Agilent Technologies E8257D PSG User Manual page 189

Modifying a Predefined I/Q Modulation Type (I/Q Symbols) & Simulating Magnitude Errors & Phase Errors
Use the following procedure to manipulate symbol locations which simulate magnitude and phase
errors. In this example, you edit a 4QAM constellation to move one symbol closer to the origin.
1. Press .
Preset
2. Press >
Mode Custom
> >
I/Q Map QAM 4QAM
This loads a default 4QAM I/Q modulation into the I/Q Values editor.
3. Press .
More (2 of 2)
4. In the I/Q Values editor, navigate to Data 00000000 and press
5. Press >
.235702 Enter
When you press
Enter
entry. The second time, the Q value updates and the highlight moves to the following I entry.
6. Press
Display I/Q Map
Creating an FSK Modulation Type User File with the Frequency Values Editor
Use this procedure to set the frequency deviation for data 00, 01, 10, and 11 to configure a
user–defined FSK modulation.
1. Press .
Preset
2. Press >
Mode Custom
>
Rows Confirm Delete All Rows
This accesses the Frequency Values editor and clears the previous values.
3. Press > .
600 Hz
4. Press > .
1.8 kHz
5. Press > .
–600 Hz
Chapter 6
>
Real Time I/Q Baseband
.
, then > .
.235702 Enter
the first time, the I value updates and the highlight moves to the first Q
. Note that one symbol has moved, as shown.
>
Real Time I/Q Baseband
.
> >
Modulation Type Define User I/Q
> >
Modulation Type Define User FSK
Custom Arb Waveform Generator
Working with Modulation Types
> >
More (1 of 2) Load Default
.
Edit Item
> >
More (1 of 2) Delete All
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