1995-2005: ten years of active research on underwater acoustic communications in Brest

Lapierre, G.; Beuzelin, Nicolas; Labat, J.; Trubuil, J.; Goalic, André; Saoudi, Samir; Ayela, G.; Coince, P.; Coatelan, S.

doi:10.1109/oceanse.2005.1511752

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Experimental sea trials were carried out the 10th October 2006 in the site "anse de Camaret" near Brest, France, by GESMA/DGA. The aim of these sea trials was to transmit SONAR images in real-time from an autonomous underwater vehicle (AUV) to a ship [15], [16]. The transmitter and the receiver were placed on the AUV and the ship, respectively.…”

Section: B Performances On Signals From Sea Trialsmentioning

confidence: 99%

Blind DFE based on NLMS algorithm with generalized normalized gradient descent regularization

Abdaoui

Laot

2009

Oceans 2009

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This paper presents robust unsupervised decision feedback equalizer (DFE) for acoustic underwater communications. The proposed equalizer consists of the cascade of four devices whose main components are recursive (R) and transverse (T ) filters. The feature of the given equalizer is the ability to deal with severe quickly time varying channels by allowing the adjustment of both, its structure and its adaptation according to a mean square error (MSE) criterion. In the existing solution, the recursive and transverse filters are updated by decision directed least-mean-square (LMS) algorithms. However, the weakness of the LMS like algorithms against the time varying environments pushes us to improve the adaptation by the use of other robust solutions. In this paper, we propose the employ of normalized LMS algorithms with self step-size regularization based on complexvalued generalized normalized gradient descent (GNGD) method instead of simple LMS algorithms. Compared to the existent unsupervised DFE, the proposed solution gives the best performance in channel tracking despite the irregularities and the nonstationarity of the environment. Performance analysis are given in terms of the MSE for both synthetic and realistic channels obtained from underwater acoustic recorded signals.

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Section: B Performances On Signals From Sea Trialsmentioning

confidence: 99%

Blind DFE based on NLMS algorithm with generalized normalized gradient descent regularization

Abdaoui

Laot

2009

Oceans 2009

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“…A relevant application is the transmission of images and data collected from an autonomous underwater vehicles (AUV's). Since a few years ago, GESMA (Groupes d'Etudes Sous-Marines de l'Atlantique at Brest, France), in collaboration with Telecom Bretagne, developped a robust acoustic link, called TRIDENT [2], [3]. Due to the low speed propagation environment (c ≈ 1500m/s), the underwater acoustic channel exhibits high sensitivity to Doppler effect, affecting significantly synchronization (i.e timing and carrier recovery) algorithms [4].…”

Section: Introductionmentioning

confidence: 99%

Blind Doppler compensation scheme for single carrier digital underwater communications

Eynard

Laot

2008

Oceans 2008

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In this paper, we propose a dominant Doppler compensation technique for single carrier single input multiple output (SIMO) underwater acoustic communication. An initial pre-processing of the dominant Doppler is used to speed up the convergence rate of the adaptive receiver at the beginning of the transmission. Then, a tracking scheme is proposed to compensate for the residual dominant Doppler. The receiver scheme is tested in an experimental context. Successful communication is demonstrated at up to 4.926 kSymb/s with a transmitting platform moving up to 1.8 m/s. The system exhibits enhanced robustness for continuous-time communication with large Doppler shifts values and time-varying multipath channels.

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A Quasi-Orthogonal Correlator-Based BPNN Pn Code Acquisition Scheme for Underwater Acoustic DSSS Communication

Chen¹,

Leu²,

Lin³

et al. 2012

Journal of Marine Science and Technology

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1995-2005: ten years of active research on underwater acoustic communications in Brest

Cited by 4 publications

References 9 publications

Blind DFE based on NLMS algorithm with generalized normalized gradient descent regularization

Blind DFE based on NLMS algorithm with generalized normalized gradient descent regularization

Blind Doppler compensation scheme for single carrier digital underwater communications

A Quasi-Orthogonal Correlator-Based BPNN Pn Code Acquisition Scheme for Underwater Acoustic DSSS Communication

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