LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
521
User Manual 1173.9628.02 ─ 16
Fig. 3-24: LTE Multi Evaluation: Error Vector Magnitude
●
Error Vector Magnitude, Magnitude Error and Phase Error (vs symbol)
The diagrams (bar graphs) show the average EVM, magnitude error, and phase
error for each SC-FDMA symbol in the measured slot. The symbols are numbered
from 0 to 6 (5) for normal (extended) cyclic prefix duration, with the reference sym-
bol labeled 3 (2).
The measured slot is located in the configured "Measure Subframe". Only a single
carrier is analyzed. For signals with carrier aggregation, you can select which car-
rier is measured (setting "Measurement Carrier").
The bar graphs show RMS averaged and therefore positive values. The average
runs over all modulation symbols in the SC-FDMA symbol. The R&S
CMW calcu-
lates two values (e.g. EVM
l
and EVM
h
) for each SC-FDMA symbol and displays
chapter 3.2.1.7, "Calculation of Modulation Results"
●
Error Vector Magnitude vs subcarrier
The diagram shows the EVM in all allocated subcarriers of the measured slot. Only
a single carrier is analyzed. For signals with carrier aggregation, you can select
which carrier is measured (setting "Measurement Carrier").
The values are RMS averaged over the SC-FDMA data symbols in the subcarrier.
chapter 3.2.6.11, "Detailed Views: TX Measurement and
For the parameters at the bottom, see
chapter 3.2.6.14, "Common View Elements"
For query of the diagram contents via remote control, see:
●
chapter 3.5.3.16, "EVM Results (Traces)"
General Description
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