Agilent Technologies E8267D PSG - Manual (Page 187)

Chapter 6 173
Custom Arb Waveform Generator
Working with Modulation Types
5. Press the Delete Row softkey 16 times.
Repeat this pattern of steps using the following table:
6. Press Display I/Q Map to view the new constellation that has been
created. The I/Q State Map in this example has 128 symbols.
7. Press Return . When the contents of an I/Q Values table have not
been stored, I/Q Values (UNSTORED) appears on the display.
8. Press More (1 of 2) > Load/Store > Store To File .
If there is already a file name from the Catalog of IQ Files
occupying the active entry area, press the following keys:
Editing Keys > Clear Text
9. Enter a file name (for example, 128QAM) using the alpha keys
and the numeric keypad.
10. Press Enter .
The user–defined I/Q State Map should now be stored in the Catalog of IQ Files.
Creating a QPSK I/Q Modulation Type User File with the I/Q Values Editor
In I/Q modulation schemes, symbols appear in default positions in the I/Q plane. Using the I/Q
Values
editor, you can define your own symbol map by changing the position of one or more
symbols. Use the following procedure to create and store a 4–symbol unbalanced QPSK modulation.
1. Press Preset .
Goto Row ... Press the Delete Row softkey...
0110 0000 (96) 16 times
1001 0000 (144) 16 times
1100 0000 (192) 16 times
0001 0000 (16) 4 times
 (20) 4 times
 (24)
8 times
 (48) 4 times
 (52) 4 times
 (56)
4 times
 (88) 8 times
 (112)
4 times
 (116)
4 times
 (120) 8 times