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Conference Papers Year : 2023

Metasurface for Enhanced Millimeter-Wave Communications under Imperfect Beam Alignment

Abstract

In this work, we investigate the impact of beam misalignment in the performance of a wireless system employing a metasurface to improve coverage in a non-line-of-sight (NLOS) scenario. The metasurface is modeled by an array of small radiating elements each of them terminated with a complex load. An equivalent Array Factor is defined, which allows visualizing the beamsteering properties of the metasurface in far-field conditions. Angular misalignment is modeled using a truncated Gaussian distribution and an expression to evaluate signal-to-noise ratio (SNR) in the presence of misalignment is derived. Numerical results show an SNR degradation close to 8 dB for 5 • error magnitude and up to 14 dB if high-gain unit cells are used. Three mechanisms are explored, which can be used to reduce SNR degradation: increasing Metasurface dimensions allows recovering SNR by 7.4 dB, low unit cell gain allows improving SNR by close to 10.5 dB when compared to a highgain cell and base station beamwidth decrease from 25.6 • to 12.7 • allows recovering SNR by 4 dB thanks to the higher BS beam gain.
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Dates and versions

hal-04189770 , version 1 (29-08-2023)

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  • HAL Id : hal-04189770 , version 1

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Jesus A. Cumana-Morales, Marceau Coupechoux, Juan Antonio Cordero Fuertes. Metasurface for Enhanced Millimeter-Wave Communications under Imperfect Beam Alignment. IEEE MeditCom 2023: IEEE International Mediterranean Conference on Communications and Networking 2023, Sep 2023, Dubrovnik, Croatia. ⟨hal-04189770⟩
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