transfer function in time domain

Question

I have two signals in time domain (X and Y). I am trying to calculate the transfer function between them. I used the function tfestimate, which returns a transfer function a

Answer 1

This a very common mistake. Many people seem to believe ' means transpose, but actually it means conjugate transpose. To simply transpose you should use .'

So: change

t = ifft([txy' tyx']);

into

t = ifft([txy.' tyx.']);