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Paper Abstract and Keywords
Presentation 2023-01-26 15:50
Differential OFDM Software MODEMs for Underwater Acoustic Communications
Taichi Fujita, Kouichi Hashimoto, Hiroshi Kubo (Ritsumeikan Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) It is well-known that underwater acoustic communications (UWACs) play an important role in underwater mobile communications. However, UWACs suffer from time selectivity due to Doppler shifts and frequency selectivity due to delay spread, because the speed of sound is 1/200000th that of light. This channel environment is the doubly-selective channel. This paper evaluates the performance of differential orthogonal frequency division multiplexing (OFDM) software modems employing multiple differential detection (MDD) with channel prediction for the doubly-selective channel environment of UWACs. The authors reported that differential OFDMs employing MDD with channel prediction using quadrature phase shift keying (QPSK) and trellis-coded 8 PSK (TC8PSK) are suitable for double selectivity. This paper shows that differential OFDMs with parallel blind demodulation employing different re-samplers can compensate for mismatch due to the average frequency offset assuming UWACs channel environments.
Keyword (in Japanese) (See Japanese page) 
(in English) Underwater Acoustic Communications / Blind / Automatic Frequency Control / Orthogonal Frequency Division Multiplexing / Channel Prediction / Multiple Differential Detection / Trellis-Coded Modulation /  
Reference Info. IEICE Tech. Rep.
Paper #  
Date of Issue  
ISSN Online edition: ISSN 2432-6380
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Conference Information
Committee SR UWT  
Conference Date 2023-01-26 - 2023-01-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Takanawa Campus, Tokai Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Cognitive Radio, Spectrum Management, Heterogeneous Network, SDN, Machine Learning Application, etc. 
Paper Information
Registration To UWT 
Conference Code 2023-01-SR-UWT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Differential OFDM Software MODEMs for Underwater Acoustic Communications 
Sub Title (in English)  
Keyword(1) Underwater Acoustic Communications  
Keyword(2) Blind  
Keyword(3) Automatic Frequency Control  
Keyword(4) Orthogonal Frequency Division Multiplexing  
Keyword(5) Channel Prediction  
Keyword(6) Multiple Differential Detection  
Keyword(7) Trellis-Coded Modulation  
1st Author's Name Taichi Fujita  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Kouichi Hashimoto  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
3rd Author's Name Hiroshi Kubo  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2023-01-26 15:50:00 
Presentation Time 25 minutes 
Registration for UWT 
Paper #  
Volume (vol) vol.122 
Number (no)  
Date of Issue  

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