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Multiband OFDM for Covert Acoustic Communications | IEEE Journals & Magazine | IEEE Xplore

Multiband OFDM for Covert Acoustic Communications


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...Show More

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.
Published in: IEEE Journal on Selected Areas in Communications ( Volume: 26, Issue: 9, December 2008)
Page(s): 1662 - 1673
Date of Publication: 25 November 2008

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