Title :
The role of third order spectrum in maximum likelihood time delay estimation of a random multi-tone signal in noise
Author :
Kletter, Doron ; Messer, Hagit
Author_Institution :
Dept. of Electron. Syst., Tel-Aviv Univ., Israel
Abstract :
The authors present the maximum-likelihood (ML) time-delay estimator (TDE) for a special class of non-Gaussian signals, when the radiated signal is a harmonically related random multitone signal. For this case they show that when the signal has a nonzero bispectrum (i.e. in the case of phase coupling), the ML TDE consists of the noncoherent estimator plus an extra processor that is, at least for low SNR, directly related to the signal bispectrum. The performance of the TDE is analyzed by using the Cramer-Rao lower bound, and it is shown that the improved processor is superior
Keywords :
filtering and prediction theory; random processes; spectral analysis; Cramer-Rao lower bound; maximum likelihood time delay estimation; noise; nonzero bispectrum; phase coupling; random multi-tone signal; third order spectrum; Correlators; Delay effects; Delay estimation; Gaussian noise; Maximum likelihood estimation; Phase estimation; Sensor systems; Signal processing; Signal to noise ratio; Systems engineering and theory;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location :
Glasgow
DOI :
10.1109/ICASSP.1989.266928
