Contributions to time varying spectrum estimation using the instantaneous power spectrum (IPS). - Ralph D. Hippenstiel; Paulo M. Oliveira (ICASSP, 1989)

Time-varying spectral estimation using the instantaneous power spectrum (IPS). - Ralph D. Hippenstiel; Paulo M. Oliveira (IEEE Trans. Acoust. Speech Signal Process., 1990)

Spectral estimation of short duration signals using time domain extrapolation. - Ralph D. Hippenstiel (ICASSP, 1991)

Wavelet Based Transmitter Identification. - Ralph D. Hippenstiel; Yalcin Payal (ISSPA, 1996)

Wavelet denoising of signals based on the fourth order moment. - Ralph D. Hippenstiel; Spiros Mantis (ISSPA, 2001)