Frequency-Domain Oversampling for Zero-Padded OFDM in Underwater Acoustic Communications

2012 ◽  
Vol 37 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Zhaohui Wang ◽  
Shengli Zhou ◽  
Georgios B. Giannakis ◽  
Christian R. Berger ◽  
Jie Huang
Keyword(s):  
Frequency Domain ◽  
Underwater Acoustic Communications ◽  
Acoustic Communications ◽  
Underwater Acoustic

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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