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Multiuser interference cancellation in time-varying channels.

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 23, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces an advanced receiver combining adaptive time-reversal and successive interference cancellation to separate users in underwater acoustic environments. The method successfully achieves multiuser separation, enhancing communication reliability.

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Area of Science:

  • Underwater acoustics
  • Signal processing
  • Wireless communication

Background:

  • Underwater acoustic channels are challenging due to time-varying multipath propagation.
  • Interference from multiple users degrades communication system performance.

Purpose of the Study:

  • To develop a receiver capable of temporal and spatial interference cancellation for multiuser underwater acoustic systems.
  • To demonstrate the effectiveness of combining adaptive time-reversal with successive interference cancellation and sparse channel estimation.

Main Methods:

  • Embedding an adaptive time-reversal multichannel combiner into an iterative successive interference cancellation receiver.
  • Utilizing matching pursuit for sparse channel estimation.
  • Testing the system with experimental data from the KAM11 experiment.

Main Results:

  • The combined receiver achieved both temporal interference cancellation and spatial interference suppression.
  • Successful decoding of simultaneous transmissions from separate users was demonstrated.
  • Multiuser separation was achieved in a two-user multiple-access system.

Conclusions:

  • The proposed receiver architecture effectively mitigates interference in time-varying underwater acoustic environments.
  • The integration of adaptive time-reversal and successive interference cancellation with sparse channel estimation enables robust multiuser communication.
  • Experimental validation confirms the system's capability for multiuser separation.