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http://dx.doi.org/10.7776/ASK.2013.32.6.494

Performance of Convolution Coding Underwater Acoustic Communication System on Frequency Selectivity Index  

Seo, Chulwon (부경대학교 정보통신공학과)
Park, Jihyun (부경대학교 정보통신공학과)
Park, Kyu-Chil (부경대학교 정보통신공학과)
Shin, Jungchae ((주)한화구미사업단 연구2부)
Jung, Jin Woo ((주)한화구미사업단 연구2부)
Yoon, Jong Rak (부경대학교 정보통신공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.32, no.6, 2013 , pp. 494-501 More about this Journal
Abstract
The convolution code(CC) of code rate 1/2 as a forward error correction (FEC) in Quadrature Phase Shift Keying (QPSK) is applied to decrease bit error rate (BER) by background noise and multipath in shallow water acoustic channel. Ratio of transmitting signal bandwidth to channel coherence bandwidth is defined as frequency selectivity index. BER and bit energy-to-noise ratio gain of transmitted signal according to frequency selectivity index are evaluated. In the results of indoor water tank experiment, BER is well matched theoretical results at frequency selectivity index less than about 1.0. And bit energy-to-noise ratio gain is also matched theoretical value of 5 dB. BER is effectively decreased at frequency selective multipath channel with frequency selectivity index higher than 1.0. But bit energy-to-noise ratio greater than a certain size in terms of CC weaving is effective in reducing bit errors. In the results, the defined frequency selectivity index in this study could be applied to evaluate a performance of CC in multipath channel. Also it could effectively reduced BER in a low speed underwater acoustic communication system without an equalizer.
Keywords
Underwater acoustic communication channel; Error correcting code; Convolution code; Frequency selectivity;
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Times Cited By KSCI : 4  (Citation Analysis)
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