University of Oulu

V. Tapio, M. Juntti, I. Hemadeh and A. Mourad, "Near-Field Beamforming at Intelligent Re-Configurable Surface in Uplink Transmission," 2021 IEEE International Conference on Communications Workshops (ICC Workshops), 2021, pp. 1-5, doi: 10.1109/ICCWorkshops50388.2021.9473882

Near-field beamforming at intelligent re-configurable surface in uplink transmission

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Author: Tapio, Visa1; Juntti, Markku1; Hemadeh, Ibrahim2;
Organizations: 1Centre for Wireless Communications (CWC), Uninvesity of Oulu, Oulu, Finland
2InterDigital Europe, Ltd London, United Kingdom
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.2 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2021-08-06


Intelligent re-configurable surfaces (IRS) constitute electronically steerable structures that can be used to control the propagation of electromagnetic (EM) waves. Owing to their passive nature in terms of signal reflection, IRS require large-scale implementations. This means that the near-field effect, e.g., the curvature of the propagating EM wave must be considered. In this paper, a simple two-step near-field beamforming method is proposed. In the first step, the direction from the IRS center point to the user equipment (UE) is found assuming plane wave model. In the second step, the transmitted beam is focused towards the UE based on the pre-calculated constant phase contours. All operations in the proposed method can be implemented as memory operations, i.e., no complex computations are needed. The operation of the method is verified with simulations. The results show that the proposed beamforming technique is capable of focusing the beam pattern of the IRS towards the user. More specifically, the near-field focusing of a (50 ×50)-element IRS operating at 5 GHz frequency increases the received power by 3 dB when compared to a case where the near-field effect is ignored.

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Series: IEEE International Conference on Communications workshop
ISSN: 2164-7038
ISSN-E: 2694-2941
ISSN-L: 2164-7038
ISBN: 978-1-7281-9441-7
ISBN Print: 978-1-7281-9442-4
Pages: 1 - 5
DOI: 10.1109/ICCWorkshops50388.2021.9473882
Host publication: 2021 IEEE International Conference on Communications (June 14-23, 2021), WS-10: Workshop on Reconfigurable Intelligent Surfaces for Future Wireless
Conference: IEEE International Conference on Communications
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research is partially funded by the Academy of Finland 6Genesis Flagship (grant 318927).
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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