WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
26
User Manual 1173.9657.02 ─ 11
Reference oscillator settings:
● Source = External
● External Reference Frequency = 10 MHz
Baseband input settings for all used connectors:
● Sample Rate = User-Defined, 100 MHz
● Baseband Input Level: enter the crest factor and the PEP displayed in
Digital I/Q output settings for all used connectors:
● Sample Rate = User-Defined, 100 MHz
● Set Level Via = PEP
● PEP = PEP value displayed in
5. In the R&S AMU200A, activate fading and note the signal level. If you add noise to
the signal, note the signal level without noise.
6. Configure the I/Q input of the R&S
CMW:
In the configuration tree, section "IQ Settings > IQ In > Baseband Level", enter the
signal level noted in the previous step.
Alternatively it is also possible, to specify the signal output level of the R&S
AMU200A, to note the resulting PEP and to enter this PEP value at the R&S
CMW
for "Baseband PEP". But this is not recommended.
7. Turn on the downlink signal at the signaling application and set up a connection.
The configuration is now complete. Fading is active.
A reconfiguration of the settings at the R&S AMU200A during an active connection
to the DUT may result in the loss of the connection or in erroneous measurement
results.
After a reconfiguration of the baseband input settings of the R&S AMU200A, turn
the downlink signal at the signaling application off and on again.
2.2.7 Internal Fading
Testing under realistic air interface conditions is important in order to verify the receiver
performance and the correct operation of the DUT's protocol stack implementation. For
example, block error rates, throughput performance and correct operation of layer 1
procedures like Hybrid Automatic Repeat Request (HARQ) retransmission can be eval-
uated.
The internal fading module comes with a fading simulator and AWGN generator that
can be selectively enabled. It manipulates the generated downlink I/Q data stream to
emulate typical signal conditions at the DUT's receiver.
The following options are required to use the internal fading simulator in WCDMA:
●
one fader I/Q board R&S CMW-B510F or R&S CMW-B520F per signaling instance
using internal fading
●
one option R&S CMW-KS410 "WCDMA R99, advanced signaling" per signaling
instance using fading
●
a single option R&S CMW-KE100 "Basic Fading support: AWGN generator"
General Description
深圳德标仪器
135-1095-0799
