R&S CMW-KG4 Series, User Manual, Page: 553 / 988

WCDMA Multi Evaluation Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
553 User Manual 1173.9657.02 ─ 11
●
UE: Select an appropriate test mode, so that the UE loops back the received data
via a 12.2 kbps RMC.
●
Measurement: Select the DCCH TTI trigger signal provided by the generator as
trigger source. Enable the BER measurement (i.e. the view, by default it is deacti-
vated). Adjust the settings so that the uplink signal can be measured (see
chap-
ter 3.2.1.2, "Measuring an Uplink WCDMA Signal" , on page 549). Only full-slot
measurements are supported.
The measurement compares the received data with the expected all 1 pattern and pro-
vides the resulting error rates. One data block of the RMC contains 244 bits. They are
mapped to two radio frames (30 slots). For that reason the measurement length used
for RX measurements equals at least 30 slots. If a smaller value is set, 30 slots are
measured nevertheless (see parameter
"Measurement Length" on page 595).
Enable the BER view only when needed. It slows down the multi evaluation measure-
ment considerably.
3.2.3 Multi Evaluation List Mode
The WCDMA multi evaluation list mode requires option R&S CMW-KM012. In this
mode the measurement interval is subdivided into segments, according to the expec-
ted nominal power and frequency steps of the user equipment (UE) under test.
3.2.3.1 List Mode Configuration
Each segment contains an integer number of timeslots and is measured at constant
analyzer settings (i.e. at constant expected nominal power and RF frequency). The fig-
ure below shows a series of four segments with different lengths, powers and frequen-
cies. Orange rectangles depict measured timeslots.
In list mode the R&S CMW can measure code domain, modulation and spectrum
results. The measured quantities can be enabled or disabled individually for each seg-
ment.
In addition to segments with enabled measurements (active segments), the R&S CMW
can also capture segments without any enabled measurements (inactive segments).
Inactive segments are useful for time-consuming UE reconfiguration. For that purpose
you define alternating active and inactive segments. During the active segments you
perform measurements. During the inactive segments you reconfigure the UE for the
next measured segment.
General Description
深圳德标仪器
135-1095-0799