Re: [Discuss-gnuradio] Phase demodulation

On 27/06/2014 20:51, Daniele Nicolodi wrote:
> This question is not strictly GNURadio related, but I hope to find
> people more knowledgeable than me here...
>
> I have a signal x(t) at a carrier frequency fc which is phase modulated.
> The phase modulation itself is modulated at a modulation frequency fmod:
>
> x(t) = Eo cos(2 pi fc t + m(t))
>
> m(t) = Ao cos(2 pi fmod + phi)
>
> I know exactly fmod (it is a coherent modulation/demodulation
> experiment), and I have a good estimate of fc. I need to, extract
> amplitude Ao and phase phi of that modulation.


Hello,

the solution that I found (and that works very well) is to track the
carrier frequency with a digital PLL. With the tracking PLL block in
GNURadio it is easy. GNURadio is fun! :)

Cheers,
Daniele

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