Multiband OFDM for Covert Acoustic Communications
article
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
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
TNO Identifier
221767
Source
IEEE Journal on Selected Areas in Communications, 26(December), pp. 1662-1673..
Pages
1662-1673.
Files
To receive the publication files, please send an e-mail request to TNO Repository.