Multiband OFDM for Covert Acoustic Communications

Authors:
G. Leus;P. van Walree
Affiliations:
Fac. EEMCS, Delft Univ. of Technol., Delft;-
Venue:
IEEE Journal on Selected Areas in Communications
Year:
2008

Citing 0
Cited 4

Sparse channel estimation for multicarrier underwater acoustic communication: from subspace methods to compressed sensing

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Designing low-complexity detectors based on Seysen's algorithm

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Performance comparison of doppler scale estimation methods for underwater acoustic OFDM

Journal of Electrical and Computer Engineering - Special issue on Underwater Communications and Networking
Information-theoretic analysis of underwater acoustic OFDM systems in highly dispersive channels

Journal of Electrical and Computer Engineering - Special issue on Underwater Communications and Networking

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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.