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  • Research Article
  • Open Access

Factor-Graph-Based Soft Self-Iterative Equalizer for Multipath Channels

EURASIP Journal on Wireless Communications and Networking20052005:687651

  • Received: 30 April 2004
  • Published:


We consider factor-graph-based soft self-iterative equalization in wireless multipath channels. Since factor graphs are able to characterize multipath channels to per-path level, the corresponding soft self-iterative equalizer possesses reduced computational complexity in sparse multipath channels. The performance of the considered self-iterative equalizer is analyzed in both single-antenna and multiple-antenna multipath channels. When factor graphs of multipath channels have no cycles or mild cycle conditions, the considered self-iterative equalizer can converge to optimum performance after a few iterations; but it may suffer local convergence in channels with severe cycle conditions.


  • factor graph
  • equalizer
  • iterative processing
  • multipath fading
  • MIMO

Authors’ Affiliations

Silicon Laboratories, Inc., Austin, TX 78735, USA
NEC Laboratories America, Inc., Princeton, NJ 08540, USA
Department of Electrical Engineering, Columbia University, New York, NY 10027, USA


© Lu et al. 2005

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.