Hi Marcus
Yes, I'm using two USRP N210, one for transmitting the signal and the other to receive the signal.
-First, to transmit the signal, executed the uhd_tx_dpsk.grc code,
example of gnuradio (is attached the image of the diagram and the
signal).
https://goo.gl/3LAJ9N
https://goo.gl/OmYkom
The sampling rate is 1 MHz and the center frequency is 700.3M.
-On a different computer, I executed the usrp_spectrum_sense.py code as follows:
sudo ./usrp_spectrum_sense.py 699M 702M --fft 512 the output and the code are attached
code ( https://goo.gl/YxH12D )
output ( https://goo.gl/iwIoqV )
Also performed a receiver code into gnu radio (imagem) and the signal is received correctly.
https://goo.gl/03dGMR
https://goo.gl/V48NeU
I am very grateful for the help.
Best regards,
Heitor
Subject: Re: [Discuss-gnuradio] [spectrum sense bug][usrp] To: address@hidden; address@hidden From: address@hidden Date: Thu, 3 Mar 2016 12:40:20 +0100
Ah, so you're using another USRP to transmit?
I can't reproduce this right now (not close to USRPs), but could you
send an email with the output of usrp_spectrum_sense attached, and
also the full verbatim command line used to launch it?
Best regards,
Marcus
On 03/02/2016 09:58 PM, Heitor Araujo
wrote:
Hi Marcus,
When the N210 is transmitting, LEDs A,D,E,F are on. When the
N210 is receiving, LEDS C,D,E,F are on.
I run the uhd_fft script and the USRP detected the signal on the
right frequency (The frequency that it was trasmitted - 700.68).
Command to transmit: uhd_siggen -f 700681250.0
To: address@hidden
From: address@hidden
Date: Wed, 2 Mar 2016 21:09:40 +0100
Subject: Re: [Discuss-gnuradio] [spectrum sense bug][usrp]
Hi Heitor,
if the same applies to you just displaying e.g. 10MHz of
bandwidth with uhd_fft, you probably have a hefty oscillator
offset, either on the N210 10MHz reference or your signal
generator. What generates your signal, and which LEDs are
active on your N210?
Best regards,
Marcus
On 02.03.2016 21:06, Heitor
Araujo wrote:
Hi
I'm trying to do a basic spectrum sense with a USRP N210
kit and gnuradio.
I made a literature research and noted that the
“usrp_spectrum_sense.py” code was used in some articles.
But when transmit some signal in a certain frequecy and
execute the “usrp_spectrum_sense.py”, the signal is found
by the code, but it appears in another frequency (usually
about 1Mhz ahead). And also the bandwidth of the received
signal is different from the transmited signal (It seems
it depends of the sample rate of the transmited the
signal).
sudo ./usrp_spectrum_sense.py 699M 702M --fft 512 and
execute the "uhd_tx_dpsk.grc" in gnuradio to transmit the
signal from 700.2M tom 700.4M. The signal is detected in
700.7M to 701M.
Thanks
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