4.6 Article

Mimicking Multiple Whale Whistles-Based Underwater Covert Communication

Journal

IEEE ACCESS
Volume 10, Issue -, Pages 43934-43942

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2022.3168682

Keywords

OFDM; Symbols; Whales; Time-frequency analysis; Frequency shift keying; Differential phase shift keying; Interference; Underwater communication; biomimetics; OFDM

Funding

  1. Agency for Defense Development, South Korea [UD200010DD]

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This paper proposes continuous phase-multiple chirp modulation (CP-MCM) and hybrid orthogonal whistle modulation (HOWM) methods to improve the mimicking performance and bit error rate (BER) of underwater biomimetic covert communications. The results of computer simulations and practical ocean experiments show that the proposed HOWM achieves better BER performance compared to conventional methods.
In underwater biomimetic covert communications, multiple whale whistles are mimicked for improving covertness. The conventional mimicking methods suffered from the trade-off between the mimicking performance and the bit error rate (BER). In this paper, we propose a continuous phase-multiple chirp modulation (CP-MCM) and a hybrid orthogonal whistle modulation (HOWM) to improve the BER and the mimicking performance of the biomimetic covert communication with the multiple whistles. The proposed CP-MCM utilizes chirp signals as the carriers of transmission symbols to mimic the frequency contour of the whistles accurately. The proposed HOWM utilizes the conventional OFDM in the overlapping whistle regions to avoid the interferences and the CP-MCM in the nonoverlapping regions to attain the large mimicking performance. Computer simulations and practical ocean experiments demonstrated that the proposed HOWM mimicked the multiple whistles with better BER performance than conventional methods.

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