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http://dx.doi.org/10.7840/kics.2015.40.1.187

Doppler Frequency Estimation for Time-Varying Underwater Acoustic Communication Channel  

Hwang, Chan-Ho (Korea Maritime and Ocean University)
Kim, Ki-Man (Korea Maritime and Ocean University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.40, no.1, 2015 , pp. 187-192 More about this Journal
Abstract
Underwater acoustic communication channels have very complex channel characteristics caused by time-varying sea surface, submarine topography, sound speed, and geometry between transmitter and receiver. Especially, the channel has time-variance and doppler effect due to wind and sea current. We have to recognize the channel state and apply it to communication technique for increasing transmission efficiency in the underwater acoustic channel. In this paper, we present the frame recursive modulation and demodulation method using ambiguity function and autocorrelation function to estimate the doppler frequency. Furthermore, we conducted the simulation and sea experiment to evaluate the performance of the proposed method. When the channel coding technique was not used, the bit error rate performance of the proposed method was improved about 32 % compared with conventional method.
Keywords
underwater acoustic communication; doppler frequency estimation; time-varying channel; ambiguity function; sea experiment;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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