Chapter 2 WCDMA Call Mode
Testing User Equipment on WCDMA channels
52 WCDMA Options Version 6.20
EVM Peak
[%]
Shows the peak value determined for the EVM (Error
Vector Magnitude). The EVM is expressed as a percentage
value.
Note: The error vector can be broken down into a magni-
tude and a phase component; see magnitude and phase
errors below.
Mag. Error
RMS [%]
Shows the RMS value determined for the difference
between the measured vector’s and the ideal vector’s
magnitude, also expressed as a percentage value. The
root mean squared magnitude error is a measurement of
the error in the mobile’s transmit signal size (magnitude)
at the decision points.
Mag. Error
Peak [%]
Shows the peak value determined for the magnitude
error. The value is normalized to the magnitude of the
ideal modulated signal vector and expressed as a per-
centage value.
Phase Error
RMS [deg]
Shows the RMS value determined for the phase differ-
ence, i.e. for the angle difference, between the signal
vector measured and the ideal signal vector. The root
mean squared phase error is a measurement of the phase
component of the vector error of the UE’s transmit signal
at the decision points. It is expressed in degrees.
The phase error RMS value shall not exceed 10°.
Phase Error
Peak [deg]
Shows the peak value for the phase error expressed in
degrees.
The default for the phase error peak value is ±45°.
Rho
Displays the waveform quality factor, a measure of mod-
ulation accuracy. A value of 1 indicates perfect wave-
form quality.
I/Q Offset
[dB]
Shows the I/Q origin offset. The value displayed here is
the determined ratio between the I/Q offset vector and
the average signal vector corrected by offset and is
expressed in dB.
The I/Q offset value shall not exceed –25 dB.
I/Q
Imbalance
[dB]
Shows the I/Q imbalance value, which is a factor for
assessing the accuracy of the I/Q modulator's modulating
signal amplitude balance. It is the ratio of the power in
the desired sideband carrier produced and the undesired
sideband carrier produced due to an amplitude difference
between the input signals to the I/Q modulator,
expressed in dB.
The I/Q imbalance value shall not exceed –15 dB.
Shows the total number of measurements used to
calculate the statistical results.
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