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[Discuss-gnuradio] [spectrum sense bug][usrp]

From: Heitor Araujo
Subject: [Discuss-gnuradio] [spectrum sense bug][usrp]
Date: Wed, 2 Mar 2016 20:06:13 +0000


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.


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