Agilent Technologies ESG series, User And Programming Manual

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Real-Time I/Q Baseband Generator User’s and Programming Guide 2-21
HP ESG Family Signal Generators Using Functions
Options UN8 and 202 Mapping Symbol Positions with the I/Q Table Editor
Globally Replacing an I/Q Value
When you want to change an I/Q value throughout the entire table, you can change the
value once and have all occurrences of that value change to the new value. In this example,
you will use the
Globally Replace Selected Item
command to globally replace I/Q values.
NOTE When using the
Globally Replace Selected Item
command, be sure that you
want all occurrences of the selected value changed. Also, consider the order in
which you change values. For example, if you want to change all current 0.5
values to 1.0, and all current 1.0 values to –0.75, change the 1.0 values first,
or all values will end up as –0.75.
1. Load a 4QAM I/Q map into the table editor as described on page 2-19 .
2. Select any occurrence of the value
1.000000
, then select the softkey
Globally Replace Selected Item
.
3. Using the numeric keypad, type
0.5
, then press the
Enter
softkey.
Note that all entries in the table that were originally
1.000000
now read
0.500000
.
4. Select any occurrence of the value
-1.000000
, then press the softkey
Globally Replace Selected Item
.
5. Using the numeric keypad, type
-0.5
, then press the
Enter
softkey.
Note that all entries in the table that were originally
-1.000000
now read
-0.500000
.
6. In the softkey menu, press
Display I/Q Map
. Note that you have moved all of the symbols,
as shown below.
Storing the I/Q Map to Memory
As described in “ Storing User-Defined Files to Memory ” on page 2-33, you can save this
modified map for future use (
Load/Store
>
Store To File
).