Title :
Synchronous phase estimation of a signal corrupted by a close sinusoid
Author :
Plotkin, E.I. ; Swany
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
Abstract :
The authors consider the problem of initial phase estimation of a signal s(1), given frequency, ωs, in the presence of additive noise, w(1), and closely spaced sinusoidal interferences, r(1), whose parameters are unknown a priori. The proposed estimator makes use of a special nonlinear preprocessing based on the LMS minimization of distances between instantaneous values of LP-coefficients which are extracted from the augmented moving-average model of an r(1) interference. The preprocessed incoming signal is then synchronously detected to reveal an initial phase. The estimator is then compared to the four-steps adaptive estimator, showing the potentials of the proposed approach for small values of proximity coefficient D=Δf×N, well beyond the resolution of the discrete Fourier transform (DFT), given by 1/N
Keywords :
filtering and prediction theory; interference (signal); parameter estimation; signal processing; LMS minimization of distances; additive noise; augmented moving-average model; initial phase; nonlinear preprocessing; sinusoidal interference; synchronous phase estimation; Frequency estimation; Gaussian processes; Interference; Least squares approximation; Linear predictive coding; Phase detection; Phase estimation;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on
Conference_Location :
New York, NY
DOI :
10.1109/ICASSP.1988.196915