Differential Orthogonal Space-Time Block Coding Modulation for Time-Variant Underwater Acoustic Channels

Reliable underwater acoustic (UWA) communications are challenging since the channels are well known to be doubly selective in both time and frequency domains. The doubly-selective fading UWA channels, however, also provide double diversity gains. In addition, multiple transducers and/or hydrophones...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 2017-01, Vol.42 (1), p.188-198
Main Authors: Qu, Fengzhong, Wang, Zhenduo, Yang, Liuqing
Format: Article
Language:English
Subjects:
Acoustics
Basis expansion model
Block codes
Channel estimation
Channels
differential
Doppler effect
Doppler sonar
Fading channels
Hydrophones
MIMO
OFDM
Reliability
Selective fading
space-time block coding (STBC)
Time domain analysis
Transducers
Underwater
underwater acoustic communications
Underwater acoustics
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Summary:Reliable underwater acoustic (UWA) communications are challenging since the channels are well known to be doubly selective in both time and frequency domains. The doubly-selective fading UWA channels, however, also provide double diversity gains. In addition, multiple transducers and/or hydrophones are often deployed, providing space diversity to combat channel fading. To exploit all these diversities, a differential multiple-input-multiple-output (MIMO) scheme for doubly-selective fading channels is presented in this paper. The proposed differential orthogonal space-time block coding (DOSTBC) approach adopts the basis expansion model (BEM) to capture the channel variation in time domain. Both analytical and simulated results show that the proposed BEM-DOSTBC approach is reliable by collecting 3-D diversity: space, multipath, and Doppler. The proposed approach was tested during the RACE08 sea experiment and its reliability was confirmed by the experiment results.
ISSN:0364-9059
1558-1691
DOI:10.1109/JOE.2016.2537678