3 Short-Range Comms & IoT Mode
3.9 Occupied BW Measurement
For the LTE-Advanced FDD/TDD and 5G NR modes, the metric result is shown as
below:
Occupied Bandwidth
The occupied bandwidth result is f
2
– f
1,
where f
1
and f
2
are the lower and upper
carrier boundary point. f
1
and f
2
are calculated with Occupied Bandwidth
algorithms.
Total Power or OBW Power
The total power is the power integrated in the specified span setting. The OBW
power is calculated from multiplying the total power by OBW percent power. The
user can select the total power or the OBW power with the Power Ref control in
Meas Setup.
Transmit Freq Error
The transmit freq error (transmit frequency error) result is calculated as the
difference between (f
2
+f
1
)/2 and the tuned center frequency of the signal, where f
1
and f
2
are the lower and upper carrier boundary point.
x dB Bandwidth
The x dB result is a bandwidth measured between two points on the signal which are
a certain number of dBs down from the highest signal point within the OBW Span.
For example, If the ‘x dB’ parameter is set to –26 dB, and the ‘Occupied BW Span’ is
set to 10 MHz, then the maximum signal power level is first determined from the 10
MHz wide trace sweep. Next, the two furthest frequencies below (xdb_f
1
) and above
(xdb_f
2
) the frequency of the maximum level occurrence are found where the signal
level is 26 dB below the peak level. This calculation also uses linear interpolation to
find the lower and upper carrier boundary point within the width of a sweep point
(the span divided by the number of sweep points).
The x dB bandwidth is calculated to be xdb_f2 – xdb_f1.
% of OBW Power
1222 Short Range Comms & IoT Mode User's &Programmer's Reference
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