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Introduction

  • Roald Otnes
  • Alfred Asterjadhi
  • Paolo Casari
  • Michael Goetz
  • Thor Husøy
  • Ivor Nissen
  • Knut Rimstad
  • Paul van Walree
  • Michele Zorzi
Chapter
Part of the SpringerBriefs in Electrical and Computer Engineering book series (BRIEFSELECTRIC)

Abstract

Digital underwater communications are becoming increasingly important, with numerous applications emerging in environmental monitoring, exploration of the oceans, and military missions. Until the mid-nineties, the research was focused on hardware and on communication transmitters and receivers for the transmission of raw bits. In network terminology, this is known as the physical layer. A breakthrough was achieved in the mid-nineties by Stojanovic et al. [1], who showed that phase-coherent communication is feasible by integrating a phase-locked loop into a decision-feedback equalizer [2]. Such a receiver can be applied to a single hydrophone, although robust operation at high data rates, say >1 kbit/s, generally requires the presence of a (vertical) hydrophone array for reception. Indeed, multichannel adaptive equalizers have proven to be versatile and powerful tools. If the use of a receive array is impractical, as in multinode networks, then frequency-shift keying (FSK) is often used as a fairly robust modulation for single-receiver systems [3, 4, 5]. However, the corresponding data rates are of the order of 100 bit/s. Although progress is still reported on the physical layer, for example on multicarrier modulations or covert communications, a basic set of modulations and receiver algorithms is now available to support research on higher levels in network architectures.

Keywords

Medium Access Control Autonomous Underwater Vehicle Doppler Power Covert Communication Multicarrier Modulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The authors 2012

Authors and Affiliations

  • Roald Otnes
    • 1
  • Alfred Asterjadhi
    • 2
  • Paolo Casari
    • 2
  • Michael Goetz
    • 3
  • Thor Husøy
    • 4
  • Ivor Nissen
    • 5
  • Knut Rimstad
    • 4
  • Paul van Walree
    • 1
  • Michele Zorzi
    • 6
  1. 1.Maritime Systems DivisionNorwegian Defence Research Establishment (FFI)HortenNorway
  2. 2.Department of Information EngineeringUniversity of PadovaPadovaItaly
  3. 3.Communication, Information Processing, and Ergonomics (FKIE)Fraunhofer Institute (In cooperation with WTD71-FWG)Wachtberg-WerthhovenGermany
  4. 4.Kongsberg MaritimeHortenNorway
  5. 5.Research Department for Underwater Acoustics and Marine Geophysics (FWG)Bundeswehr Technical Centre for Ships and Naval Weapons, Technology and Research (WTD71)KielGermany
  6. 6.Department of Information EngineeringUniversity of PadovaPadovaItaly

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