Tektronix NetTek YBT250, User Manual

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Appendix A: Specifications
YBT250 Field Transmitter & Interference Tester User Manual
A- 9
Table A- 2: Measurement characteristics (Cont.)
Measurement Description
Error Vector Magnitude (EVM)
(cdmaOne & cdma2000) The normalized RMS of all of the vectors that extend
from the intended constellation points to the actual
symbol points in a record of symbols.
Resolution 0.01%
Accuracy Degradation due to adjacent channel CDMA carriers
(having equivalent power): add 10%.
±
1%; EVM
≤
31%
Residual error: 5% < 1000 MHz
7% < 2000 MHz
Reference Information:
These measurements are accurate for both pilot-only
and in-service CDMA signals.
Error Vector Magnitude (EVM)
(W-CDMA) The normalized RMS of all of the vectors that extend
from the intended constellation points to the actual
symbol points in a record of symbols.
Resolution 0.01%
Accuracy
(W-CDMA composite)
±
2.5%; 12.5%
≤
EVM
≤
22.5%
Residual error: 6% < 1000 MHz
8% < 2500 MHz
Reference Information:
W-CDMA composite refers to a signal with one or more
channels using QPSK modulation or a combination of
QPSK and 16QAM modulation. The EVM measurement
readout displays the EVM for the composite signal.
W-CDMA 3GPP Test Model 4
Accuracy
(W-CDMA EVM16QAM)
±
1.5%; 6.5%
≤
EVM16QAM
≤
22.5%, typical
Residual error: 4%