Before to explain my problem I give some technical information about my
hardaware. I’m using USRPs v1 and the boards integrated are XCVR2450
I’m using the script usrp_spectrum_sense.py in a USRP to detect a signal
a ISM channel. To have a signal expressed in db I did this simple
to the received signal:
signal_db = 20*(math.log10(math.sqrt(m.data/tb.slot_number)))
I can control the signal transmitted in the ISM channel; so, I know
the time when there is a signal to be detected in the channel. During
first hours the USRP detects the signal giving me a value of around 40
but after some hours such a detected signal decreases up to roughly 10
and it does not change anymore regardless of the signal transmitted in
ISM channel. Only if I kill the process running the
script and execute it again, the USRP starts to detect again the 40 db
value. The signal to be detected in the ISM channel is always the same.
anyone tell me which is the problem?
Thanks in advance.
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