Fig. 1. Spectrogram of dolphin whistle.
Fig. 2. Dolphin whistle mimicking communication signal spectrogram, (a) large K, (b) small K.
Fig. 3. Dolphin whistle biomimicking communication signal structure.
Fig. 4. Multipath gain combiner.
Fig. 5. Non-coherent FSK demodulator.
Fig. 6. Path combining vs BER gain.
Fig. 7. Channel delay (a) and sound speed profile (b).
Fig. 8. Simulation BER result, (a) 10 msec, (b) 20 msec.
Fig. 9. Lake experiment configuration.
Fig. 10. Received signal spectrogram (a) and time delay spread (b) of Kyungchun lake experiment.
Table 1. BER results of Kyugchun lake experiments.
Table 2. Correlation coefficient average.
References
- S. Liu, G. Qiao and A. Ismail, "Covert underwater acoustic communication using dolphin sounds," J. Acoust. Soc. Am. 133, EL300 (2013). https://doi.org/10.1121/1.4795219
- S. Liu, T. Ma, G. Qiao, L. Ma, and Y. Yin, "Biologically inspired covert underwater acoustic communication by mimicking dolphin whistles," J. Appl. Acoust., 120, 120-128 (2017). https://doi.org/10.1016/j.apacoust.2017.01.018
- G. Qiao, Y. Zhao, S. Liu, and M. Bilal, "Dolphin sounds inspired covert underwater acoustic communication and micro modem," J. Sensors, 17, 2447 (2017).
- V. M. Janik and L. S. Sayigh. "Communication in bottlenose dolphins: 50 years of signature whistle research," J. Comparative Physiology A. 6, 479-489 (2013).
- D. K. Mellinger, S. W. Martin, R. P. Morrissey, L. Thomas, and J. J. Yosco, "A method for detecting whistles, moans and other frequency contour sounds," J. Acoust. Soc. Am., 129, 4055-4061 (2011). https://doi.org/10.1121/1.3531926
- T. H. Lin, L. S. Chou, T. Akamatsu, H. C. Chan, and C. F. Chen, "An automatic detection algorithm for extracting the representative frequency of cetacean tonal sounds," J. Acoust. Soc. Am. 134, 2477-2485 (2013). https://doi.org/10.1121/1.4816572
- D. Gillespie, M. Caillat, J. Gordon, and P. White, "Automatic detection and classificatioin of odeontocete whistles," J. Acoust. Soc. Am. 134, 2427-2437 (2013). https://doi.org/10.1121/1.4816555
- X. Wang, M. Fei, and X. Li, "Performance of chirp spread spectrum in wireless communication systems," Proc. IEEE Communication Systems, Singapore, (2008).
- W. R. Bennet and S. O. Rice, "Spectral density and autocorrelation functions associated with binary frequency shift keying," J. Bell Labs Technical, 42, 2355-2385 (1963). https://doi.org/10.1002/j.1538-7305.1963.tb00969.x
- G. E. Bottomley, T. Ottosson, and Y. P. E. Wang, "A generalized RAKE receiver for interference suppression," J. IEEE Selected Areas in Communication, 18, 1536-1545 (2000). https://doi.org/10.1109/49.864017
- U. Gorb, A. L. Welti, E. Zollinger, R. Kung, and H. Kaufmann, "Microcellular direct-sequence spread sprectrum radio system using N-path RAKE receiver," J. IEEE selected Areas in Communication, 8, 772-780 (1990). https://doi.org/10.1109/49.56384
- B. M. Seo and H. S. Cho, "Performance evaluation of diversity reception of underwater acoustic code division multiple access using lake experiment" (in Korean), J. Acoust. Soc. Kr. 36, 39-48 (2017). https://doi.org/10.7776/ASK.2017.36.1.039