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Integrated Sensing and Communications With MIMO-OTFS: ISI/ICI Exploitation and Delay-Doppler Multiplexing

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Integrated_Sensing_and_Communications_With_MIMO-OTFS_ISI_ICI_Exploitation_and_Delay-Doppler_Multiplexing_author.pdf (2.822Mb)
Identifiers
URI: https://hdl.handle.net/20.500.12761/1887
DOI: 10.1109/TWC.2024.3370501
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Author(s)
Keskin, Musa Furkan; Marcus, Carina; Henricsson, Olof; Alvarado, Alvaro; Widmer, Joerg; Wymeersch, Henk
Date
2024-03
Abstract
Orthogonal time frequency space (OTFS) is a promising alternative to orthogonal frequency-division multiplexing (OFDM) for high-mobility communications. We propose a novel multiple-input multiple-output (MIMO) integrated sensing and communication (ISAC) system based on OTFS modulation. We begin by deriving new sensing and communication signal models for the proposed MIMO-OTFS ISAC system that explicitly capture inter-symbol interference (ISI) and inter-carrier interference (ICI) effects. We then develop a generalized likelihood ratio test (GLRT) based multi-target detection and delay-Doppler-angle estimation algorithm for MIMO-OTFS radar sensing that can simultaneously mitigate and exploit ISI/ICI effects, to prevent target masking and surpass standard unambiguous detection limits in range/velocity. Moreover, considering two operational modes (discovery/track), we propose an adaptive MIMO-OTFS ISAC transmission strategy. For the discovery mode, we introduce the concept of delay-Doppler (DD) multiplexing, enabling omnidirectional probing of the environment and large virtual array at the OTFS radar receiver. For the track mode, we pursue a directional transmission approach and design an OTFS ISAC optimization algorithm in spatial and DD domains, seeking the optimal trade-off between radar signal-to-noise ratio (SNR) and achievable rate. Simulation results verify the effectiveness of the proposed sensing algorithm and reveal valuable insights into OTFS ISAC trade-offs under varying communication channel characteristics.
Share
Files
Integrated_Sensing_and_Communications_With_MIMO-OTFS_ISI_ICI_Exploitation_and_Delay-Doppler_Multiplexing_author.pdf (2.822Mb)
Identifiers
URI: https://hdl.handle.net/20.500.12761/1887
DOI: 10.1109/TWC.2024.3370501
Metadata
Show full item record

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