Non-stationary signal decomposition

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parham kianian
parham kianian on 18 Feb 2020
suppose f(t) is a non-stationary signal which can be expressed as follow:
f(t) = A1(t)*sin(w1*t) + A2*sin(w2*t) + ... + An(t)sin(wn*t), where 0<= t <= td.
How can I find each Ai corresponding to circular frequency wi?
Is there any MATLAB function which can be employed for this purpose?
emd function decompose a signal to its intrinsic mode functions (IMF) and each IMF has the same length as original signal. I am looking for something like emperical mode decomposition but it should be capable to extract A1, A2, ..., An.

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