Simultaneously Transmitting and Reflecting (STAR)-RISs: A Coupled Phase-Shift Model

Liu Y, Mu X, Schober R, Poor HV (2022)

Publication Type: Conference contribution

Publication year: 2022

Journal

2012 IEEE International Conference on Communications (ICC) Institute of Electrical and Electronics Engineers (IEEE)

Publisher: Institute of Electrical and Electronics Engineers Inc.

Book Volume: 2022-May

Pages Range: 2840-2845

Conference Proceedings Title: IEEE International Conference on Communications

Event location: Seoul KR

ISBN: 9781538683477

DOI: 10.1109/ICC45855.2022.9838767

Abstract

A simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) aided communication system is investigated, where an access point sends information to two users located on each side of the STAR-RIS. Different from current works assuming that the phase-shift coefficients for transmission and reflection can be independently adjusted, which is non-trivial to realize for purely passive STAR-RISs, a coupled transmission and reflection phase-shift model is considered. Based on this model, a power consumption minimization problem is formulated for both non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA). In particular, the amplitude and phase-shift coefficients for transmission and reflection are jointly optimized, subject to the rate constraints of the users. To solve this non-convex problem, an efficient element-wise alternating optimization algorithm is developed to find a high-quality suboptimal solution, whose complexity scales only linearly with the number of STAR elements. Finally, numerical results are provided for both NOMA and OMA to validate the effectiveness of the proposed algorithm by comparing its performance with that of STAR-RISs using the independent phase-shift model and conventional reflecting/transmitting-only RISs.

Authors with CRIS profile

Robert Schober Lehrstuhl für Digitale Übertragung (IDC)

Involved external institutions

Princeton University US United States (USA) (US) Queen Mary University of London GB United Kingdom (GB) Beijing University of Posts and Telecommunications (BUPT) / 北京邮电大学 CN China (CN)

How to cite

APA:

Liu, Y., Mu, X., Schober, R., & Poor, H.V. (2022). Simultaneously Transmitting and Reflecting (STAR)-RISs: A Coupled Phase-Shift Model. In IEEE International Conference on Communications (pp. 2840-2845). Seoul, KR: Institute of Electrical and Electronics Engineers Inc..

MLA:

Liu, Yuanwei, et al. "Simultaneously Transmitting and Reflecting (STAR)-RISs: A Coupled Phase-Shift Model." Proceedings of the 2022 IEEE International Conference on Communications, ICC 2022, Seoul Institute of Electrical and Electronics Engineers Inc., 2022. 2840-2845.

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