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Chapter 14 177
1xEV-DO Measurement Application
Measurements
Description Specifications Supplemental Information
Modulation Accuracy (Composite Rho)
−25 dBm ≤ ML
a
≤ −15 dBm
20 to 30 °C
a. ML (mixer level) is RF input power minus attenuation.
For pilot, 2 MAC channels, and 16
channels of QPSK data
Composite EVM
Operating Range 0 to 25% (nominal)
Floor 1.5%
Accuracy
b
b. The accuracy specification applies when the EVM to be measured is well above the measurement floor.
When the EVM does not greatly exceed the floor, the errors due to the floor add to the accuracy errors.
The errors due to the floor are noise-like and add incoherently with the UUT EVM. The errors depend
on the EVM of the UUT and the floor as follows: floorerror = sqrt(EVMUUT
2
+ EVMsa
2
) –
EVMUUT, where EVMUUT is the EVM of the UUT in percent, and EVMsa is the EVM floor of the
analyzer in percent. For example, if the EVM of the UUT is 7%, and the floor is 2.5%, the error due to
the floor is 0.43%.
±1.0
Rho
Range 0.9 to 1.0
Floor 0.999775
Accuracy ±0.0010 dB
±0.0045 dB
At Rho 0.99751 (EVM 5%)
At Rho 0.94118 (EVM 25%)
I/Q Origin Offset
DUT Maximum Offset −10 dBc (nominal)
Analyzer Noise Floor −50 dBc (nominal)
Frequency Error
Range (pilot, MAC, QPSK Data, 8PSK Data)
±400 Hz (nominal)
Accuracy
±10 Hz + tfa
c
c. tfa = transmitter frequency x frequency reference accuracy.