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Appl. Sci. 2018, 8(1), 23; https://doi.org/10.3390/app8010023

Estimate of Passive Time Reversal Communication Performance in Shallow Water

1
Department of Marine Science and Convergence Engineering, Hanyang University, Ansan 15588, Gyeonggi, Korea
2
Agency for Defense Development, Jinhae, P.O. Box 18, Changwon 51678, Gyeongsangnamdo, Korea
*
Author to whom correspondence should be addressed.
Received: 21 November 2017 / Revised: 20 December 2017 / Accepted: 21 December 2017 / Published: 25 December 2017
(This article belongs to the Special Issue Underwater Acoustics, Communications and Information Processing)
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Abstract

Time reversal processes have been used to improve communication performance in the severe underwater communication environment characterized by significant multipath channels by reducing inter-symbol interference and increasing signal-to-noise ratio. In general, the performance of the time reversal is strongly related to the behavior of the q -function, which is estimated by a sum of the autocorrelation of the channel impulse response for each channel in the receiver array. The q -function depends on the complexity of the communication channel, the number of channel elements and their spacing. A q -function with a high side-lobe level and a main-lobe width wider than the symbol duration creates a residual ISI (inter-symbol interference), which makes communication difficult even after time reversal is applied. In this paper, we propose a new parameter, E q , to describe the performance of time reversal communication. E q is an estimate of how much of the q -function lies within one symbol duration. The values of E q were estimated using communication data acquired at two different sites: one in which the sound speed ratio of sediment to water was less than unity and one where the ratio was higher than unity. Finally, the parameter E q was compared to the bit error rate and the output signal-to-noise ratio obtained after the time reversal operation. The results show that these parameters are strongly correlated to the parameter E q . View Full-Text
Keywords: underwater acoustic communication; passive time reversal; q-function; Eq underwater acoustic communication; passive time reversal; q-function; Eq
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Kim, S.; Son, S.-U.; Kim, H.; Choi, K.-H.; Choi, J.W. Estimate of Passive Time Reversal Communication Performance in Shallow Water. Appl. Sci. 2018, 8, 23.

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