RIS-assisted Integrated Sensing and Communications: A Subspace Rotation Approach: Invited Paper

Meng, X and Liu, F and Lu, S and Chepuri, SP and Masouros, C (2023) RIS-assisted Integrated Sensing and Communications: A Subspace Rotation Approach: Invited Paper. In: 2023 IEEE Radar Conference, RadarConf23, 1 - 5 May 2023, San Antonia.

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Abstract

In this paper, we propose a novel joint active and passive beamforming approach for integrated sensing and communication (ISAC) transmission with assistance of reconfigurable intelligent surfaces (RISs) to simultaneously detect a target and communicate with a communication user. We first show that the sensing and communication (S&C) performance can be jointly improved due to the capability of the RISs to control the ISAC channel. In particular, we show that RISs can favourably enhance both the channel gain and the coupling degree of S&C channels by modifying the underlying subspaces. In light of this, we develop a heuristic algorithm that expands and rotates the S&C subspaces that is able to attain significantly improved ISAC performance. To verify the effectiveness of the subspace rotation scheme, we further provide a benchmark scheme which maximizes the signal-to-noise ratio (SNR) at the sensing receiver while guaranteeing the SNR at the communication user. Finally, numerical simulations are provided to validate the proposed approaches.

Item Type:	Conference Paper
Publication:	Proceedings of the IEEE Radar Conference
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	beamforming; ISAC; RIS; subspace.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	24 Jul 2023 12:27
Last Modified:	24 Jul 2023 12:27
URI:	https://eprints.iisc.ac.in/id/eprint/82629

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