Agilent Technologies ESG series, User And Programming Manual, Page: 46 / 446

2-18 Real-Time I/Q Baseband Generator User’s and Programming Guide
Using Functions HP ESG Family Signal Generators
Mapping Symbol Positions with the I/Q Table Editor Options UN8 and 202
1. Note that the entry under
I Value
is highlighted. Use the numeric keypad to type the
first I value from the table on page 2-17 . You do not have to type the leading zero, or the
zeros that follow the number 5.
As you press the keys, the numbers display in the active entry area (if you make a
mistake, use the backspace key and then retype).
2. To accept the value, press the
Enter
softkey. Note that the I value updates, the highlight
moves to the first Q entry (and provides a default value of 0), and an empty row of data
appears below the first row.
Also note that
0.000000
appears as the first entry in the list of Distinct Values, and
that
0.500000
appears as the second entry.
NOTE
The maximum number of distinct (unique) values that can appear in any
I/Q map is 16. This is not the maximum number of I/Q entries; this is simply
the maximum number of distinct values that you can use to create the
entries. For example, if you load the default 256QAM map, you will see that
16 distinct values have been used to create far more than 16 I/Q entries.
3. For the first
Q Value
, type 1, then press
Enter
. The Q value
updates, and the highlight moves to the second I value. Now
0.500000
and
1.000000
are listed as the distinct values.
4. Enter the remaining I and Q values. Remember that you can
view the I/Q map at any time (using the
Display I/Q Map
softkey, as described in “ Clearing Data ” on page 2 -16). The
figure to the right shows a completed constellation.
Storing the I/Q Map to Memory
Now that you have created a customized I/Q map, you can save it for future use. See
“
Storing User-Defined Files to Memory ” on page 2-33.