I want to perform a simulation where I've a PRBS input (time-domain) that is passed through a port with a s-parameter file (frequency domain) and obtain the output in time-domain but the simulation time by standard method in is too large, so is there a FFT-like method where we can speed up the simulation time by multiplying the frequency response of the input and s-param file and then taking the inverse FT of this multiplicaiton to obtain the time-domain response.
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