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Appl. Sci. 2018, 8(1), 23;

Estimate of Passive Time Reversal Communication Performance in Shallow Water

Department of Marine Science and Convergence Engineering, Hanyang University, Ansan 15588, Gyeonggi, Korea
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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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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