20 Scopus citations

Abstract

We investigate a frequency-domain characterization of shallow water environments based on normal-mode models of acoustic mediums. The shallow water environment can be considered as a time-dispersive system whose time-varying impulse response can be expressed as a superposition of time-frequency components with dispersive characteristics. After studying the dispersive characteristics, a blind time-frequency processing technique is employed to separate the normal-mode components without knowledge of the environment parameters. This technique is based on first approximating the time-frequency structure of the received signal and then designing time-frequency separation filters based on warping techniques. Following this method, we develop two types of receivers to exploit the diversity inherent in the shallow water environment model and to improve underwater communication performance. Numerical results demonstrate the dispersive system characterization and the improved processing performance of the receiver structures.

Original languageEnglish (US)
Pages (from-to)2973-2985
Number of pages13
JournalIEEE Transactions on Signal Processing
Volume57
Issue number8
DOIs
StatePublished - Aug 12 2009

Keywords

  • Dispersive channels
  • Time-dispersion diversity
  • Time-frequency analysis
  • Time-frequency mode separation
  • Underwater acoustic communication

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

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