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Re: [Discuss-gnuradio] Working at 20 MS/s

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Working at 20 MS/s
Date: Tue, 01 May 2012 20:16:43 -0400
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On 05/01/2012 06:58 PM, Robert McGwier wrote:
Able to use sample rates of 20 MHz doesn't necessarily include doing something as slow and killing of performance as display of an FFT.  


The Gnu Radio FFT display widgets do fairly-heavy decimation in vector-sized chunks, so they're actually fairly non-costly.  You lose sensitivity
  that way, but can display spectral estimates even for fairly high sample rates, since you're only doing an FFT over a small fraction of
  the incoming data--the rest is discarded.

On Tuesday, May 1, 2012, frankist wrote:


I was interested in working with detectors for OFDM 802.11b in my USRP2.
I've read on the internet about this and it seems that there are people
able to use sampling rates of 20 MS/s.

However, when I try to send an OFDM signal with 20 MHz of bandwidth, at
the USRP2 receiver board the FFT plot shows the signal blinking.

This effect only disappears for sampling rates as low as ~2 MHz.

This will affect my detectors performance

What is the main cause for this? Can it be solved?



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Bob McGwier
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Marcus Leech
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Shirleys Bay Radio Astronomy Consortium

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