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Re: [Discuss-gnuradio] Posted: Enhanced GMSK demodulator

From: Steven Clark
Subject: Re: [Discuss-gnuradio] Posted: Enhanced GMSK demodulator
Date: Fri, 6 Jun 2008 12:02:01 -0400

On Fri, Jun 6, 2008 at 8:56 AM, isaacgerg <address@hidden> wrote:
> Ive noticed that the papers you cited only take in "real" data and not
> "complex."  Is this true?  Is this true for your implementation?
> Isaac

I think they do in fact take in complex. How would one do a 90deg
phase shift of real data? In any case, my implementation works with
the complex baseband coming from the USRP. After the complex multiply,
a complex-to-float block is used. For one-bit diffdetect, you base
your decision on the imag (sin) component, for two-bit you look at the
real (cos) component.


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