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WCDMA Multi Evaluation Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
598
User Manual 1173.9657.02 ─ 11
CDP Spreading Factor ← Modulation / CDP
Selects the spreading factor used for display of the code domain monitor results. The
values range from 4 to 256 in powers of 2. For a PCDE measurement conform to
3GPP TS 34.121 the spreading factor must be set to 4.
Remote command:
CDP Power Reference ← Modulation / CDP
Selects the reference for the code domain power (CDP vs. Slot and CDP in CD Moni-
tor). In the current software version the CDP is defined relative to the total power of the
signal, i.e. to the UE Power.
Rotation ← Modulation / CDP
Defines the initial phase reference (φ=0) for I/Q constellation diagrams of QPSK sig-
nals (see parameter
For QPSK signals the symbol mapping between the logic data and the constellation
points cannot be evaluated. As a consequence the overall phase of the diagram is ran-
dom. This is important because the I/Q imbalance results depend on this random over-
all phase.
In order to get correct I/Q imbalance results, select the rotation as follows:
●
0°
: Suitable for QPSK signals with constellation points located on the I and Q axes
(e.g DPCCH plus DPDCH).
●
45°
: Suitable for QPSK signals with constellation points located on the angle bisec-
tors between the I and Q axes (e.g. DPCCH only).
For WCDMA signals (UL Configuration ≠ QPSK) the rotation setting is irrelevant. The
symbol mapping can be evaluated and the position of the constellation points is fixed.
Remote command:
Spectrum
Controls spectrum measurements.
Statistic Count ← Spectrum
See
Remote command:
BER
Controls BER measurements.
Statistic Count ← BER
See
Remote command:
GUI Reference
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