Multicarrier spread spectrum for Covert Acoustic Communications

Walree, Paul van; Sangfelt, Erland; Leus, Geert

doi:10.1109/oceans.2008.5151841

Cited by 30 publications

(11 citation statements)

References 7 publications

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“…The figure gives the number of bit errors, after the turbo decoder, for an SNR that decreases with the cycle counter. These SNRs are estimated with the method detailed in [28], and have an uncertainty of 2 dB. Exhibiting little delay and Doppler spreading, the channel at 8 km is benign.…”

Section: B Resultsmentioning

confidence: 99%

“…Both channels feature a small Doppler spread, which is due to the stationary geometry and the absence of surface interactions of sound trapped in the channel. The OFDM signals were transmitted every six minutes as part of a periodic transmit schedule comprising various covert modulations and a probe signal [28]. With each cycle the OFDM source level was reduced by 2 dB.…”

Section: A Sea Trialsmentioning

confidence: 99%

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Multiband OFDM for Covert Acoustic Communications

Leus

Walree

2008

IEEE J. Select. Areas Commun.

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135

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Abstract-A multiband OFDM transmitter and receiver are presented for underwater communications at low SNR. Compared with a single-band OFDM scheme, the multiband approach leads to a considerable reduction in the receiver complexity.The proposed system has been tested at sea with 16 subbands covering a total bandwidth of 3.6 kHz, at user data rates of 4.2 and 78 bit/s, and over ranges up to 52 km. At the lower rate, successful message recovery is achieved on a single hydrophone at SNRs down to −17 dB in a benign channel. In channels with a severe delay-Doppler spread the critical SNR rises by some 4 dB. At 78 bit/s the limits of the OFDM signaling scheme are clearly revealed, but at 4.2 bit/s the performance is limited by failure of signal detection and initial synchronization.

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Section: B Resultsmentioning

confidence: 99%

Section: A Sea Trialsmentioning

confidence: 99%

Multiband OFDM for Covert Acoustic Communications

Leus

Walree

2008

IEEE J. Select. Areas Commun.

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135

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“…However, the corresponding data rates are of the order of a few hundred bits per second only. Although progress is still reported on the physical layer, for example on multicarrier modulations [11,12,13,14,15] or covert communication [14,15,16,17], a basic set of modulations and receiver algorithms is now available to support research on higher levels in network architectures.…”

Section: Modem and Network Developmentmentioning

confidence: 99%

The RACUN-project: Robust acoustic communications in underwater networks — An overview

Kalwa

2011

OCEANS 2011 IEEE - Spain

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Modern armed forces are currently transforming into flexible rapid action forces. In international activities typically very few ships need to patrol a large sea area. Effective solutions are needed in order to develop and maintain capabilities for remote coastal monitoring. A network of underwater nodes can rapidly be deployed and fill these gap. In this context a group of leading European Research Institutes and Industry set up a collaborative R&D initiative called 'RACUN' under the umbrella of the European Defence Agency (EDA). The technology will allow for a network-centric approach to the underwater environment, which is currently not available. This paper gives a general overview of the project, which started in autumn 2010.

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“…The main motive behind this approach is to take advantage of the processing gain that comes from spreadspectrum encoding, which enables to carry out communications at relatively low signal levels and achieve high LPD/LPI performance. [6,7] focus on the same goal with an alternative approach that exploits frequency diversity instead of coding to achieve processing gain. While these works achieved promising results, there is clearly significant room to improve the LPD/LPI performance of the underwater communication schemes.…”

Section: Introductionmentioning

confidence: 99%

Chirp-based LPD/LPI underwater acoustic communications with code-time-frequency multidimensional spreading

Demirors

Melodia

2016

Proceedings of the 11th ACM International Conference on Underwater Networks &Amp; Systems - WUWNet '16

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Most underwater acoustic communication systems incorporate well-recognized, easily detectable narrowband signals modulated over low-frequency carriers at high transmission powers, which ultimately limits LPD/LPI performance of the communication scheme. While there have been promising works concentrating on LPD/LPI performance, they are for the most part based on direct-sequence spread spectrum (DSSS) techniques, which have been shown to be blindly detectable in previous work at relatively low SINR values. As a result, there is likely significant room to improve the LPD/LPI performance of underwater acoustic communication schemes. To this end, in this paper, we propose the preliminary design of a novel communication scheme based on transmitting chirp signals that are further spread over a multidimensional domain spanning code, time, and frequency. We evaluated the performance of the proposed scheme both with simulation and experimental studies.

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Multicarrier spread spectrum for Covert Acoustic Communications

Cited by 30 publications

References 7 publications

Multiband OFDM for Covert Acoustic Communications

Multiband OFDM for Covert Acoustic Communications

The RACUN-project: Robust acoustic communications in underwater networks — An overview

Chirp-based LPD/LPI underwater acoustic communications with code-time-frequency multidimensional spreading

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Multicarrier spread spectrum for Covert Acoustic Communications

Cited by 30 publications

References 7 publications

Multiband OFDM for Covert Acoustic Communications

Multiband OFDM for Covert Acoustic Communications

The RACUN-project: Robust acoustic communications in underwater networks &#x2014; An overview

Chirp-based LPD/LPI underwater acoustic communications with code-time-frequency multidimensional spreading

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The RACUN-project: Robust acoustic communications in underwater networks — An overview