A Complex-Valued RTRL Algorithm for Recurrent Neural Networks

  • Authors:
  • Su Lee Goh;Danilo P. Mandic

  • Affiliations:
  • Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2AZ, U.K.;Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2AZ, U.K.

  • Venue:
  • Neural Computation
  • Year:
  • 2004

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Abstract

A complex-valued real-time recurrent learning (CRTRL) algorithm for the class of nonlinear adaptive filters realized as fully connected recurrent neural networks is introduced. The proposed CRTRL is derived for a general complex activation function of a neuron, which makes it suitable for nonlinear adaptive filtering of complex-valued nonlinear and nonstationary signals and complex signals with strong component correlations. In addition, this algorithm is generic and represents a natural extension of the real-valued RTRL. Simulations on benchmark and real-world complex-valued signals support the approach.