We synthesized sin waves in matlab. One pair data are at same lower frequency and same lower power. The other pair are at same higher frequency and same higher power. There are high coherence within both lower/higher frequency pair, because they are almost same in the each pair. But if I mix lower/higher frequency/power together and calculate coherence, the higher frequency showed high coherence, but the lower frequency showed low coherence, although the signal in lower freq should be very coherent! I feel something is wrong with power normalization.
The attached is my matlab file. we used mscohere. BTW would wcoherence be different?
You have to be carful with modelling coherent waves.. you need to begin with certain spectrum width at the start. It will ensure coherence parameters. starting with two or three coherent waves is not correct. there is always a spectrum of few contributing waves. the right way of modelling is spectrum and it’s width.
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