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LTE PRACH Measurement
R&S
®
CMW-KM5xx/-KS5xx
756
User Manual 1173.9628.02 ─ 16
●
Carrier Frequency Error: offset between the measured carrier frequency and the
nominal RF frequency of the measured radio channel
●
Timing Error: Difference between the actual timing and the expected timing. The
timing error measurement requires an "external" trigger signal to derive the expec-
ted timing.
Suitable trigger signals are e.g. the PRACH trigger signal provided by the signaling
application or an external trigger fed in at the TRIG A or TRIG B connector.
The unit T
s
stands for the basic LTE time unit, see
chapter 4.2.7.2, "Preambles in
●
TX Power: received power, RMS averaged over all samples within the preamble
duration
●
Peak Power: peak power of all samples within the preamble duration
For additional information refer to
chapter 4.2.9.9, "Common View Elements"
4.2.9.7
Selecting and Modifying Views
Use the "Display" parameters to select the views and to change the appearance and
contents of the views. Depending on the selected view the following "Display" hotkeys
are available at the bottom of the GUI:
Hotkey
Description
"Select View ..."
Switch to a certain detailed view or overview.
Alternatively select a diagram in the overview and press ENTER or the
rotary knob.
"Select Trace ..."
Select the trace types to be displayed in the view.
"X Scale... / Y Scale..."
Modify the ranges of the X-axis and the Y-axis.
Additional options are available in the "Measurement Control" section of the configura-
tion dialog.
4.2.9.8
Using Markers
Use the "Marker" parameters to activate markers and to modify their position. The fol-
lowing "Marker" hotkeys are available at the bottom of the GUI:
Hotkey
Description
"Ref. Marker ..."
Enable or disable the reference marker and select the marker position. If sev-
eral traces can be displayed, a trace can also be selected.
"Marker 1 /2 ..."
Enable or disable marker 1 or 2 and define the marker position (absolute or rel-
ative to the reference marker).
Depending on the trace mode, a trace can also be selected.
"Select Trace Mode"
Define whether marker 1 and 2 are set to the same trace as the reference
marker (collective) or to selectable individual traces.
General Description
深圳德标仪器
135-1095-0799