WCDMA Multi Evaluation Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
549
User Manual 1173.9657.02 ─ 11
A test setup for a connection with dual carrier HSPA involves two uplink signals. The
two uplink signals must be received via two different RX modules at different Signaling
Units Wideband (SUWs). This implies that the instrument must be equipped with two
SUWs.
3.2.1.2
Measuring an Uplink WCDMA Signal
After connecting your WCDMA UE to the R&S
CMW you have to adjust the following
analyzer settings to the properties of the analyzed UL WCDMA signal:
●
The analyzer "Frequency"
●
The "Expected Nominal Power" and (optional) a "User Margin" and "External
Attenuation". Recommended values: "Expected Nominal Power" = peak power of
the UE signal over the entire measurement range; "User Margin" = 0 dB (the small-
est possible value ensures maximum dynamic range).
For synchronization to the received signal and proper decoding, the "UE Signal Info"
settings in the configuration dialog must be in accordance with the measured signal. In
particular, ensure that the following parameters match up:
●
The "Scrambling Code" and the "UL DPCCH Slot Format"
●
The "UL Configuration"
●
The information whether a DPDCH is configured or not ("UL DPDCH Available").
The R&S
CMW can auto-detect the spreading factor of the DPDCH and of the E-
DPDCHs (for HSUPA) and the corresponding symbol rates.
With matching "UE Signal Info" settings, the R&S
CMW is able to decode the WCDMA
UL signal and determine its slot timing. No additional measurement trigger is required.
3.2.1.3
Defining the Scope of the Measurement
The WCDMA multi evaluation measurement is a multislot application: The R&S
CMW
can measure up to 120 consecutive WCDMA slots (8 frames) in a single measurement
cycle and store the measurement results for each slot. The total number n of slots per
measurement cycle is termed the "Measurement Length" (slots no. 0 to n – 1).
Within this measurement interval, two individual slots are selected for a more detailed
analysis:
●
The "Preselected Slot" is used for single slot measurements, e.g. to measure the
Adjacent Channel Leakage power Ratio (ACLR), the spectrum emissions, the code
domain monitor results and single slot modulation measurements (vs. chip results).
●
For the multislot measurements statistical results are measured for all slots and are
displayed for one slot at a time, the "Slot Number (Table)". Statistical results are
relevant in particular if the "Measurement Length" is measured repeatedly.
General Description
深圳德标仪器
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