Error Vector Spectrum (NB-IoT)

Error Vector Spectrum shows the difference between the measured values and the reference values for each resource element in a layer. The error vectors for each resource element in the Measurement Interval have been calculated and the values have been plotted above the corresponding subcarrier. The values of the error vectors are usually plotted as a magnitude, but other formats can be chosen as well.

A marker placed on a symbol point reads as shown below:

indicates that Marker 1 is

on subcarrier -5
in the NPDSCH_User02 channel allocation shown in the Composite Include list
on symbol 112
the 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. value at this point is ~1.15%, and the average error over all the resource elements on this subcarrier is ~.44 % (see EVM for more information on how EVM is calculated)