Chapter 2 WCDMA Call Mode
Testing User Equipment on WCDMA channels
WCDMA Options Version 6.20
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The limit values for all modulation quality assessment factors are set in the
Measurement Limits Parameter menu. For details on setting or modifying
systems parameters please refer to “Measurement Limits” on page 71. For
descriptions of the test parameters that can be set in the lower half of the
measurement screen refer to “Test parameters” on page 39.
Constellation Display The Constellation Display screen provides a graphical analysis of the modulation
quality measurement’s result. It allows technicians to pinpoint faults of the
terminal for a more detailed failure analysis.
In order to access the constellation display push the [Const. Display] marker tab
from the Modulation Quality menu.
On the right-hand side of the constellation display there are several display fields
showing the channel power value in dBm as well as the measurement results for
the following modulation quality factors: EVM RMS as a percentage, magnitude
error RMS as a percentage, phase error RMS in degrees, Rho, I/Q offset in dB and
I/Q imbalance in dB. For details on the meaning of these factors and their asso-
ciated valid limits see “How to read the modulation quality results display” on
page 51.
The parameters used for measuring and displaying the modulation quality factors
on this screen are identical to the parameters used on the Modulation Quality
screen. For a parameter description refer to “Test parameters” on page 38.
Code Domain The Code Domain menu provides you with the meausrement and display of the
power distribution and the modulation error.
To access the Code Domain menu push the [Code Domain] marker tab from the
Mod. Quality or the Constellation Display menu.
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