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LTE SRS Measurement
R&S
®
CMW-KM5xx/-KS5xx
817
User Manual 1173.9628.02 ─ 16
The input level ranges of all RF COM connectors are identical.
See also: "RF Connectors" in the R&S
CMW user manual, chapter "Getting Started"
Fig. 5-1: Connecting an RF transmitter to the instrument
5.2.2 How to Measure an Uplink SRS Signal
The measurement expects a pure LTE SRS UL signal. Any other signals, e.g. an LTE
SRS UL signal with additional PUSCH will not yield correct measurement results.
After connecting your LTE UE to the R&S
CMW, you have to adjust at least the follow-
ing analyzer settings to the properties of the analyzed SRS signal:
●
Duplex mode
●
Analyzer "Frequency"
●
"Expected Nominal Power", (optional) "User Margin" and "External Attenuation
(Input)".
Recommended values: "Expected Nominal Power" = peak power of the UE signal
during the measurement; "User Margin" = 0 dB. The smallest possible value of the
"Expected Nominal Power" plus the "User Margin" ensures maximum dynamic
range.
The "Channel Bandwidth" must also be in accordance with the measured signal. For
configuration refer to the "Measurement Control" section of the configuration dialog.
The default trigger settings are usually appropriate and don't need to be modified, see
chapter 5.2.4, "Trigger Modes"
5.2.3 Parallel Signaling and Measurement
The SRS measurement can be used in parallel to the LTE signaling application (option
R&S CMW-KS500/-KS550), i.e. a connection to the UE can be set up by the signaling
application and the sounding reference signal sent by the UE can be measured using
the SRS measurement.
To use both applications in parallel, the combined signal path scenario must be activa-
ted (see
"Scenario = Combined Signal Path"
on page 823). Most signal routing and
analyzer settings and some measurement control settings are then configured by the
signaling application. The SRS measurement displays the corresponding signaling set-
tings instead of its own settings. These signaling settings can be configured both in the
measurement GUI and in the GUI of the signaling application.
General Description
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