Wideband Active RISs: Architecture, Modeling, and Beamforming Design
Reconfigurable intelligent surfaces (RISs) have become a candidate for future 6G networks. The concept of active RISs has been recently proposed to overcome the multiplicative fading of RIS aided reflected links. However, due to the frequency-selective channels, the narrowband active RISs suffer fro...
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| Vydáno v: | IEEE communications letters Ročník 27; číslo 7; s. 1 |
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| Médium: | Journal Article |
| Jazyk: | angličtina |
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IEEE
01.07.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1089-7798, 1558-2558 |
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| Abstract | Reconfigurable intelligent surfaces (RISs) have become a candidate for future 6G networks. The concept of active RISs has been recently proposed to overcome the multiplicative fading of RIS aided reflected links. However, due to the frequency-selective channels, the narrowband active RISs suffer from a large performance loss in wideband scenarios. To address this issue, in this letter, we propose wideband active RISs, including their architecture, modeling, and beamforming design. Specifically, the key idea of wideband active RISs is to divide all subcarriers into several groups and the subcarriers in each group are configured by a single amplifying and phase-shift circuit. Based on this architecture, we derive the frequency-domain channel model and noise model of a wideband active RIS aided communication system. Then, we formulate a beamforming design problem for sum-rate maximization, and a joint transmit precoding and reflect beamforming algorithm is proposed to solve the problem. Simulation results verify the significant performance improvement of the proposed wideband RISs in wideband scenarios. |
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| AbstractList | Reconfigurable intelligent surfaces (RISs) have become a candidate for future 6G networks. The concept of active RISs has been recently proposed to overcome the multiplicative fading of RIS aided reflected links. However, due to the frequency-selective channels, the narrowband active RISs suffer from a large performance loss in wideband scenarios. To address this issue, in this letter, we propose wideband active RISs, including their architecture, modeling, and beamforming design. Specifically, the key idea of wideband active RISs is to divide all subcarriers into several groups and the subcarriers in each group are configured by a single amplifying and phase-shift circuit. Based on this architecture, we derive the frequency-domain channel model and noise model of a wideband active RIS aided communication system. Then, we formulate a beamforming design problem for sum-rate maximization, and a joint transmit precoding and reflect beamforming algorithm is proposed to solve the problem. Simulation results verify the significant performance improvement of the proposed wideband RISs in wideband scenarios. |
| Author | Li, Zhiyi Zhang, Zijian Zhang, Jida |
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| Cites_doi | 10.1109/TAP.2022.3187137 10.1109/TWC.2019.2922609 10.1109/ICCSPA55860.2022.10019022 10.1109/TWC.2022.3217828 10.1109/TCOMM.2022.3231893 10.1109/LCOMM.2021.3119696 10.1109/MSP.2021.3106230 10.1109/TCOMM.2021.3069860 10.1109/LWC.2020.3038434 10.1109/WCNC45663.2020.9120639 10.1109/TSP.2021.3088755 10.1109/LSP.2008.923790 |
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| References | ref13 zhang (ref3) 2022 ref15 ref14 ref11 ref2 ref1 alexandropoulos (ref10) 2020 ref8 ref7 ref9 ref4 moore (ref12) 1994 ref6 ref5 |
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| SubjectTerms | Algorithms Array signal processing Beamforming Broadband Communications systems Discrete Fourier transforms Modelling Narrowband OFDM Phase shift circuits Signal to noise ratio Subcarriers Time-domain analysis Wideband |
| Title | Wideband Active RISs: Architecture, Modeling, and Beamforming Design |
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