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Memorias de investigación
Artículos en revistas:
Adaptive-FRESH Filters for Compensation of Cycle-Frequency Errors
Año:2010
Áreas de investigación
  • Tecnología electrónica y de las comunicaciones
Datos
Descripción
This paper deals with the problem of uncertainties in the periodicities of linear almost-periodically time-variant (LAPTV) filters. These filters are usually implemented as a set of branches, each consisting of a frequency shifter followed by a linear time-invariant (LTI) filter. This implementation is also known as FRESH filters. This paper is motivated by the fact that, when there exist errors in the frequency shifts, the optimum set of LTI filters is obtained by canceling the outputs of the corresponding branches. The purpose of this paper is to analyze the nonstationary behavior of adaptive filters in order to mitigate this problem. Our results show that an adaptive filter can offset the errors in the frequency shifts. The reason is that the coefficients of the adaptive filter are updated so that the filter actually performs as a linear periodically time-variant filter for each branch. This allows to track the errors in the frequency shifts when the rate of convergence of the adaptive algorithm is suitably selected. An analytical study of the convergence is presented, which allows to compute the optimal rate of convergence and the mean squared-error attained by the adaptive filter.
Internacional
Si
JCR del ISI
Si
Título de la revista
IEEE TRANSACTIONS ON SIGNAL PROCESSING
ISSN
1053-587X
Factor de impacto JCR
2,212
Información de impacto
Volumen
58
DOI
10.1109/TSP.2009.2028116
Número de revista
1
Desde la página
1
Hasta la página
10
Mes
ENERO
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Omar Artemi Yeste Ojeda (UPM)
  • Autor: Jesus Grajal De la Fuente (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Microondas y Radar
  • Departamento: Señales, Sistemas y Radiocomunicaciones
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