Distance estimation under molecular absorption delay in THz frequency band
Wu, Zhaona; Umebayashi, Kenta; Lehtomäki, Janne (2025-01-28)
IEEE
28.01.2025
Z. Wu, K. Umebayashi and J. Lehtomaki, "Distance Estimation Under Molecular Absorption Delay in THz Frequency Band," in IEICE Communications Express, vol. 14, no. 3, pp. 99-102, March 2025, doi: 10.23919/comex.2024XBL0174
https://creativecommons.org/licenses/by-nc-nd/4.0/
© 2025 The Institute of Electronics, Information and Communication Engineers. This work is licensed under a Creative Commons Attribution Non Commercial, No Derivatives 4.0 License.
https://creativecommons.org/licenses/by-nc-nd/4.0/
© 2025 The Institute of Electronics, Information and Communication Engineers. This work is licensed under a Creative Commons Attribution Non Commercial, No Derivatives 4.0 License.
https://creativecommons.org/licenses/by-nc-nd/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202504152633
https://urn.fi/URN:NBN:fi:oulu-202504152633
Tiivistelmä
Abstract
In this letter, we propose a distance estimation method that accounts for molecular absorption (MA) delay in the THz frequency band. In radio propagation, the time of arrival (TOA) at the receiver from the transmitter is typically determined by the propagation delay, which is the distance divided by the speed of light in a line-of-sight (LoS) scenario. However, in THz the observable TOA could exceed the propagation delay due to an additional delay denoted by MA delay caused by molecular absorption. This MA delay introduces a biased estimate into conventional distance estimations. In this letter, a novel distance estimation method based on TOA incorporating MA delay is proposed. Numerical evaluations indicate that our proposed distance estimation method outperforms the conventional approach by accounting for the effects of MA delay.
In this letter, we propose a distance estimation method that accounts for molecular absorption (MA) delay in the THz frequency band. In radio propagation, the time of arrival (TOA) at the receiver from the transmitter is typically determined by the propagation delay, which is the distance divided by the speed of light in a line-of-sight (LoS) scenario. However, in THz the observable TOA could exceed the propagation delay due to an additional delay denoted by MA delay caused by molecular absorption. This MA delay introduces a biased estimate into conventional distance estimations. In this letter, a novel distance estimation method based on TOA incorporating MA delay is proposed. Numerical evaluations indicate that our proposed distance estimation method outperforms the conventional approach by accounting for the effects of MA delay.
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