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Chpater 6 157
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
0001 0100 (20) 4 times
0001 1000 (24) 8 times
0011 0000 (48) 4 times
0011 0100 (52) 4 times
0011 1000 (56) 4 times
0101 1000 (88) 8 times
0111 0000 (112) 4 times
0111 0100 (116) 4 times
0111 1000 (120) 8 times