Multiband OFDM for Covert Acoustic Communications

Title

Author

Leus, G.
Van Walree, P.A.

Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics & Computer Engineering

Abstract

A multiband OFDM transmitter and receiver are presented for underwater communications at low SNR. Compared with a single-band OFDMscheme, 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.

Subject

underwater communications
covert communications
multiband OFDM
time-varying systems

To reference this document use:

http://resolver.tudelft.nl/uuid:f8e5fe52-3571-4fae-825b-ab5e64646809

Publisher

IEEE

ISSN

0733-8716

Source

IEEE Journal on Selected Areas in Communications, 26 (9), 2008

Part of collection

Institutional Repository