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A novel channel estimation strategy for practical RIS-aided wideband OFDMA communications

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Abstract

Channel state information acquisition is a crucial task for fully exploiting the appealing advantage of reconfigurable intelligent surface (RIS). In this paper, we develop a novel channel estimation strategy for practical RIS-assisted multiuser orthogonal frequency division multiplexing access (OFDMA) communication. Different from prior works which assume that the RIS has an ideal reflection model, in this work the channel estimation strategy is developed for a practical RIS reflection model by considering the amplitude-phase-frequency response of the reflected signals for wideband systems. To improve the accuracy and efficiency of the channel estimation, we propose a novel channel estimation method with pilot subcarrier allocation and RIS time-varying reflection pattern design. Simulation results demonstrate the superiority of our proposed channel estimation strategy.

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Authors and Affiliations

  1. School of Computer Science and Technology, Dalian University of Technology, Dalian, 116024, China

    Qian Liu

  2. School of Information and Communication Engineering, Dalian University of Technology, Dalian, 116024, China

    Wanning Yang, Ming Li & Rang Liu

Authors
  1. Qian Liu
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  2. Wanning Yang
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  3. Ming Li
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  4. Rang Liu
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Correspondence to Ming Li.

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Part of this paper has been presented in IEEE Wireless Communications and Networking Conference Workshops (WCNCW), 2021 [1].

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Liu, Q., Yang, W., Li, M. et al. A novel channel estimation strategy for practical RIS-aided wideband OFDMA communications. Wireless Netw 29, 3075–3089 (2023). https://doi.org/10.1007/s11276-023-03355-z

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