Multi-Functional RIS Integrated Sensing and Communications for 6G Networks
Dongsheng Han, Peng Wang, Wanli Ni, Wen Wang, Ailing Zheng, Dusit, Niyato, Naofal Al-Dhahir

TL;DR
This paper introduces a multi-functional reconfigurable intelligent surface (MF-RIS) that enhances integrated sensing and communication systems by supporting reflection, refraction, amplification, and sensing, with optimized configurations for multi-user and multi-target scenarios.
Contribution
The paper proposes a novel MF-RIS design supporting multiple functions and develops an optimization framework for joint beamforming and RIS configuration in multi-user, multi-target ISAC systems.
Findings
MF-RIS with energy splitting protocol outperforms other RIS types.
Proposed MF-RIS achieves significant sensing SINR gains over passive and active RIS.
Sensing performance saturates beyond a certain number of sensing elements.
Abstract
In this paper, we propose a novel multi-functional reconfigurable intelligent surface (MF-RIS) that supports signal reflection, refraction, amplification, and target sensing simultaneously. Our MF-RIS aims to enhance integrated communication and sensing (ISAC) systems, particularly in multi-user and multi-target scenarios. Equipped with reflection and refraction components (i.e., amplifiers and phase shifters), MF-RIS is able to adjust the amplitude and phase shift of both communication and sensing signals on demand. Additionally, with the assistance of sensing elements, MF-RIS is capable of capturing the echo signals from multiple targets, thereby mitigating the signal attenuation typically associated with multi-hop links. We propose a MF-RIS-enabled multi-user and multi-target ISAC system, and formulate an optimization problem to maximize the signal-to-interference-plus-noise ratio…
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Taxonomy
TopicsAdvanced Wireless Communication Technologies
