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Re: [Discuss-gnuradio] GMSK: GSM initial phase for a burst

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] GMSK: GSM initial phase for a burst
Date: Tue, 19 Jun 2007 00:04:02 -0700
User-agent: Thunderbird (X11/20070326)

Jeffrey Karrels wrote:
> Great suggestion!
> I have attached a couple of things:
> 1) The IQ plot (1e6 sample rate)
> 2) The burst data (MATLAB array)
> 3) The da vs time plot. (1 symbol = 3.69us)
> Another quick question.  I can now see that after the amplitude ramp
> up that there is a short section of negative phase movement (.7
> radians clockwise) prior to the remaining counterclockwise rotations.
> Should I expect a full (-pi/2) to start off the burst? Is my sampling
> rate just not high enough to catch the remaining rotation? Any other
> suggestions?

I don't see anything at all wrong with this data. 


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