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Multiuser acoustic communications with mobile users.

S E Cho1, H C Song, W S Hodgkiss

  • 1Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093-0407, USA. scho@ucsd.edu

The Journal of the Acoustical Society of America
|February 1, 2013
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Summary
This summary is machine-generated.

This study introduces an advanced multiuser receiver that effectively separates signals from multiple mobile users, even with overlapping transmissions. The novel system overcomes previous limitations by mitigating Doppler effects, enabling reliable communication in dynamic environments.

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Area of Science:

  • Signal Processing
  • Wireless Communications
  • Underwater Acoustics

Background:

  • Existing multiuser receivers struggle with separating signals from independent, mobile users due to time and frequency overlaps.
  • The Doppler effect from moving users introduces interference across the Doppler dimension, complicating signal separation.
  • Previous adaptive time-reversal processors within successive interference cancellation frameworks were limited to stationary users.

Purpose of the Study:

  • To extend a previously developed receiver to accommodate mobile users by modeling and mitigating Doppler effects.
  • To enable the separation of independent user signals in both temporal and spatial domains, even with user motion.
  • To validate the enhanced receiver's performance in a real-world shallow water experiment.

Main Methods:

  • Developed a multiuser receiver integrating an adaptive time-reversal processor with successive interference cancellation.
  • Modeled the impact of Doppler shifts on communication signals within the interference cancellation framework.
  • Applied the enhanced receiver to data from the KAM11 shallow water experiment.

Main Results:

  • The extended receiver successfully removes interference from moving sources by accounting for Doppler effects.
  • The receiver preserves its ability to remove interference in both temporal and spatial domains despite user motion.
  • Demonstrated successful packet separation in a two-user system with one stationary and one moving user.

Conclusions:

  • The enhanced multiuser receiver effectively separates signals from independent, mobile users in challenging underwater acoustic environments.
  • This advancement overcomes the limitations of previous systems by robustly handling Doppler-induced interference.
  • The developed receiver shows significant promise for improving communication reliability in dynamic mobile multiuser scenarios.