Abstract
Pulse position modulated (PPM) acoustic pulses are difficult to detect since they carry information on delays so, assuring reliable information delivery mainly in shallow sea channels because of strong multipath and other interference sources/causes, large signal fluctuation and high noise level may be considered a timely challenge. This paper proposes a signal analysis based on the Wigner-Ville transform and subsequent image processing so to understand the main characteristics of multipath and interference and their adverse effects on detection of pulse position information. By basing on this approach performance of Maximal Ratio Combining (MRC) and Equal Gain Combining (EGC) have been taken into account.
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