Keysight WLAN Measurement Guide 65
Making WLAN Measurements
Making Modulation Analysis Measurements
Once this has been done, you can save the settings in a file for later recall and
reuse.
Optimizing Equalizer Training Setting
Changing the Equalizer Training from using only the preamble to using the
preamble, pilots, and data may improve EVM measurements. Press
Meas
Setup
,
More
,
Ad vanced
,
Eq Training
, and select
Channel Est Seq & Data
.
Calculating the maximum search length for multi-burst signals
WLAN signals in time domain vary in length and spacing. The maximum search
time length is dependent on IF bandwidth of hardware, using the following
equation to calculate the maximum search length for multi-burst signals:
1.
Turn on the IF Gain.
a.
Press
Meas Setup
,
Ad vanced
,
More
,
IF
Gain
, and select
High
Gain
.
b.
Adjust the
Mech Atten
setting, if needed.
This adds 10 dB of gain to the signal.
For signals with power level around -40 dBm
1.
Switch the IF Gain to
Low Gain.
a. Press
Meas Setup
,
Ad vanced
,
More
,
IF Gain
,
and select
Low Gain
.
2.
Turn on the preamplifier.
a.
Press
AMPTD
,
More
,
Internal Preamp
,
Full
Range
.
b.
Adjust the
Mech Atten
setting, if needed.
The attenuation settings can be used to lower
the power if the preamplifier causes an input
overload.
For signals with power level around -50 dBm or less
1.
Switch the IF Gain to
High Gain.
a. Press
Meas Setup
,
Ad vanced
,
More
,
IF Gain
,
and select
High Gain
.
2.
Turn on the preamplifier.
a. Press
AMPTD
,
More
,
Internal Preamp
,
Full
Range
.
Get the maximum input to the ADC.
Steps
Action
Notes
When IF Gain setting to Auto, the process may take more time. To achieve
faster measurements, you need to manually set the IF Gain to "High Gain"
or "Low Gain".