efficiency optimization for hybrid relay-reflecting intelligent surface

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Author: Nguyen, Nhan Thanh1; Vu, Quang-Doanh2; Lee, Kyungchun2;
Organizations: 1Centre for Wireless Communications, University of Oulu, P.O.Box 4500, FI-90014, Finland
2The Mobile Networks, Nokia, 90650 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.3 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2022-03-21


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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Series: IEEE Conference on Computer Communications workshops
ISSN: 2159-4228
ISSN-L: 2159-4228
ISBN: 978-1-7281-9441-7
ISBN Print: 978-1-7281-9442-4
Pages: 1 - 6
Article number: 9473487
DOI: 10.1109/ICCWorkshops50388.2021.9473487
Host publication: 2021 IEEE International Conference on Communications Workshops, ICC Workshops 2021
Conference: IEEE International Conference on Communications Workshops
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work has been supported in part by Academy of Finland under 6Genesis Flagship (grant 318927) and EERA Project (grant 332362).
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
332362 (Academy of Finland Funding decision)
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