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Talk · Asilomar Conference on Signals, Systems and Computers · October 29, 2023

RIS-Assisted Self-Interference Mitigation for IBFD

Sultangali Arzykulov, Abdulkadir Çelik, Galymzhan Nauryzbayev, Ahmed M. Eltawil

Galymzhan Nauryzbayev
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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.

Advanced Wireless Communication TechnologiesFull-Duplex Wireless CommunicationsAdvanced Antenna and Metasurface Technologiesin-band full-duplexself-interference suppressionreconfigurable intelligent surface

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