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Re: [Discuss-gnuradio] Phase demodulation

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] Phase demodulation
Date: Thu, 3 Jul 2014 12:17:35 -0400

On Tue, Jul 1, 2014 at 12:33 PM, Daniele Nicolodi <address@hidden> wrote:
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.


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! :)


Yep, that's a pretty classic way to do it. Glad you figured it out!


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