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Flexible Intelligent Metasurfaces in High-Mobility MIMO Integrated Sensing and Communications

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arxiv 2507.18793 v1 pith:CPAH2ZEZ submitted 2025-07-24 eess.SP

Kuranage Roche Rayan Ranasinghe , Jiancheng An , Iván Alexander Morales Sandoval , Hyeon Seok Rou , Giuseppe Thadeu Freitas de Abreu , Chau Yuen , Mérouane Debbah This is my paper · ORCID
classification eess.SP
keywords frequencyisacmodelsensingwaveformsachievablechannelcommunications
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We propose a novel doubly-dispersive (DD) multiple-input multiple-output (MIMO) channel model incorporating flexible intelligent metasurfaces (FIMs), which is suitable for integrated sensing and communications (ISAC) in high-mobility scenarios. We then discuss how the proposed FIM-parameterized DD (FPDD) channel model can be applied in a logical manner to ISAC waveforms that are known to perform well in DD environments, namely, orthogonal frequency division multiplexing (OFDM), orthogonal time frequency space (OTFS), and affine frequency division multiplexing (AFDM). Leveraging the proposed model, we formulate an achievable rate maximization problem with a strong sensing constraint for all the aforementioned waveforms, which we then solve via a gradient ascent algorithm with closed-form gradients presented as a bonus. Our numerical results indicate that the achievable rate is significantly impacted by the emerging FIM technology with careful parametrization essential in obtaining strong ISAC performance across all waveforms suitable to mitigating the effects of DD channels.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Doubly-Dispersive Continuous MIMO Systems: Channel Modeling and Beamforming Design

    eess.SP 2025-08 reject novelty 5.0 of 10

    A doubly-dispersive continuous MIMO channel model with matched-filter-like beamforming is derived, but the variational optimality proof is invalid because the unconstrained problem is unbounded.

  2. AFDM: Evolving OFDM Towards 6G+

    eess.SP 2026-02 conditional novelty 4.0 of 10

    AFDM is presented as an OFDM-backward-compatible 6G+ waveform whose added transceiver cost is two O(N) chirp rotations, supported by a generalized pulse-shaped FDFD channel formulation.

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