Title :
Multi-frequency shift key and differential phase shift key for acoustic modem
Author :
LeBlanc, Lester R. ; Beaujean, Pierre-Philippe
Author_Institution :
Dept. of Ocean Eng., Florida Atlantic Univ., Boca Raton, FL, USA
Abstract :
An underwater acoustic modem has been developed for autonomous underwater vehicles that is robust and low cost. It uses a single TI320c31 DSP chip to transmit packets of multi-frequency orthogonal chirp pulses to overcome noise and multi-path interference. It is robust and can be operated in a chirp multi-frequency shift key (CMFSK) or chirp differential phase shift key (CDPSK) mode. The MFSK mode is more robust but lower in baud rate (2000 baud) compared to the DPSK (4000 baud)
Keywords :
acoustic signal processing; chirp modulation; differential phase shift keying; digital signal processing chips; encoding; frequency shift keying; marine systems; modems; underwater sound; TI320c31 DSP chip; autonomous underwater vehicles; differential phase shift key; multifrequency shift key; multipath interference; orthogonal chirp pulses; underwater acoustic modem; Acoustic noise; Acoustic pulses; Chirp; Costs; Digital signal processing chips; Interference; Modems; Noise robustness; Underwater acoustics; Underwater vehicles;
Conference_Titel :
Autonomous Underwater Vehicle Technology, 1996. AUV '96., Proceedings of the 1996 Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-3185-0
DOI :
10.1109/AUV.1996.532413
