Rate-range for an FH-FSK acoustic modem

ABSTRACT

Signals transmitted through underwater channels experience attenuation due to dissipation of acoustic energy by spreading as well as by absorption. The path loss due to absorption is found to be highly dependent upon the frequency. Ambient noise, which also greatly affects accurate reception of the signal, is also highly dependent upon frequency. For these reasons, the received SNR cannot be assumed to be constant over wideband acoustic signaling schemes. In this paper we determine the (signaling) rate vs. range curves for a FH-FSK modem considering the frequency selective nature of signal attenuation in an acoustic medium.

REFERENCES

• 1: Sumit Roy , Payman Arabshahi , Dan Rouseff , Warren Fox, Wide area ocean networks: architecture and system design considerations, Proceedings of the 1st ACM international workshop on Underwater networks, September 25-25, 2006, Los Angeles, CA, USA [doi>10.1145/1161039.1161046]
• 2: L. Frietag, M. Grund, S. Singh, J. Partan, P. Koski, K. Balldf. The WHOI Micro-Modem: An Acoustic Communications and Navigation System for Multiple Platforms. In Proceedings of the IEEE/MTS Oceans Conference, Washington, DC, USA, September 2005.
• 3: J. Catipovic. Performance Limitations in Underwater Acoustic Telemetry. In IEEE Journal of Oceanic Eengineering. July 1990, vol. 15, Issue 3. pp. 205--216.
• 4: L. Frietag, M Stojanovic, S Singh, M. Johnson. Analysis of Direct-Sequence and Frequency-Hopped Spread Spectrum Acoustic Communication. In IEEE Journal of Oceanic Engineering. October 2001, vol. 26, Issue 4. pp. 586--593.
• 5: Milica Stojanovic, On the relationship between capacity and distance in an underwater acoustic communication channel, Proceedings of the 1st ACM international workshop on Underwater networks, September 25-25, 2006, Los Angeles, CA, USA [doi>10.1145/1161039.1161049]
• 6: R. Coates. Underwater Acoustic Systems. John Wiley & Sons, Inc. New York., 1989.
• 7: J. Proakis. Digital Communications. McGraw-Hill, New York, 1995.

INDEX TERMS

Primary Classification:
  A. General Literature
  A.1 INTRODUCTORY AND SURVEY

Additional Classification:
  J. Computer Applications
  J.2 PHYSICAL SCIENCES AND ENGINEERING
      Subjects: Engineering

General Terms:
Performance

Keywords:
FH-FSK, acoustic energy absorption, underwater acoustic networks