3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
BT
This control enables you to determine the filter characteristics of the Gaussian filter
used by the analyzer's digital demodulator.
Remote Command
[:SENSe]:EVM:FILTer:BT <real>
[:SENSe]:EVM:FILTer:BT?
Example
:EVM:FILT:BT 0.5
:EVM:FILT:BT?
Dependencies This control is available for the Gaussian filter only
Preset 0.6
State Saved Yes
Min/Max 0.05/100
Advanced Demod Setup
The Advanced Setup control enables you to access advanced demodulation
parameters on one screen.
Equalizer
This control enables you to turn the adaptive equalization filter on or off. The
adaptive equalization uses the measured signal to determine the coefficients of the
equalization filter.
When equalization is on, the equalization filter has a unit impulse response. The
length of the filter determines the position of the unit impulse response in the filter.
The impulse is located in the center of the filter for short filter lengths. As the filter
length increases, the impulse moves, proportionally, towards the start of the filter to
handle channels with a large delay-spread.
Note that the analyzer does not redefine the equalization filter to have a unit impulse
response when you select on or when you turn the equalization filter off and then on;
instead, the analyzer uses the last updated filter coefficients.
Equalization is applied to time-domain data. For best results, make sure you select a
frequency span that contains all the energy of your signal. If significant energy from
your signal falls outside of the displayed frequency span, equalization will not work
on your signal.
You can define the length of the equalization filter (in symbols) and set the
convergence (convergence determines the size of the steps used to reshape the
equalization filter). For additional details about these parameters, see"Convergence"
on page 282 and "Filter Length" on page 281.
280 Short Range Comms & IoT Mode User's &Programmer's Reference
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