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LTE PRACH Measurement
R&S
®
CMW-KM5xx/-KS5xx
755
User Manual 1173.9628.02 ─ 16
Signal configuration
Ensure that two subframes before and after the preamble are off (OFF OFF preamble
OFF OFF). This guarantees that the measured "OFF Power (before)" is not falsified by
power contributions of a preceding ON subframe ramped down too slowly, or the "OFF
Power (after)" by a subsequent ON subframe ramped up too early.
You can check the first 100 µs of the trace to ensure that the second subframe before
the preamble is off. For preamble formats 0 and 4 you can also check the end of the
trace to ensure that the second subframe after the preamble is off.
For additional information refer to
chapter 4.2.9.9, "Common View Elements"
4.2.9.6
Detailed Views: TX Measurement
This "single preamble" view contains tables of statistical results for the PRACH mea-
surement.
Fig. 4-13: LTE PRACH: TX Measurement
The table provides an overview of statistical values obtained from the measured pre-
amble. Other detailed views provide a subset of these values:
●
EVM, Magnitude Error, Phase Error: The R&S
CMW calculates RMS and peak val-
ues for low and high EVM window position (l/h); see
chapter 4.2.6, "Calculation of
General Description
深圳德标仪器
135-1095-0799