Active RISs: Signal Modeling, Asymptotic Analysis, and Beamforming Design
Zhang Z, Dai L, Chen X, Liu C, Yang F, Schober R, Poor HV (2022)
Publication Type: Conference contribution
Publication year: 2022
Publisher: Institute of Electrical and Electronics Engineers Inc.
Pages Range: 1618-1624
Conference Proceedings Title: 2022 IEEE Global Communications Conference, GLOBECOM 2022 - Proceedings
Event location: Virtual, Online, BRA
ISBN: 9781665435406
DOI: 10.1109/GLOBECOM48099.2022.10001687
Abstract
Reconfigurable intelligent surfaces (RISs) have emerged as a candidate technology for future 6G networks. However, due to the 'multiplicative fading' effect, the existing passive RISs only achieve a negligible capacity gain in environments with strong direct links. In this paper, the concept of active RISs is studied to overcome this fundamental limitation. Unlike the existing passive RISs that reflect signals without amplification, active RISs can amplify the reflected signals via amplifiers integrated into their elements. To characterize the signal amplification and incorporate the noise introduced by the active components, we verify the signal model of active RISs through the experimental measurements on a fabricated active RIS element. Based on the verified signal model, we formulate the sum-rate maximization problem for an active RIS aided multi-user multiple-input single-output (MU-MISO) system and a joint transmit precoding and reflect beamforming algorithm is proposed to solve this problem. Simulation results show that, in a typical wireless system, the existing passive RISs can realize only a negligible sum-rate gain of 3%, while the active RISs can achieve a significant sum-rate gain of 62%, thus over coming the 'multiplicative fading' effect. Finally, we develop a 64-element active RIS aided wireless communication prototype, and the significant gain of active RISs is validated by field test.
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China (CN)
United States (USA) (US)How to cite
APA:
Zhang, Z., Dai, L., Chen, X., Liu, C., Yang, F., Schober, R., & Poor, H.V. (2022). Active RISs: Signal Modeling, Asymptotic Analysis, and Beamforming Design. In 2022 IEEE Global Communications Conference, GLOBECOM 2022 - Proceedings (pp. 1618-1624). Virtual, Online, BRA: Institute of Electrical and Electronics Engineers Inc..
MLA:
Zhang, Zijian, et al. "Active RISs: Signal Modeling, Asymptotic Analysis, and Beamforming Design." Proceedings of the 2022 IEEE Global Communications Conference, GLOBECOM 2022, Virtual, Online, BRA Institute of Electrical and Electronics Engineers Inc., 2022. 1618-1624.
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