DSP based real-time single carrier underwater acoustic communications using frequency domain turbo equalization

2016 ◽  
Vol 18 ◽  
pp. 40-48 ◽  
Author(s):  
Bo Peng ◽  
Hefeng Dong
Keyword(s):  
Frequency Domain ◽  
Real Time ◽  
Turbo Equalization ◽  
Underwater Acoustic Communications ◽  
Acoustic Communications ◽  
Underwater Acoustic ◽  
Single Carrier

scholarly journals Time-Frequency Domain Turbo Equalization for Single-Carrier Underwater Acoustic Communications

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 73324-73335 ◽  
Author(s):  
Chengbing He ◽  
Lianyou Jing ◽  
Rui Xi ◽  
Han Wang ◽  
Fei Hua ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Turbo Equalization ◽  
Underwater Acoustic Communications ◽  
Acoustic Communications ◽  
Underwater Acoustic ◽  
Time Frequency ◽  
Single Carrier

scholarly journals Combined Hybrid DFE and CCK Remodulator for Medium-Range Single-Carrier Underwater Acoustic Communications

2017 ◽  
Vol 2017 ◽  
pp. 1-11
Author(s):  
Xialin Jiang ◽  
Wei Su ◽  
En Cheng
Keyword(s):  
Frequency Domain ◽  
Multipath Propagation ◽  
Underwater Acoustic Communications ◽  
Acoustic Communications ◽  
Detection Scheme ◽  
Underwater Acoustic ◽  
Time Frequency ◽  
Single Carrier ◽  
Medium Range ◽  
Underwater Acoustic Channels

Advanced modulation and channel equalization techniques are essential for improving the performance of medium-range single-carrier underwater acoustic communications. In this paper, an enhanced detection scheme, hybrid time-frequency domain decision feedback equalizer (DFE) combined with complementary code keying (CCK) remodulator, is presented. CCK modulation technique provides strong tolerance to intersymbol interference caused by multipath propagation in underwater acoustic channels. The conventional hybrid DFE, using a frequency domain feedforward filter and a time domain feedback filter, provides good performance along with low computational complexity. The error propagation in the feedback filter, caused by feedbacking wrong decisions prior to CCK demodulation, may lead to great performance degradation. In our proposed scheme, with the help of CCK coding gain, more accurate remodulated CCK chips can be used as feedback. The proposed detection scheme is tested by the practical ocean experiments. The experimental results show that the proposed detection scheme ensures robust communications over 10-kilometre underwater acoustic channels with the data rate at 5 Kbits/s in 3 kHz of channel bandwidth.

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