Abstract
This paper examines the features of a Hilbert-Huang transform instantaneous frequency for application in underwater voice (I) transmissions. The duration and sampling frequency of the voice (I) sample were 5 s, and 8000 Hz, respectively. The voice (I) sample was inputted into a Matlab-based direct mapping orthogonal variable spreading factor/orthogonal frequency division modulation underwater multimedia communication platform. An underwater actual test channel model was employed in the proposed Matlab-based platform. Applying Hilbert-Huang time–frequency analysis to investigate the IF features of the received voice (I) signal resulted in transmission bit error rates of 0, 10−4, 10−3, 10−2 and 10−1. The mean frequencies of the voice sample (I) signal for IF2 were 646.6, 644, 648.3, 625.2, and 669.0 Hz, respectively, for the transmission bit error rates of 0, 10−4, 10−3, 10−2 and 10−1. The mean frequencies of the voice sample (I) signal for IF2 were 2.6, −3.7, 21.1 and 22.4 Hz, respectively, for the transmission bit error rates of 10−4, 10−3, 10−2 and 10−1.
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Acknowledgments
The authors acknowledge the support of the National Science Council of Taiwan (# NSC 101-2221-E-022-005).
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Lin, C.F., Hsiao, K.J., Wen, C.C., Chang, S.H., Parinov, I.A. (2014). Hilbert-Huang Transform Based Instantaneous Frequency Features for Underwater Voice (I) Transmission. In: Chang, SH., Parinov, I., Topolov, V. (eds) Advanced Materials. Springer Proceedings in Physics, vol 152. Springer, Cham. https://doi.org/10.1007/978-3-319-03749-3_24
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DOI: https://doi.org/10.1007/978-3-319-03749-3_24
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