Model-based spectral estimation of Doppler signals using parallel genetic algorithms.
Conventional spectral analysis methods use a fast Fourier transform (FFT) on consecutive or overlapping windowed data segments. For Doppler ultrasound signals, this approach suffers from an inadequate frequency resolution due to the time segment duration and the non-stationarity characteristics of the signals. Parametric or model-based estimators can give significant improvements in the time-frequency resolution at the expense of a higher computational complexity. This work describes an approach which implements in real-time a parametric spectral estimator method using genetic algorithms (GAs) in order to find the optimum set of parameters for the adaptive filter that minimises the error function. The aim is to reduce the computational complexity of the conventional algorithm by using the simplicity associated to GAs and exploiting its parallel characteristics. This will allow the implementation of higher order filters, increasing the spectrum resolution, and opening a greater scope for using more complex methods.
Solano González
J
J
Departamento de Ingeniería de Sistemas Computacionales y Automatización, Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas, Universidad Nacional Autónoma de México, P.O. Box 20-726, Del. A.Obregón, Mexico.
Rodríguez Vázquez
K
K
García Nocetti
D F
DF
D000465:Algorithms; D001185:Artificial Intelligence; D005583:Fourier Analysis; D005823:Genetics / Q000706:statistics & numerical data; D008962:Models, Theoretical; D009154:Mutation / Q000235:genetics; D012815:Signal Processing, Computer-Assisted; D014465:Ultrasonics