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Effect of Text Transmission Performance on Delay Spread by Water Surface Fluctuation in Underwater Multipath Channel  

Park, Ji-Hyun (Institute of Acoustics and Vibration Engineering, Pukyong National University)
Kim, Jong-Wook (Department of Information and Communications Engineering, Pukyong National University)
Yoon, Jong-Rak (Department of Information and Communications Engineering, Pukyong National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.48, no.1, 2011 , pp. 1-8 More about this Journal
Abstract
In this paper, a water tank experiment using Binary Frequency Shift Keying (BFSK) method for text transmission performance by water surface fluctuation is conducted. Water surface fluctuation and delay spread which affect the channel coherence bandwidth is a limiting factor in underwater acoustic communication. The amplitude fluctuation and delay spread the smooth surface and fluctuation surface, were identified. The effective delay spread of both cases are 5ms, 4ms corresponding to the coherence bandwidth of 200Hz, 250Hz, respectively. The bit error rate of BFSK modulated text transmission is about $10^{-4}$ in less than 200bps in smooth surface but less than 250bps in fluctuation surface. Therefore, this experiment shows that the water surface fluctuation is important factor determining the performance of the underwater acoustic transmission.
Keywords
Underwater multipath channel; Water surface fluctuation; Delay spread; BFSK; Coherence bandwidth;
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