Linear and nonlinear smoothing algorithms for widely factorizable signals

  • Authors:
  • Rosa MaríA FernáNdez-Alcalá;JesúS Navarro-Moreno;Juan Carlos Ruiz-Molina;Juan Antonio Espinosa-Pulido

  • Affiliations:
  • University of Jaén, Department of Statistics and Operations Research, Campus Las Lagunillas, 23071 Jaén, Spain and IES Llano de la Viña de Villargordo, C/ Ramiro Aguilera s/n, 23630 ...;University of Jaén, Department of Statistics and Operations Research, Campus Las Lagunillas, 23071 Jaén, Spain and IES Llano de la Viña de Villargordo, C/ Ramiro Aguilera s/n, 23630 ...;University of Jaén, Department of Statistics and Operations Research, Campus Las Lagunillas, 23071 Jaén, Spain and IES Llano de la Viña de Villargordo, C/ Ramiro Aguilera s/n, 23630 ...;University of Jaén, Department of Statistics and Operations Research, Campus Las Lagunillas, 23071 Jaén, Spain and IES Llano de la Viña de Villargordo, C/ Ramiro Aguilera s/n, 23630 ...

  • Venue:
  • Signal Processing
  • Year:
  • 2013

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Abstract

The fixed-point smoothing estimation problem is analyzed for a class of improper complex-valued signals, called widely factorizable, characterized because the correlation of the augmented vector formed by the signal and its conjugate is a factorizable kernel. For this type of signal, widely linear processing is the most suitable approach considering the complete information of the augmented correlation function. Then, from only the knowledge of the second order properties of the augmented vectors involved, linear and nonlinear smoothing algorithms are provided without the necessity of postulating a state-space model. Moreover, in the linear case, recursive formulas for computing the fixed-point smoothing estimation error are proposed.