Hi all,
I am trying to make a covert communication channel using SMPS noise generated by the processor as a part of my research.
I want to decode the bits and I think I should use FSK, although I lack understanding to configure the details.
The following is the current flowgraph where I have used bandpass filter to narrow down the signal to ~60kHz and using quadrature block to demodulate.
Since the entity of interest is actual SMPS noise of the laptop adapter instead of a sinosoid, I have no clue how to write a clear decoder after looking at some tutorials of GNU Radio to know the symbol rate etc for the clock recovery algorithm.
I would be grateful, if someone can guide me on how to proceed
Thanks,
Abhinav