We propose a novel doubly-dispersive (DD) multiple-input multiple-output (MIMO) channel model incorporating flexible intelligent metasurfaces (FIMs), suitable for integrated sensing and communications (ISAC) in high-mobility scenarios. We show how the proposed FIM-parameterized DD (FPDD) channel model extends to multicarrier waveforms 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 this model, we formulate an achievable rate maxi-mization problem with a sensing constraint for all waveforms and solve it via gradient ascent with closed-form gradients. Numerical results indicate that FIM technology significantly impacts the achievable rate, with careful parametrization essential for strong ISAC performance across all waveforms.
Dynamic metasurface antennas (DMAs) have emerged as a promising solution for reducing the power consumption, hardware cost, and physical size of multiple-input multiple-output (MIMO) systems. This article investigates a DMA-enabled multistream multicast system with finite-alphabet inputs by exploiting statistical chann...
Stacked intelligent metasurfaces (SIMs) have emerged as a promising wave-domain processing technology for sixth-generation integrated sensing and communication networks, reducing reliance on complex radio-frequency hardware. Nevertheless, imperfect channel state information (CSI) can compromise sensing performance and...
A. M. Benaya, Ali A. Nasir, Khaled M. Rabie et al.· 0 citations
To meet the increasing demands for high data rates and large capacity, next generation wireless communication systems require transceivers equipped with a large number of antennas. Massive multiple-input multiple-output (MIMO) with metasurface antennas has emerged as a promising solution. In this paper, we investigate...
Ya-Kun Ma, Hui-Ming Wang, Jia-Ping He et al.· IEEE Transactions on Wireles...· 0 citations
Stacked intelligent metasurfaces (SIM) provide an efficient architecture for integrated sensing and communication (ISAC) with few radio-frequency (RF) chains. However, diagonal SIM provide only element-wise phase control, so balancing multiuser communication and sensing performance may require additional layers. In thi...
Y. Jiao, Qian Zhang, Xue-Jun Cheng et al.· IEEE Wireless Communications...· 0 citations
This paper explores the integration of RIS into 6G architectures, focusing on enhanced beamforming techniques and dynamic channel modeling to improve signal reliability, coverage, and spectral efficiency and evaluates the adaptability of RIS to environmental changes and user mobility.
Fluid intelligent metasurface (FIM) is an emerging antenna architecture that continuously reshapes its physical geometry to optimize wireless performance. While existing studies on FIM-aided integrated sensing and communication (ISAC) rely on co-located single-base-station (BS) deployments, they fundamentally underutil...
Chang-Liu He, Asmaa R. Abdallah, Ahmed M. Eltawil· 0 citations
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