Abstract
Extending the notion of second-order correlations, we define thecumulants of stationary non-Gaussian random fields, and demonstrate their potential for modeling and reconstruction of multidimensional signals and systems. Cumulants and their Fourier transforms calledpolyspectra preserve complete amplitude and phase information of a multidimensional linear process, even when it is corrupted by additive colored Gaussian noise of unknown covariance function. Relying on this property, phase reconstruction algorithms are developed using polyspectra, which can be computed via a 2-D FFT-based algorithm. Additionally, consistent ARMA parameter estimators are derived for identification of linear space-invariant multidimensional models which are driven by unobservable, i.i.d., non-Gaussian random fields. Contrary to autocorrelation based multidimensional modeling approaches, when cumulants are employed, the ARMA model is allowed to be non-minimum phase, asymmetric non-causal or non-separable.
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This work was performed at the University of Southern California, Los Angeles, under National Science Foundation Grant ECS-8602531 and Naval Ocean Systems Center Contract N6601-85-D-0203. The second author was partly supported by Univ. of Virginia Engr. Research Initiation Grant 6-42410, and HDL Contract 5-25227. Parts of this paper were presented at ICASSP-88, New York, NY, April 1988, and at the IV IEEE ASSP Workshop on Spectrum Estimation and Modeling, Minneapolis, MN, August 1988.
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Swami, A., Giannakis, G.B. & Mendel, J.M. Linear modeling of multidimensional non-gaussian processes using cumulants. Multidim Syst Sign Process 1, 11–37 (1990). https://doi.org/10.1007/BF01812204
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DOI: https://doi.org/10.1007/BF01812204