LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
92
User Manual 1173.9628.02 ─ 16
The measurement is started. Wait until the softkey indicates the "RUN" state.
7. Evaluate the measurement results, for example the Total Harmonic Distortion
(THD) and the Signal to Noise Ratio (SNR) of the audio signal.
8. Stop the generator and the measurement:
a) Select the "Analog Meas" softkey and press ON | OFF.
b) Select the "Digital Generator" softkey and press ON | OFF.
2.3.3.5
Testing the Speech Quality with an R&S
UPV
To measure the speech quality of a VoLTE connection, add an audio analyzer to your
test setup. The following example uses an R&S
UPV.
The test setup shown in the following figure is similar to the combination of the micro-
phone test setup and the speaker test setup. But the audio generators and measure-
ments are now located in the R&S
UPV, not in the R&S
CMW. The RF connection /
VoLTE connection is the same as for the preceding tests.
Fig. 2-32: Test setup for external speech analysis
A generator of the R&S
UPV feeds an audio signal to the microphone of the UE. The
UE encodes the audio signal and modulates the RF uplink signal. It transmits the RF
signal via the VoLTE connection to the R&S
CMW. The R&S
CMW demodulates and
decodes the signal. It routes the resulting audio signal via the AF 1 OUT port to an
audio analyzer of the R&S
UPV.
Application Sheets
深圳德标仪器
135-1095-0799
