WCDMA Multi Evaluation Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
574
User Manual 1173.9657.02 ─ 11
The constellation diagram depends on the modulation type. For an ideal single QPSK
signal, the constellation diagram consists of four points, located on a circle around the
origin, with relative phase angles of 90 deg. If several physical channels with different
power levels contribute to the analyzed signal, more constellation points occur. The
example above shows a signal configuration including high speed channels.
For QPSK signals the correct orientation of the diagram has to be selected to deter-
mine correct I/Q imbalance results, see parameter
See also: "I/Q Constellation Diagram" in the R&S
CMW user manual, chapter "System
Overview"
For additional information refer to
chapter 3.2.6.13, "Common View Elements"
3.2.6.5
Detailed Views: UE Power and Power Steps
Each of the detailed views shows a diagram per carrier and a statistical overview of
single-slot results.
Fig. 3-17: WCDMA multi evaluation: power steps (with HSPA channels, test case "TPC 0 dB")
●
Power
Transmitter output power of the UE, measured in a bandwidth of at least (1+
α
)
times the chip rate, where
α
is the roll-off factor of the WCDMA channel filter. The
UE power corresponds to the "mean power" defined in 3GPP TS 34.121.
The diagram covers a time interval of up to 120 slots. The "Current" traces contain
one measurement result per slot or half-slot, which is calculated as the average of
General Description
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