Estimate of Passive Time Reversal Communication Performance in Shallow Wateropen access
- Authors
- Kim, Sunhyo; Son, Su-Uk; Kim, Hyeonsu; Choi, Kang-Hoon; Choi, Jee Woong
- Issue Date
- Jan-2018
- Publisher
- MDPI
- Keywords
- underwater acoustic communication; passive time reversal; q-function; E-q
- Citation
- Applied Sciences-basel, v.8, no.1, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Applied Sciences-basel
- Volume
- 8
- Number
- 1
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/6908
- DOI
- 10.3390/app8010023
- 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.
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Collections - COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY > DEPARTMENT OF MARINE SCIENCE AND CONVERGENCE ENGINEERING > 1. Journal Articles
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