How to calculate Coherence Bandwidth from transfer Function H(f)?

Hello,

I have measurement data S21, of many different channels. How can I calculate the coherence Bandwidth of the channels from that?

Thanks a lot for your valuable help

[Derek]

I also need help with this. I found this article. Does this solve our problem?

https://www.mathworks.com/matlabcentral/answers/400698-how-to-calculate-the-coherence-bandwidth