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http://dx.doi.org/10.6109/jkiice.2018.22.2.253

Performance Comparison of Acoustic Equalizers using Adaptive Algorithms in Shallow Water Condition  

Chuai, Ming (Dept. of Information and Communications Engineering, Pukyong National University)
Park, Kyu-Chil (Dept. of Information and Communications Engineering, Pukyong National University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.22, no.2, 2018 , pp. 253-260 More about this Journal
Abstract
The acoustic communication channel in shallow underwater is typically shown as time-varying multipath fading channel characteristics. The received signal through channel transmission cause inter-symbol interference (ISI) owing to multiple components of different time delay and amplitude. To compensate for this, several techniques have been used, and one of them is acoustic equalizer. In this study, we used four equalizers - feed forward equalizer (FFE), decision directed equalizer (DDE), decision feedback equalizer (DFE) and combination DDE with DFE to compensate ISI. And we applied two adaptive algorithms to adjust coefficient of equalizers - normalized least mean square algorithm and recursive least square algorithm. As result, we found that it has a significant performance improvement over 6 dB on SNR in nonlinear equalizer. By combination of DFE and DDE has almost best performance in any case.
Keywords
Underwater acoustic communication; Adaptive algorithms; Adaptive equalizers; BPSK communication system;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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