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Real-Time I/Q Baseband Generator User’s and Programming Guide
2-19
HP ESG Family Signal Generators
Using Functions
Options UN8 and 202
Mapping Symbol Positions with the I/Q Table Editor
Moving an I/Q Symbol
You can manipulate symbol locations to simulate magnitude and phase errors. In this
example, you will edit a 4QAM constellation to move one symbol closer to the origin.
Loading the 4QAM I/Q Map
1. Preset the signal generator, then press the front panel
Mode
key.
2. In the softkey menu, press
Real Time I/Q BaseBand
(if it appears) >
Custom
>
Modulation Type
>
Define User I/Q
>
More (1 of 2)
>
Load Default I/Q Map
>
QAM
>
4QAM
Other Formats:
Real Time I/Q BaseBand
(if it appears) >
TDMA
>
desired format
>
More (1 of 2)
>
Modify Standard
>
Modulation Type
>
Define User I/Q
>
More (1 of 2)
>
Load Default I/Q Map
>
QAM
>
4QAM
The I/Q table editor displays the data for the 4QAM I/Q map.
3. Press
More (2 of 2)
to return to the first page of softkeys.
The following illustration of the I/Q table editor shows the data for a 4QAM I/Q map.
4. Remember that you can view the I/Q map at any time (using
the
Display I/Q Map
softkey, as described in “
on page 2 -16). The figure to the right shows a 4QAM I/Q
constellation.
Summary of Contents for ESG series
Page 2: ...ii ...
Page 446: ...I 16 Index Index ...