M-ary Cyclic Shift Keying Spread Spectrum Underwater Acoustic Communications Based on Virtual Time-Reversal Mirror

Underwater acoustic communications are challenging because channels are complex, and acoustic waves when propagating in the ocean are subjected to a variety of interferences, such as noise, reflections, scattering and so on. Spread spectrum technique thus has been widely used in underwater acoustic...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2019-08, Vol.19 (16), p.3577
Main Authors: Zhou, Feng, Liu, Bing, Nie, Donghu, Yang, Guang, Zhang, Wenbo, Ma, Dongdong
Format: Article
Language:English
Subjects:
Acoustic noise
Acoustic propagation
Acoustic waves
Acoustics
Bit error rate
Channels
Communication
Engineering
International conferences
Keying
Laboratories
Physical properties
Signal processing
Spectrum allocation
Spread spectrum
spread spectrum communication
Spread spectrum transmission
Time reversal mirrors
time-reversal mirror
Transmitters
underwater acoustic communication
Underwater acoustics
Underwater communication
Wave propagation
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Summary:Underwater acoustic communications are challenging because channels are complex, and acoustic waves when propagating in the ocean are subjected to a variety of interferences, such as noise, reflections, scattering and so on. Spread spectrum technique thus has been widely used in underwater acoustic communications for its strong anti-interference ability and good confidentiality. Underwater acoustic channels are typical coherent multipath channels, in which the inter-symbol interference seriously affects the performance of underwater acoustic communications. Time-reversal mirror technique utilizes this physical characteristic of underwater acoustic channels to restrain the inter-symbol interference by reconstructing multipath signals and reduce the influence of channel fading by spatial focusing. This paper presents an M-ary cyclic shift keying spread spectrum underwater acoustic communication scheme based on the virtual time-reversal mirror. Compared to the traditional spread spectrum techniques, this method is more robust, for it uses the M-ary cyclic shift keying spread spectrum to improve the communication rate and uses the virtual time-reversal mirror to ensure a low bit error rate. The performance of this method is verified by simulations and pool experiments.
ISSN:1424-8220
1424-8220
DOI:10.3390/s19163577