General Description
R&S
®
CMW-KM750/-KM751
12
User Manual 1173.9670.02 ─ 05
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For the multislot measurements statistical results are measured for all slots and are
displayed for one slot at a time, the "Scalar Slot". Statistical results are relevant in
particular if the "Measurement Length" is measured repeatedly.
Any slot within the measurement interval can be selected.
Fig. 3-2: Preselected Slot and Scalar Slot
The "Preselected Slot" and the "Scalar Slot" are completely independent from each other.
If the "Preselected Slot" can not be measured correctly, this results in an error message
(for example "Underdriven" or "Sync Error"). If there are problems in another slot, but the
"Preselected Slot" is measured correctly, no error message is displayed and the reliability
indicator returned with measurement results equals zero.
3.1.4 Trigger Modes
The TD-SCDMA "Multi Evaluation" measurement can be performed in the following trig-
ger modes (trigger source settings):
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Free Run: The measurement starts immediately after it is initiated. The R&S
CMW
decodes the signal to derive its slot and frame timing so that the "Measurement
Length" can start at a frame boundary of the UL TD-SCDMA signal.
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IF Power: With an internal IF power trigger, the measurement is triggered by the
power ramp of the received bursts.
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External Trigger A/B: External trigger signal fed in via TRIG A or TRIG B on the rear
panel of the instrument. Without a configured trigger delay, a subframe trigger signal
is expected.
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Additional trigger modes: Other firmware applications, e.g. the GPRF generator may
provide additional trigger modes. Refer to the documentation of the corresponding
firmware application for a description of these trigger modes. Without a configured
trigger delay, a subframe trigger signal is expected.
chapter 4.2.4, "Trigger Settings"
3.2 TD-SCDMA RX Tests
RX tests can be carried out in parallel to the TX tests. The following sections describe
how to perform RX tests.
TD-SCDMA RX Tests
