LTE PRACH Measurement
R&S
®
CMW-KM5xx/-KS5xx
752
User Manual 1173.9628.02 ─ 16
Fig. 4-10: LTE PRACH: EVM vs Preamble
The diagram shows results for a configurable number of preambles (up to 16), labeled
1 to n. The preambles are captured within one measurement interval and must have a
periodicity of 20 ms, so each 20 ms the start of a preamble is expected.
●
Error Vector Magnitude vs Preamble:
The diagram displays EVM RMS values. For each preamble either the result deter-
mined for low EVM window position or the result determined for high EVM window
position is shown - whichever is the higher. Thus for this diagram the setting
is ignored.
●
Power vs Preamble:
The diagram displays TX power values (received power, RMS averaged over all
samples within the preamble duration).
Table
The table below the diagram shows additional results. Each column corresponds to
one preamble with the preamble label indicated as column title.
The upper rows correspond to the results presented in the "TX Measurement" view.
For a description see
chapter 4.2.9.6, "Detailed Views: TX Measurement"
The row "Reliability" provides a reliability indicator for each preamble. For a description
of the individual values see
chapter 4.5.1.5, "Reliability Indicator"
General Description
深圳德标仪器
135-1095-0799