About Composite Error Summary Data (1xEV-DO)
When 1xEV-DO Demodulation is enabled, selecting the Ch1 Comp Error Summary trace data shows the composite error summary data. This is the error summary data results for the composite signal.
Composite error summary data is always computed from the first slots in the measurement and ignores the measurement-offset parameter.
Available Composite Error Summary Data Results
Composite EVM, Magnitude and Phase Error data results (%RMS)
In the composite error summary data, the VSA shows the error-vector magnitude and magnitude error as a percentage. Before computing this percentage, the VSA normalizes the constellation diagram such that the outer-most, ideal states have a magnitude of one.
The VSA computes the overall percent error by first computing the error-vector magnitude and magnitude error at each symbol time.
Next, the VSA derives the rms average for each parameter. For example, to compute the rms average for the magnitude error, the VSA takes the square root of the sum of the squares of the individual magnitude-error values at each symbol time.
Because the magnitude of the constellation diagram's outer-most state has been normalized to one, the rms average is the overall, percent error.
Additional Error Summary Data
1xEV-DO Demodulation also provides these additional Error Summary data tables:
Querying summary table data results programmatically
To programmatically query the Trace Summary Table data results using the Summary() and SummaryUnit() methods in the MeasurementData object.
See the How To Query Summary Table Data Results topic for more information.
See Also
