RIS-assisted self-interference mitigation for IBFD

Arzykulov, Sultangali, Celik, Abdulkadir, Nauryzbayev, Galymzhan and Eltawil, Ahmed M. (2023) RIS-assisted self-interference mitigation for IBFD. Matthews, Michael B. (ed.) In 2023 57th Asilomar Conference on Signals, Systems, and Computers. IEEE. pp. 182-187 . (doi:10.1109/IEEECONF59524.2023.10476983).

Abstract

In-band full-duplex (IBFD) technology offers a promising solution to address the demanding spectrum requirements of emerging wireless applications and use cases. Additionally, alongside the conventional reconfigurable intelligent surface (C-RIS), the simultaneously transmitting and reflecting RIS (STAR-RIS) is a promising technology that enables full-space coverage on both sides of the surface by dividing the incident signal into transmitted and reflected signals. Pairing FD with RIS technology creates new possibilities to achieve self-interference (SI) cancellation and spectral efficiency that were previously unattainable. This paper presents a novel approach leveraging C-RIS and STAR-RIS technologies in the IBFD network. Our methodology uses the C-RIS to improve SI mitigation at the FD transceiver, while the STAR-RIS serves as a connectivity enhancer for UL and DL transmissions. To fully leverage these capabilities, we propose a joint C-RIS and STAR-RIS problem, which entails optimizing the number of elements in the C-RIS to cancel out SI. At the same time, we use numerical and closed-form solutions to optimize STAR-RIS partitioning and reflection coefficient control for optimal DL and UL transmission performance in STAR-RIS's transmission and reflection modes.

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Contributors

Author: Abdulkadir Celik

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