Magnitude-squared

Mscohere in Matlab-why would the coherence tends to 1 as nfft increases?

Mscohere in Matlab-why would the coherence tends to 1 as nfft increases?
  1. How to calculate coherence?
  2. What is magnitude-squared coherence?

How to calculate coherence?

Coherence as a measure of confidence in transfer function H1

If a system is linear time-invariant with frequency response (Sxy(ω) = H(ω) Sxx(ω) ), then H(ω) = Sxy(ω)/Sxx(ω).

What is magnitude-squared coherence?

The magnitude-squared coherence (MSC) is a measure that estimates the extent to which one real- or complex-valued signal can be predicted from another real- or complex-valued signal using a linear model. It is also used as a measure of the similarities in the frequency content of two signals.

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