198 Chapter 7
Custom Real Time I/Q Baseband
Working with Differential Data Encoding
Configuring User–Defined I/Q Modulation
1. Press
Preset.
2. Press
Mode > Custom > Real Time I/Q Baseband > Modulation Type > Define User I/Q > More (1 of 2) > Load Default
I/Q Map
> QAM > 4QAM.
This loads a default 4QAM I/Q modulation and displays it in the I/Q Values editor. The default 4QAM
I/Q modulation contains data that represent 4 symbols (00, 01, 10, and 11) mapped into the I/Q
plane using 2 distinct values (1.000000 and −1.000000). These 4 symbols will be traversed during the
modulation process by the symbol table offset values associated with each symbol of data.
Accessing the Differential State Map Editor
• Press
Configure Differential Encoding.
This opens the Differential State Map editor. At this point, you see the data for the 1st symbol
(00000000) and the cursor prepared to accept an offset value. You are now prepared to create a
custom differential encoding for the user–defined default 4QAM I/Q modulation.
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