BIRD 5000-NG, Operation Manual

Page: 55 / 80

Measurements
46
Statistical Power Measurement
7022
Provides statistical measurements to display the percentage of time that a
particular waveform exists at a specific peak to average power ratio. The
Figure 34 on page 46
illustrates this concept, as applied to an LTE-TDD
waveform.
In
Figure 34
the horizontal axis represents the peak to average power ratio of
the waveform being measured. The vertical axis on the display represents time
in percent. Reading a specific point on the graph provides information as to the
percentage of time that the signal being measured exhibits a specific peak to
average power ratio characteristic.
The performance curve illustrated in
Figure 34
indicates that the maximum
peak to average ratio of the waveform being measured is indicated at the point
where the curve intersects the horizontal axis. This corresponds to a value of
11.5 dB.
Two movable cursors are available within the VPM3 display. These cursors may
be located at any point on the curve, in order to determine specific values of the
waveform peak to average ratio, and corresponding time.
Figure 34 VPM Statistical Power Display
This table represents a few of the statistical curve data points in
numeric format.
Time (%) Peak/Average Ratio (dB)
10% 4.8
1% 7.5
0.1% 9.6
0.01% 10.6