I am trying to use phaseNoiseMeasure (https://www.mathworks.com/help/msblks/ref/phasenoisemeasure.html) function to find dBc/Hz from the time domain data. But it gives me an error as an undefined function.
I also have the FFT data in dB with me, which also probably can be used to fine the dBc/Hz.
In general, I want to find the phase noise in dBc/Hz by any means. But I am lost in how should I get there.