Title :
Covert underwater communications with multiband OFDM
Author :
Leus, Geert ; van Walree, Paul ; Boschma, Jeroen ; Fanciullacci, Claudio ; Gerritsen, Hans ; Tusoni, Paolo
Author_Institution :
Delft Univ. of Technol., Delft
Abstract :
We consider the use of orthogonal frequency division multiplexing (OFDM) for covert acoustic telemetry. To reduce the complexity of the receiver we use a multiband approach, modulating each band by OFDM. The system has been tested at sea in a highly time-varying environment. A total bandwidth of 3.6 kHz was divided in 16 subbands. Data rates of 4.2 and 78 bit/s were adopted over ranges up to 52 km. At 78 bit/s, communication is successful at SNRs down to -8 dB, whereas the lower rate allows data transfer at SNRs down to at least -16 dB.
Keywords :
OFDM modulation; radio receivers; underwater acoustic telemetry; covert acoustic telemetry; covert underwater communications; data transfer; multiband OFDM; orthogonal frequency division multiplexing; radio receiver; time varying environment; Acoustic noise; Bit error rate; Decoding; Frequency synchronization; OFDM modulation; Phase shift keying; Signal to noise ratio; Underwater acoustics; Underwater communication; Working environment noise;
Conference_Titel :
OCEANS 2008
Conference_Location :
Quebec City, QC
Print_ISBN :
978-1-4244-2619-5
Electronic_ISBN :
978-1-4244-2620-1
DOI :
10.1109/OCEANS.2008.5151860
