EVM Measurements
Section Overview
Error Vector Magnitude (EVM) is a measurement of modulator or
demodulator performance in the presence of impairments. Essentially,
EVM is the vector difference at a given time between the ideal (transmitted)
signal and the measured (received) signal. If used correctly, these
measurements can help in identifying sources of signal degradation,
such as: phase noise, I-Q imbalance, amplitude non-linearity and filter
distortion
These types of measurements are useful for determining system
performance in communications applications. For example, determining
if an EDGE system conforms to the 3GPP radio transmission standards
requires accurate RMS, EVM, Peak EVM, and 95th percentile for the
EVM measurements.
Users can create the EVM object in two ways: using a default
object or by defining parameter-value pairs. As defined by the 3GPP
standard, the unit of measure for RMS, Maximum, and Percentile EVM
measurements is percentile (%). For more information, see the commmeasure.EVM help page.
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