Gradient projection-based channel equalization under sustained fading

Venkatraman Atti, Andreas Spanias, Konstantinos Tsakalis, Constantinos Panayiotou, Leon Iasemidis, Visar Berisha

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Gradient-type adaptive channel equalizers can suffer from burst error problems under sustained fading and in the absence of sufficient excitation. To overcome this problem, we propose an algorithm called the gradient-with-projection-on-bounding-ellipsoid (GPrOBE). The main idea in the proposed GPrOBE algorithm is that the equalizer parameters are computed by projecting the gradient estimate onto a set that is updated using a priori information on the instantaneous error magnitude. Simulation results show an improvement in the performance of the GPrOBE algorithm over other gradient-based algorithms in terms of reduced error bursts. Normalized error energy (NEE) performance analysis highlights that the GPrOBE algorithm yields solutions that are close to minimum mean-square-error (MMSE), while providing instantaneous performance guarantees during periods of insufficient excitation. Bit error rate (BER) experiments reveal that the GPrOBE algorithm is more robust in channels with sustained fading.

Original languageEnglish (US)
Pages (from-to)236-246
Number of pages11
JournalSignal Processing
Issue number2
StatePublished - Feb 2008


  • Burst errors
  • Channel equalization
  • Gradient projections
  • Insufficient excitation
  • Sustained fading

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Signal Processing
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering


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