Instrumentation & Measurement Magazine 23-9 - 62

Fig. 3. Block diagram of the adopted sensing device [10].

Fig. 4. The developed user interface.
62	

IEEE Instrumentation & Measurement Magazine	

Fig. 4 shows the user interface of the developed
sensing framework. In detail, the figure shows the
Manager view in the case
of two associated devices.
This is a dynamic interface
and, in case further devices are associating to the
Manager, novel controls
will be displayed on it. In
particular, it is possible to
choose which devices have
to be used, which channel to be monitored, how
many tests have to be performed and the false alarm
probability to be respected.
Additionally, the Manager
can instruct the device to
scan for wide-band users
(DVB-T) or narrow-band
signals (wireless microphone). For each device,
according to its past history
in terms of noise estimation, it can be chosen if it
is necessary to re-estimate
noise power or not (noise
power is employed in detection threshold).
According to different geographical regions,
the vacant channel where
the noise power can be
estimated changes, and
consequently, a further
control on that is provided.
The output of the system is the spectrum of the
scanned channel, the binary
decision about occupancy
status, the acquired energy
and the threshold. Finally,
the lower part of the figure reports the presence of
wireless microphones (up
to 40 in an 8 MHz band).
Some preliminary tests are
realized using a certified
vector signal generator (Agilent N5182A) as the signal
source, and different performance levels are obtained
by varying the signal power
from -50 dBm to -100 dBm.
December 2020



Instrumentation & Measurement Magazine 23-9

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