I was looking for a way to identify time varying time delay. I found that Pade approximation can be a good way. Basically, pade approximation estimates the value of exponential delay term in transfer function of system. But unfortunately i could not find any information about pade approximation in discrete systems. All i found try to estimate exponential term and write a transfer function for that term in s domain. But as everybody knows s domain terms should be convert to z domain for discrete case. When i convert transfer function i found in pade approximation, it bring s another exponential term in z domain. I guess that brings me to the starting point. Maybe i am missing some parts. Could anybody tell me any way about pade approximation in discrete systems?
Regards
