Blind paraunitary equalization

  • Authors:
  • Sylvie Icart;Pierre Comon;Ludwig Rota

  • Affiliations:
  • Laboratoire I3S, CNRS UMR 6070, Université de Nice, 2000 route des Lucioles, BP 121, 06903 Sophia-Antipolis Cedex, France;Laboratoire I3S, CNRS UMR 6070, Université de Nice, 2000 route des Lucioles, BP 121, 06903 Sophia-Antipolis Cedex, France;Orange Business Service, Sophia-Antipolis, France

  • Venue:
  • Signal Processing
  • Year:
  • 2009

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Abstract

In this paper a blind multiple-input/multiple-output (MIMO) space-time equalizer is described, dedicated to convolutive mixtures when observations have been pre-whitened. Filters preserving space-time whiteness are paraunitary; a parameterization of such filters with plane rotations is proposed. Theoretical developments then lead to a numerical algorithm that sweeps all pairs of delayed outputs. This algorithm involves the solution of a polynomial system in two unknowns, whose coefficients depend on the output cumulants. Simulations and performance of the numerical algorithm are reported.