R&S
®
CMW 500 WCDMA Applications
WCDMA TX Measurements
Operating Manual 1202.3986.32 – 03 306
center carrier frequency. The maximum display range is [carrier frequency – 12.5 MHz,
carrier frequency + 12.5 MHz]. According to the standard 3GPP TS 34.121, a
resolution filter of Gaussian shape with a bandwidth of 30 kHz (for frequencies
between 2.515 MHz and 3.485 MHz from the carrier) or 1 MHz (for frequencies
between 4 MHz and 12 MHz) is used. All measured spectrum emission values are
relative to the UE output power measured in a 3.84 MHz bandwidth (reference power).
CDP vs Slot
The CDP vs Slot diagram covers a time interval of up to 120 slots. The CDP
measurement provides a comparison of the DPCCH and the DPDCH powers within the
UL WCDMA signal. Note that the channelization code of the DPCCH is fixed (C
256,0
, Q
signal), whereas the f the Q-signal whereas the DPDCH can use variable spreading
factors and channelization codes.
The "Overview" dialogs can be modified as follows:
Click a diagram to select this diagram. Press ENTER or the rotary knob to open
the detailed view for this diagram.
Press "Display > ...Trace Enable..." to select the displayed trace types.
Use the "Multi Evaluation" settings in the configuration menu to modify the scope
of the measurement. Note that a half-slot "Measurement Period" increases the
number of results in the upper three diagrams by a factor of two.
Detailed Views: Modulation and Code Domain Power
Each of the detailed views shows a diagram and a statistical overview of single-slot
results. The WCDMA multi-evaluation measurement provides four different detailed
views, corresponding to the three modulation diagrams (Error Vector Magnitude
(EVM), Magnitude Error, Phase Error) and to the ACLR diagram.
An example (Error Vector Magnitude) is shown below.
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