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.
Bob
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:
Hi,
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?
Regards,
Francisco
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