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Re: [Discuss-gnuradio] Phase demodulation

From: Daniele Nicolodi
Subject: Re: [Discuss-gnuradio] Phase demodulation
Date: Tue, 01 Jul 2014 18:33:02 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

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! :)


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