WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
25
User Manual 1173.9657.02 ─ 11
6. Configure coding rates for NB or WB AMR connecion, see
While the speech decoder detects the coding rate of the incoming speech packets
and can adapt to it, the speech encoder uses only the configured coding rate. In
case multiple coding rate M is selected, then the encoder is configured with coding
rate A for NB AMR and coding rate G for WB AMR.
7. Configure any other settings as desired (as for a connection without the audio
board) and switch on the cell signal.
8. Monitor the event log. After switching on the cell, the speech codec is activated.
9. Turn on an internal audio generator of the audio measurements application accord-
ing to the steps below:
a) Select the "Analog Meas" tab or "Digital Meas" tab.
b) Select the relevant generator softkey ("Analog Generator" or "Digital Genera-
tor").
c) Press "ON | OFF" and wait until the generator softkey indicates the "ON" state
and the hour glass symbol has disappeared.
10. Set up a UE originated or UE terminated voice connection.
11. Analyze the audio signal e.g. by means of the audio measurements application.
The WCDMA TX measurements evaluate the different characteristics of the signal
as well.
2.2.6 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:
General Description
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