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140 Chapter 4
Making Measurements
Making the Power Stat CCDF Measurement
Using the Markers
The Marker front-panel key accesses the menu to configure the markers.
•
Select - Allows you to activate up to four markers with the
corresponding numbers, respectively. The selected number is
underlined and its function is defined by pressing the
Function key.
The default selection is 1.
•
Normal - Allows you to activate the selected marker to read the power
level and probability of the marker position on the selected curve, for
example, which is controlled by the RPG knob.
•
Delta - Allows you to read the differences in the power levels and
probabilities between the selected marker and the next.
•
Function - Allows you to set the selected marker function to Band
Power
, Noise, or Off. The default setting is Off. The Band Power and
Noise functions are not available for this measurement.
•
Trace - Allows you to place the selected marker on the Measured,
Gaussian, or Reference curve. The default setting is Measured.
•
Off - Allows you to turn off the selected marker.
•
Shape - Allows you to access the menu to set the selected marker
shape to
Diamond, Line, Square, or Cross. The default setting is
Diamond.
•
Marker All Off - Allows you to turn off all of the markers.
Troubleshooting Hints
The power statistics CCDF measurement can contribute in setting the
signal power specifications for design criteria for systems, amplifiers,
and other components. For example, it can help determine the optimum
operating point to adjust each code timing for appropriate peak/average
power ratio throughout the wide channel bandwidth of the transmitter
for a W-CDMA system.
As this measurement is a new method, there will be some correlations
between CCDF curve degradation and digital radio system
measurement parameters such as BER, FER, code domain power, and
ACPR. Some studies will help set standards for radio design by
specifying the maximum allowed CCDF curve degradation for specific
systems.