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Detector design using a density fit to non-Gaussian noise

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2 Author(s)
Martinez, A.B. ; Dept. of Electr. Eng., Princeton Univ., NJ, USA ; Thomas, John B.

Suboptimal nonlinear detectors for known small signals in non-Gaussian noise are investigated. It is assumed that either the locally optimal nonlinearity is too complex to use or that the noise density is not known precisely. A memoryless suboptimal nonlinearity (ZNL) can be chosen, and the family of densities for which it is optimal is found. A member of this family is then fitted to the observed noise, and the corresponding detector is used. When a rational function is chosen for the nonlinearity, the Pearson family is the set of solution densities. This is not only a general family which contains many common univariate densities, but for nearly Gaussian noise the method of moments can be used efficiently to fit a member density to the noise. The coefficients of a ZNL are estimated for several (non-Pearson) densities using the first four noise moments

Published in:

Information Theory, IEEE Transactions on  (Volume:34 ,  Issue: 3 )

Date of Publication:

May 1988

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