RIS-aided OTFS Modulation in High-Doppler Channels

c, G and Bhat, VS and Chockalingam, A (2022) RIS-aided OTFS Modulation in High-Doppler Channels. In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, 12 - 15 September 2022, Virtual, Online, pp. 409-415.

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Abstract

Two research topics, namely, reconfigurable intelligent surfaces (RIS) and orthogonal time frequency space (OTFS) modulation, have drawn significant interest in recent wireless research. While RIS technology can aid communication by favorably controlling the electromagnetic wave propagation towards the receiver, OTFS modulation can offer robust performance in high-Doppler channels. Both RIS and OTFS are envisioned to be promising technologies for 6G and beyond. This paper investigates a RIS-aided OTFS system. A novel and useful contribution in this paper is the detailed derivation of the end-to-end delay-Doppler (DD) domain input-output relation of a RIS-aided OTFS system, which can serve as a basic system model that can aid the investigation of efficient transceiver techniques/algorithms, performance evaluation, and implementation. We consider maximization of the Frobenius norm of the effective end-to-end DD channel matrix of the RIS-aided OTFS system to choose the phase vector at the RIS. Our simulation results show that RIS-aided OTFS performs significantly better compared to RIS-aided OFDM.

Item Type:	Conference Paper
Publication:	IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
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:	Interlocking signals; Radio transceivers, Delay-dopple domain; Doppler; Input-output relations; Orthogonal time frequency space modulation; Reconfigurable; Reconfigurable intelligent surface; Reconfigurable intelligent surface-aided OFDM; Reconfigurable intelligent surface-aided orthogonal time frequency space; Time-frequency space, Orthogonal frequency division multiplexing
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	01 Feb 2023 05:02
Last Modified:	01 Feb 2023 05:02
URI:	https://eprints.iisc.ac.in/id/eprint/79639

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