R&S
®
CMW 500 WCDMA Applications
WCDMA TX Measurements
Operating Manual 1202.3986.32 – 03 311
Use the "Multi Evaluation" settings in the configuration menu to modify the scope
of the measurement or change the "Preappointed Slot".
Press "Display > Overview" to switch back to the overview diagram.
9.1.1.6 Conformance Requirements and Limit Settings
Conformance requirements for WCDMA transmitter tests are specified in standard
3GPP TS 34.121, section 5, "Transmitter Characteristics".
The following sections give an overview of the test requirements and the R&S CMW
500 limit settings.
Transmit Modulation
ACLR
Spectrum Emission Mask
Transmit Modulation Limits
A poor modulation accuracy of the UE transmitter increases the transmission errors in
the uplink channel of the WCDMA network. The Error Vector Magnitude (EVM) is the
critical quantity to assess the modulation accuracy of a WCDMA UE.
According to the 3GPP standard, the EVM measured at UE output powers d h20 dBm
and under normal operating conditions shall not exceed 17.5 %. The frequency error
shall not exceed ±0.1 ppm. These limits can be set in the configuration dialog, along
with limits for the other measured quantities.
The table below lists the test requirements of standard 3GPP TS 34.121.
Characteristics Refer to 3GPP TS 34.121, section... Specified Limit
EVM (RMS) 5.13.1 Error Vector Magnitude (EVM)
5.13.1A Error Vector Magnitude (EVM) with HS-DPCCH
< 17.5 %
Peak Code Domain Error 5.13.2 Peak Code Domain Error <–15 dB
Frequency Error 5.3 Frequency Error < 0.1 ppm
ACLR Limits
The energy that spills outside the designated radio channel increases the interference
with adjacent channels and decreases the system capacity. The amount of unwanted
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