University of Oulu

J. Kokkoniemi, "Analysis of Received Power via RIS in Near Field LOS Channels," 2023 IEEE 17th International Symposium on Medical Information and Communication Technology (ISMICT), Lincoln, NE, USA, 2023, pp. 1-6, doi: 10.1109/ISMICT58261.2023.10152132

Analysis of received power via RIS in near field LOS channels

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Author: Kokkoniemi, Joonas1
Organizations: 1Centre for Wireless Communications (CWC), University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2023
Publish Date: 2023-08-23


The reconfigurable intelligent surfaces (RISs) are expected to be a cheap way to extend service areas of base stations. This is especially promising in the millimeter wave and THz bands (from 30 GHz to +300 GHz) where base station coverage is expected to be modest and suffer greatly from blockages. As the RISs can potentially be large (physically and via number of sub-elements), there is a good change that a user is in the near field of the RIS. This paper considers RIS near field propagation and achievable power levels close to these surfaces. Ideal energy levels are looked into among with the impact of beamforming and beam squinting. Human safety issues close to these surfaces are also analyzed from the energy density point of view. It is shown that the achievable received power in the near field are very good, but the beam squinting may have a significant impact on the received power and frequency response. We also conclude that RISs are safe for humans even at close proximity due to relatively large channel losses in the reflected channels and hence low power densities in the air.

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Series: International Symposium on Medical Information and Communication Technology
ISSN: 2326-828X
ISSN-E: 2326-8301
ISSN-L: 2326-828X
ISBN: 979-8-3503-0417-6
ISBN Print: 979-8-3503-0418-3
DOI: 10.1109/ISMICT58261.2023.10152132
Host publication: 2023 IEEE 17th International Symposium on Medical Information and Communication Technology (ISMICT), 10-12 May 2023
Conference: International Symposium on Medical Information and Communication Technology
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the Horizon 2020, European Union's Framework Programme for Research and Innovation, under grant agreement no. 871464 (ARIADNE). It was also supported by the Academy of Finland 6Genesis Flagship program under Grant no. 346208. On top of these, the trip to the ISMICT’ 2023 conference and the related research visit to University of Nebraska-Lincoln were further supported by the European Union's Horizon 2020 programme under the Marie Sklodowska-Curie grant agreement no. 872752 (ROVER) and Finnish-American Innovation Accelerator FARIA.
EU Grant Number: (871464) ARIADNE - Artificial Intelligence Aided D-band Network for 5G Long Term Evolution
Academy of Finland Grant Number: 346208
Detailed Information: 346208 (Academy of Finland Funding decision)
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