Technical data

Chapter 20 605
W-CDMA or W-CDMA (with HSDPA) Over Air
Optional W-CDMA or W-CDMA (with HSDPA) Over the Air Measurement
Settings
W-CDMA or W-CDMA (with HSDPA)
Over Air
Setting the EVM Mode
EVM Mode allows you to select either of the two EVM modes of measurements.
The two modes available to you are
Composite and Pilot.
Select Pilot to measure the EVM of the CPICH channel using Code Number 0 at
Code Level 256. The SCH channels are included in the measurement, giving you a
total of 10 symbols (one time slot).
Select Composite to measure the combined EVM of all the channels.
Setting the IF Equalizer
IF Equalizer allows you to control how you use the test set’s in-built IF Flatness
Equalizer. The IF Equalizer reduces the noise levels of your measurements,
typically resulting in a CDP noise floor reduction of 2 or 3 dB, and an EVM noise
reduction of about one percentage point.
If there is sufficient input power, the IF Equalizer will also remove some of the
multipath channel fading that can be present.
NOTE The noise reduction effect of the IF Equalizer is not immediate, so it is best to allow
4 Set the channel.
a. [Channel]
b. Enter the channel
number using the
numeric keypad.
c. [Enter]
Always enter the channel number even if you have
set Units to Freq.
Step Notes
1[Setup]
2 [EVM Mode] Each time you press this softkey, the
selected option changes.
You can choose between
Pilot and
Composite.
Step Notes