Hybrid RIS Aided Wireless Communications
Nguyen, Nhan Thanh; Juntti, Markku (2026-02-03)
IEEE
03.02.2026
N. T. Nguyen and M. Juntti, "Hybrid RIS Aided Wireless Communications," 2025 International Symposium on Antennas and Propagation (ISAP), Fukuoka, Japan, 2025, pp. 1-2, doi: 10.23919/ISAP63122.2025.11361681
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© 2026 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists,or reuse of any copyrighted component of this work in other works.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202604282827
https://urn.fi/URN:NBN:fi:oulu-202604282827
Tiivistelmä
Abstract
In the conventional reconfigurable intelligent surfaces (RISs), the purely passive reflection not only limits the beamforming gains but also hinders the acquisition of accurate channel state information. In this paper, we provide an overview of a hybrid active-passive RIS (HRIS) architecture, in which only a few elements are active to provide signal amplification gains. The introduction of a small number of active elements enables a remarkable system performance improvement which can also compensate for losses due to hardware impairments such as the deployment of limited-resolution phase shifters. We present two practical architectures for HRISs, namely, fixed and dynamic HRISs. Numerical results show that HRISs with only four active elements can attain up to 42.8% and 41.8% improvement in spectral efficiency and energy efficiency, respectively, compared with conventional RISs.
In the conventional reconfigurable intelligent surfaces (RISs), the purely passive reflection not only limits the beamforming gains but also hinders the acquisition of accurate channel state information. In this paper, we provide an overview of a hybrid active-passive RIS (HRIS) architecture, in which only a few elements are active to provide signal amplification gains. The introduction of a small number of active elements enables a remarkable system performance improvement which can also compensate for losses due to hardware impairments such as the deployment of limited-resolution phase shifters. We present two practical architectures for HRISs, namely, fixed and dynamic HRISs. Numerical results show that HRISs with only four active elements can attain up to 42.8% and 41.8% improvement in spectral efficiency and energy efficiency, respectively, compared with conventional RISs.
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