R&S
®
CMW 500 WiMAX Applications
WiMAX GUI Reference
Operating Manual 1202.3986.32 – 03 384
WiMAX Multi Evaluation measurement results
The following modulation results of the WiMAX multi-evaluation measurement are
analogous to the results discussed in section Modulation Accuracy, however, the
formulas are modified to account for the necessary averaging over subcarriers and
symbols.
Error Vector Magnitude (EVM)
The Error Vector Magnitude for each subcarrier k and symbol l is the normalized
magnitude of the error vector:
The individual EVM values are RMS-averaged in order to obtain average EVM values
(in percent) for the pilot symbols, the data symbols, and all symbols in the measured
burst:
The EVM percentage values are converted into dB values in the usual way:
EVM [dB] = 20 log EVM [%],
which, owing to the percentage of pilot symbols in the uplink burst (2* K_Pilot =
K_Data) results in the relation:
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