Chapter 4 185
Basic Digital Operation
Differential Encoding
Configuring User-Defined I/Q Modulation
1. Press
Preset.
2. Perform the following keypress sequence required for your format type.
For Custom Format
Press
Mode > Custom > Real Time I/Q Base Band > Modulation Type > Define User I/Q >
More (1 of 2) > Load Default I/Q Map > QAM > 4QAM
For TMDA Formats
Press
Mode > Real Time TDMA > desired format > More (1 of 2) > Modify Standard >
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 table 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. Refer to
Figure 4-36.
Figure 4-36
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