In this chapter, we employ a general signal characterization based on the normal-mode model for shallow water environments that is applicable to a large class of signals. This characterization is based on a frequency domain formulation that can be used with narrowband as well as wideband signals. The normal-mode characterization assumes perfect waveguide conditions, and as a result, it consists of a homogeneous fluid layer with a soft top and rigid bottom. This environment characterization describes a linear time-varying (LTV) dispersive system which can cause different frequencies to be shifted in time by different amounts. Such dispersive signal transformations are specific to the nature of the environment that the signal propagates through, and they can severely limit the performance of underwater acoustic applications such as communications and sonar. In order to improve the performance of these underwater applications, we propose methodologies that exploit dispersion by waveform design and diversity.

Original languageEnglish (US)
Title of host publicationPrinciples of Waveform Diversity and Design
PublisherInstitution of Engineering and Technology
Number of pages22
ISBN (Electronic)9781613531501
ISBN (Print)9781891121951
StatePublished - Jan 1 2011


  • Acoustic signal processing
  • Dispersive signal transformations
  • Frequency-domain formulation
  • General signal characterization
  • Homogeneous fluid layer
  • LTV dispersive system
  • Linear systems
  • Linear time-varying dispersive system
  • Normal-mode model characterization
  • Perfect waveguide conditions
  • Shallow water environments
  • Sonar
  • Time-varying systems
  • Underwater acoustic communication
  • Underwater acoustic communications
  • Waveform design
  • Waveform design
  • Wideband signals

ASJC Scopus subject areas

  • Engineering(all)


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