Stacked Intelligent Metasurface Performs a 2D DFT in the Wave Domain for DOA Estimation - Archive ouverte HAL
Communication Dans Un Congrès Année : 2024

Stacked Intelligent Metasurface Performs a 2D DFT in the Wave Domain for DOA Estimation

Jiancheng An
  • Fonction : Auteur
  • PersonId : 1426492
Chau Yuen
  • Fonction : Auteur
  • PersonId : 1426493
Marco Di Renzo
Mérouane Debbah
  • Fonction : Auteur
  • PersonId : 1426494

Résumé

Staked intelligent metasurface (SIM) based techniques are developed to perform two-dimensional (2D) directionof-arrival (DOA) estimation. In contrast to conventional designs, an advanced SIM in front of a receiver array automatically performs the 2D discrete Fourier transform (DFT) as the incident waves propagate through it. To arrange for the SIM to carry out this task, we design a gradient descent algorithm for iteratively updating the phase shift of each meta-atom in the SIM to minimize the fitting error between the SIM's response and the 2D DFT matrix. To further improve the DOA estimation accuracy, we configure the phase shifts in the input layer of the SIM to generate a set of 2D DFT matrices having orthogonal spatial frequency bins. Extensive numerical simulations verify the capability of a well-trained SIM to perform the 2D DFT. Specifically, it is demonstrated that a SIM having an optical computational speed achieves an MSE of 10 -4 in 2D DOA estimation.
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Dates et versions

hal-04734249 , version 1 (20-10-2024)
hal-04734249 , version 2 (11-11-2024)

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Jiancheng An, Chau Yuen, Yong Liang Guan, Marco Di Renzo, Mérouane Debbah, et al.. Stacked Intelligent Metasurface Performs a 2D DFT in the Wave Domain for DOA Estimation. ICC 2024 - IEEE International Conference on Communications, Jun 2024, Denver, United States. pp.3445 - 3451, ⟨10.1109/icc51166.2024.10622963⟩. ⟨hal-04734249v1⟩
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