TY - GEN
T1 - Metasurface for Enhanced Millimeter-Wave Communications under Imperfect Beam Alignment
AU - Cumana-Morales, Jesus A.
AU - Coupechoux, Marceau
AU - Cordero-Fuertes, Juan Antonio
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023/1/1
Y1 - 2023/1/1
N2 - 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 5error 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 high-gain cell and base station beamwidth decrease from 25.6to 12.7allows recovering SNR by 4 dB thanks to the higher BS beam gain.
AB - 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 5error 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 high-gain cell and base station beamwidth decrease from 25.6to 12.7allows recovering SNR by 4 dB thanks to the higher BS beam gain.
KW - Metasurface
KW - beamforming
KW - millimeter wave
KW - misalignment
UR - https://www.scopus.com/pages/publications/85175196736
U2 - 10.1109/MeditCom58224.2023.10266589
DO - 10.1109/MeditCom58224.2023.10266589
M3 - Conference contribution
AN - SCOPUS:85175196736
T3 - 2023 IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2023
SP - 334
EP - 339
BT - 2023 IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 3rd IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2023
Y2 - 4 September 2023 through 7 September 2023
ER -