LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
22
User Manual 1173.9628.02 ─ 16
Note the SCC state displayed in the main view. After successful SCC activation the
state is "MAC Activated".
2.2.4 External Fading
An external fading scenario allows you to route the downlink baseband signal to an
R&S
AMU200A that superimposes fading on the signal and routes it back. Thus fading
can be added to the downlink signal.
Configuring and activating fading
1. Connect the DUT and the R&S AMU200A to the R&S
"Test Setup for External Fading Scenarios"
2. Configure the signaling application according to the test to be performed, espe-
cially select an external fading scenario and configure the downlink settings.
3. In the configuration tree, section "IQ Settings > IQ Out", note the "Baseband PEP"
and the "Crest Factor".
4. Configure the R&S AMU200A, especially the following settings:
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.
General Description
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