Reconfigurable Intelligent Surfaces for Real-World Wireless Communication

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".

Deadline for manuscript submissions: 16 November 2024 | Viewed by 3415

Special Issue Editor


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Guest Editor
Department of Information and Communication Engineering, Kongju National University; Cheonan 31080, Republic of Korea
Interests: electromagnetic periodic structure applications; metausrface; frequency selective surface
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Special Issue Information

Dear Colleagues,

Since the beginning of the study of reconfigurable including metasurface structures, there has been a lot of research on RISs (reconfigurable intelligent surfaces) to utilize them for wireless communication. RIS research initially started with IRSs (intelligent reflecting surfaces), which centered on reflection characteristics, and recently expanded to IOSs (intelligent omni surfaces), which have both transmission and reception characteristics. RISs are used in 5G or 6G mobile wireless communication environments to overcome communication performance degradation in shaded areas, especially in indoor propagation environments. Despite all the research being conducted on RISs, there still exist several technical issues. For example, how to sense and estimate the channel state information, how to accurately model the EM characteristics of RISs in the channel, how to implement cost-effective and controllable RISs, how to implement the proposed active RISs to overcome multiplicative fading in RIS channels, and how to efficiently implement the RIS control board, all remains contentious issues.

In this Special Issue, we will cover a variety of research findings for implementation in real-world wireless environments to address the technical challenges of RISs.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Hardware implementation of RISs;
  • Implementing RISs with sensing and control;
  • Active or hybrid RIS structure;
  • Measurement system of RISs;
  • Wideband or multifunctional RISs;
  • Transparent RISs;
  • Codebook implementation of RISs;
  • Power-saving or -harvesting RISs.

I look forward to receiving your contributions.

Prof. Dr. Ic-Pyo Hong
Guest Editor

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Keywords

  • reconfigurable intelligent surfaces
  • intelligent reflecting surfaces
  • intelligent omni surfaces
  • reconfigurable/programmable metasurfaces

Published Papers (2 papers)

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17 pages, 663 KiB  
Article
Enhancing Throughput in IoT Networks: The Impact of Active RIS on Wireless Powered Communication Systems
by Iqra Hameed and Insoo Koo
Electronics 2024, 13(7), 1402; https://doi.org/10.3390/electronics13071402 - 08 Apr 2024
Viewed by 453
Abstract
This paper investigates the potential of active reconfigurable intelligent surfaces (RIS) to enhance wireless-powered communication networks (WPCNs), addressing the evolving connectivity needs of the internet of things (IoT). Active RIS, capable of amplifying and reflecting signals, offers a solution to surpass the limitations [...] Read more.
This paper investigates the potential of active reconfigurable intelligent surfaces (RIS) to enhance wireless-powered communication networks (WPCNs), addressing the evolving connectivity needs of the internet of things (IoT). Active RIS, capable of amplifying and reflecting signals, offers a solution to surpass the limitations of passive RIS, such as double-fading attenuation, aiming to significantly improve network throughput and coverage. Our research focuses on exploiting the amplification capabilities of active RIS to boost the overall network sum throughput, engaging in a comprehensive optimization of critical network parameters, including time allocation, reflection coefficients, and phase shift matrices specific to active RIS. The formulated problem is non-convex and highly complex due to the coupling of optimization variables. We employed a successive convex approximation algorithm to solve the throughput maximization problem by converting the non-convex constraints into approximated convex constraints and solving them iteratively. Through extensive simulations, we demonstrate that our active RIS-assisted network substantially outperforms networks facilitated by passive RIS, marking a significant advancement in WPCN performance. These findings underscore the potential of active RIS technology in realizing the full capabilities of IoT connectivity. Full article
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Review

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48 pages, 31408 KiB  
Review
Reviews Based on the Reconfigurable Intelligent Surface Technical Issues
by Ic-Pyo Hong
Electronics 2023, 12(21), 4489; https://doi.org/10.3390/electronics12214489 - 01 Nov 2023
Cited by 2 | Viewed by 2534
Abstract
Reconfigurable intelligent surfaces (RISs) are programmable metasurface structures that can control the propagation of electromagnetic waves by changing the electrical and magnetic properties of the surface. They can be used to intelligently reconfigure the wireless environment to improve the capacity and coverage of [...] Read more.
Reconfigurable intelligent surfaces (RISs) are programmable metasurface structures that can control the propagation of electromagnetic waves by changing the electrical and magnetic properties of the surface. They can be used to intelligently reconfigure the wireless environment to improve the capacity and coverage of wireless networks. In recent years, numerous theoretical innovations and prototype tests have demonstrated that the RIS has the advantages of low cost, low power consumption, and easy deployment, and creates many potential opportunities and broad application prospects in 5G and future 6G networks. In this paper, starting from the technological development of RISs, we discussed the technical issues of RISs. The standardization of RISs, types of RISs according to operation modes, channel modeling, considerations for hardware implementation, differences from existing communication modules and the need for active RIS implementation, noise and power characteristics to ensure the efficiency of RISs, and performance parameters of RISs and field test results of RISs in indoor and outdoor environments were reviewed. By resolving the current technical issues of RISs, it is expected that RISs will be successfully used for B5G/6G communication through commercialization. Full article
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