Accession Number : AD0288679

Title :   A NONLINEAR FILTER FOR IMPROVEMENT OF SIGNAL DETECTABILITY IN THE PRESENCE ON NON-GAUSSIAN NOISE

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD CARLYLE BARTON LAB

Personal Author(s) : RICHARD,ROBERT H.

Report Date : OCT 1962

Pagination or Media Count : 1

Abstract : A nonlinear filter is investigated and its effectiveness in improving signal detectability in the presence of certain types of non-Gaussian noise is determined. The filter consists of a zero-memory nonlinear device followed by a lowpass filter, the nonlinear device being designed on the basis of only the first-order statistics of the interfering noise and of the sum of signal and noise. The class of noise used in the study is that obtained by passing Gaussian noise through a zero-memory nonlinear element. Because of this the non-Gaussian process can still be characterized by relatively few parameters. The results of the study indicate that, when the noise probability density function is sufficiently different from Gaussian, a considerable improvement in detection reliability can be obtained. When the noise is Gaussian the filter reduces to a linear one. (Author)

Descriptors :   *NOISE (RADIO), *RADIO SIGNALS, *RADIOFREQUENCY FILTERS, NONLINEAR SYSTEMS, RADIO INTERFERENCE

Distribution Statement : APPROVED FOR PUBLIC RELEASE