Generalized High-Precision and Wide-Angle DOA Estimation Method Based on Space-Time-Coding Digital Metasurfaces

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Qun Yan Zhou
  • Jun Yan Dai
  • Zuqi Fang
  • Lijie Wu
  • Zhen Jie Qi
  • And 4 others
  • Si Ran Wang
  • Rui Zhe Jiang
  • Qiang Cheng
  • Tie Jun Cui

Detail(s)

Original languageEnglish
Pages (from-to)38196-38206
Journal / PublicationIEEE Internet of Things Journal
Volume11
Issue number23
Online published19 Aug 2024
Publication statusPublished - 1 Dec 2024

Abstract

Direction of Arrival (DOA) estimation is essential in building the wireless electromagnetic (EM) environment. However, the conventional DOA estimation methods have been criticized for their hardware complexity, high cost, and low energy efficiency. Recently, metasurface-based methods have emerged as promising alternatives that offer cost-effective solutions. Nevertheless, the existing studies have neglected angle sensitivity, an intrinsic physical property of metasurface, leading to errors in DOA estimations. To address this issue, we propose a generalized high-precision and wide-angle DOA estimation method based on the space-time-coding digital metasurfaces (STCDM). By carefully designing two elementary STC sequences, we realize two angle-independent harmonic states to construct a specified orthogonal matrix. Then, the harmonics, modulated by each meta-column in accordance with the matrix, are sampled by a single channel receiver at different time intervals. Upon the reception of the signal, the information on the metasurface can be comprehensively retrieved through the matrix operations, facilitating the high-accuracy DOA estimations using the array signal processing (ASP) algorithms. This work focuses on eliminating the influence of angle sensitivity on the metasurface-based DOA estimations, which guarantees high accuracy and substantially reduces hardware requirements. The proposed method holds potential for various applications, including Internet of Things (IoT) and integrated sensing and communication (ISAC). © 2024 IEEE.

Research Area(s)

  • Direction of Arrival (DOA), Internet of Things (IoT), metasurface, space-time-coding

Citation Format(s)

Generalized High-Precision and Wide-Angle DOA Estimation Method Based on Space-Time-Coding Digital Metasurfaces. / Zhou, Qun Yan; Dai, Jun Yan; Fang, Zuqi et al.
In: IEEE Internet of Things Journal, Vol. 11, No. 23, 01.12.2024, p. 38196-38206.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review