Signal Separation

  • Henry D. I. Abarbanel
Part of the Institute for Nonlinear Science book series (INLS)


Now we address some of the problems associated with the first task in Table 1.1. Given observations contaminated by other sources, how do we clean up the signal of interest so we can perform the analysis for Lyapunov exponents, dimensions, model building, etc.? In linear analysis the problem concerns the extraction of sharp, narrowband linear signals from broadband “noise”. This is best done in Fourier domain, but that is not the working space for nonlinear dynamics. The problem of separating nonlinear signals from one another is done in the time domain of dynamical phase space. To succeed in signal separation, we need to characterize one or all of the superposed signals in some fashion which allows us to differentiate them. This is precisely what we do in linear problems as well, though the distinction is spectral there. If the observed signal s(n) is a sum of the signal we want, call it s1(n), and other signals s2(n), s3(n),...,
$$s{\text{(}}n{\text{) = }}{s^{\text{1}}}{\text{ (}}n{\text{) + }}{s^{\text{2}}}{\text{ (}}n{\text{) + }}{s^{\text{3}}}{\text{ (}}n{\text{) + }}...{\text{,}}$$
then we must identify some distinguishing characteristic of s1(n) which either the individual si(n); i > 1 or the sum does not possess.


Lyapunov Exponent Unstable Manifold Signal Separation Chaotic Signal Reference Orbit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Henry D. I. Abarbanel
    • 1
  1. 1.Institute for Nonlinear ScienceUniversity of California—San DiegoLa JollaUSA

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