What is the basic approach for the following tasks:
1. Estimation of the inverse transfer function, which transform output signal to the input signal of the black-box system via known measurements of the input and output signals characteristics
simultaneously.
2. Transformation of the previously estimated inverse transfer function from spectral domain to the time domain.

 

1. Deconvolution
2. Inverse Fourrier Transform

 

But only deconvolution or ifft does not give me right answer

 

I don't know what to tell you except recheck everything.