A linear transform for spectral estimation

The authors propose the introduction of a previous linear transform for rational spectral estimation by using a linear predictor. The method is based on works of Oppenheim [1], [2] on discrete signal representation. The connection with zero-pole (ARMA) spectral estimators is discussed, and the main potential advantages of the approach are indicated: reduction in estimator order, low implementation complexity, and the possibility of increasing frequency resolution. The use of this known linear transform seems to be useful in cases in which the presence of a strong periodicity in the signal to be analyzed is a priori known. Some promising results obtained in processing signals from hydrographic measurements are shown.