Chapter 3 WCDMA Non-Call Mode
RF Analyzer for modulation quality
90 WCDMA Options Version 6.20
Additional FM modulation
parameter fields
Mod. Freq. [kHz] — Entry field for the modulation frequency. In frequency
modulation this is the frequency used for modulating the carrier frequency.
Freq. Dev. [kHz] — Entry field for the frequency deviation, i.e. the difference in
frequency between the modulated signal and the carrier frequency.
RF Analyzer for modulation quality
With this option the RF Analyzer offers a method for verifying a UE’s modulation
quality, i.e. its modulation accuracy, in non-call mode.
To gain access to Modulation Quality menu, push the [Mod. Quality] marker tab
while working with the Generator/Analyzer.
This menu displays the results of the modulation quality measurements of the RF
signal received at the RF
IN/OUT connector. The display includes all parameters
essential for assessing the UE’s modulation accuracy, e.g. EVM (Error Vector
Magnitude), Magnitude Error, Phase Error, Frequency Error, Rho, I/Q Offset, and
I/Q Imbalance. For details on these quality assessment parameters refer to
“Reading the results” on page 91 in this section.
As mentioned above, the RF Analyzer takes measurements in non-call mode,
without any call processing functions.
Any Coupling loss table defined in the appropriate menu will be used for non-
call measurements as well.
Before starting a measurement, the radio frequency to be measured on has to be
entered.
There are entry fields available for these parameters in the lower area of the
menu.
Modulation quality
parameters
For a description of the frequency and channel parameter entry fields see “RF
Analyzer parameter fields” on page 103.
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