Cross-Correlated EVM Summary (Flex Frame)

Menu Path: Trace > Data > Cross Channel > Cross Corr EVM Summary

The Cross-Correlated EVM Summary trace displays calculated cross-correlated EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. results when Cross-Correlated EVM Enable is selected (true).

• ccEVM - Cross-correlated EVM result (in dB).

  There are various factors that can contribute to unexpected ccEVM results. To ensure a good ccEVM measurement, do the following:

  1. Increase the Result Length to get more accurate symbol clock error estimation and compensation
  2. Turn on Symbol Clock Error Compensation

• Valid Points - All points except those with reference values that are different between demods, or are zero or NaN.

• Total Points - All points except those with reference values of zero or NaN.

The Cross Correlated EVM Summary trace participates in measurement averaging (MeasSetup > Average) when average type is RMS or RMS Exponential. The "Vect: NNN" annotation at the top of the trace indicates that averaging is done as a complex average rather than RMS averaging ("RMS: NNN") used on other traces.

For more information on ccEVM, see Cross-Correlated EVM.

See Also

Available Trace Data