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Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances

Underwater acoustic (UWA) biomimicking communications have been developed for covert communications. For the UWA covert communications, it is difficult to achieve the bit error rate (BER) and the degree of mimic (DoM) performances at the same time. This paper proposes a biomimicking covert communica...

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Detalles Bibliográficos
Autores principales: Ahn, Jongmin, Lee, Hojun, Kim, Yongcheol, Kim, Wanjin, Chung, Jaehak
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8004036/
https://www.ncbi.nlm.nih.gov/pubmed/33804747
http://dx.doi.org/10.3390/s21062184
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author Ahn, Jongmin
Lee, Hojun
Kim, Yongcheol
Kim, Wanjin
Chung, Jaehak
author_facet Ahn, Jongmin
Lee, Hojun
Kim, Yongcheol
Kim, Wanjin
Chung, Jaehak
author_sort Ahn, Jongmin
collection PubMed
description Underwater acoustic (UWA) biomimicking communications have been developed for covert communications. For the UWA covert communications, it is difficult to achieve the bit error rate (BER) and the degree of mimic (DoM) performances at the same time. This paper proposes a biomimicking covert communication method to increase both BER and DoM (degree of mimic) performances based on the Time Frequency Shift Keying (TFSK). To increase DoM and BER performances, the orthogonality requirements of the time- and frequency-shifting units of the TFSK are theoretically derived, and the whistles are multiplied by the sequence with a large correlation. Two-step DoM assessments are also developed for the long-term whistle signals. Computer simulations and practical lake and ocean experiments demonstrate that the proposed method increases the DoM by 35% and attains a zero BER at −6 dB of Signal to Noise Ratio (SNR).
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spelling pubmed-80040362021-03-28 Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances Ahn, Jongmin Lee, Hojun Kim, Yongcheol Kim, Wanjin Chung, Jaehak Sensors (Basel) Article Underwater acoustic (UWA) biomimicking communications have been developed for covert communications. For the UWA covert communications, it is difficult to achieve the bit error rate (BER) and the degree of mimic (DoM) performances at the same time. This paper proposes a biomimicking covert communication method to increase both BER and DoM (degree of mimic) performances based on the Time Frequency Shift Keying (TFSK). To increase DoM and BER performances, the orthogonality requirements of the time- and frequency-shifting units of the TFSK are theoretically derived, and the whistles are multiplied by the sequence with a large correlation. Two-step DoM assessments are also developed for the long-term whistle signals. Computer simulations and practical lake and ocean experiments demonstrate that the proposed method increases the DoM by 35% and attains a zero BER at −6 dB of Signal to Noise Ratio (SNR). MDPI 2021-03-20 /pmc/articles/PMC8004036/ /pubmed/33804747 http://dx.doi.org/10.3390/s21062184 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ahn, Jongmin
Lee, Hojun
Kim, Yongcheol
Kim, Wanjin
Chung, Jaehak
Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances
title Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances
title_full Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances
title_fullStr Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances
title_full_unstemmed Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances
title_short Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances
title_sort biomimicking covert communication by time-frequency shift modulation for increasing mimicking and ber performances
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8004036/
https://www.ncbi.nlm.nih.gov/pubmed/33804747
http://dx.doi.org/10.3390/s21062184
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