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Re: [Discuss-gnuradio] A medley of questions

From: Steven Clark
Subject: Re: [Discuss-gnuradio] A medley of questions
Date: Wed, 14 Mar 2007 22:24:10 -0400

You're right, I was normalizing for the purposes of plotting. Here's what the raw complex samples look like:
+/- 2400 or so.
and here's that other plot regenerated:

signal is going in to RX at -10dBm, default gain setting.

On 3/14/07, Eric Blossom <address@hidden> wrote:
On Wed, Mar 14, 2007 at 09:47:20PM -0400, Steven Clark wrote:
> Plots of USRP decimation woes:
> input is GMSK waveform @ ~30ksym/sec, BT = 0.35, no noise added
> using decimation rate of 16:
> http://img339.imageshack.us/img339/4467/d16cz9.jpg
> top plot is complex baseband, bottom plot is amplitude of top plot
> some amplitude variations noticeable, but fairly minor.
> using decimation rate of 256:
> http://img256.imageshack.us/img256/2850/d256qh2.jpg
> heavy amplitude variations.
> zoomed in version of previous plots:
> http://img490.imageshack.us/img490/6528/d256zoomedku7.jpg
> Still confused as to what is going on here...

Steve, what's the real amplitude of the received baseband signal?
I suspect that you are normalizing to 1.  Can you regenerate the plots
without normalizing so that we've got an idea of the values coming
across the USB.


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