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Re: [Discuss-gnuradio] Re: FSK now (really) working at 100kbit/sec

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Re: FSK now (really) working at 100kbit/sec
Date: Fri, 15 Apr 2005 09:46:26 -0700
User-agent: Internet Messaging Program (IMP) 4.0-cvs

Quoting Deqiang chen <address@hidden>:

> hello, Eric,
> I remembered there is an annoucement that FSK can work at 100kbps.
> So I dig it out and take a look at the source code for the FSK ( fsk_rx.py)
> . I am a little surprised
> that there are no time recovery there. My understanding is that for fsk, if
> you
> use noncoherent demodulation, you would not need the phase information.
> However, you still need to know the timing in order to correctly sampling
> the output of correlator or matched filter.
> Could you give a hint of what is going on here ?

The timing recovery is happening in the gr.simple_correlator.  It finds the
sampling point by doing a correlation on the preamble.


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