کلیدواژهها
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Real Hilbert frames, Full spark, Finitely Full spark, Phase retrieval, Norm retrieval.
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چکیده
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Frames were introduced already in 1952 by Duffin and Schaeffer in their fundamental paper
[5]; they used frames as a tool in the study of nonharmonic Fourier series. Then, in 1985, as
the wavelet era began, Daubechies, Grossmann, and Meyer [4] observed that frames can be used
to find series expansions of functions in L2(R) which are very similar to the expansions using
orthonormal bases. Frames are basis-like building blocks that span a vector space but allow
in linear dependency, which is useful to reduce noise, find amesparse representations, spherical
codes, compressed sensing, signal processing, wavelet analysis etc.
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