N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

Custom Digital Modulation (Option 431)Differential EncodingFor TMDA FormatsPress Mode > ARB Custom Modulation > Single Carrier Setup > Quick Setup (desired format) >Modulation Type > Define User I/Q > More 1 of 2 > Load Default I/Q Map > QAM > 4QAMThis 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 betraversed during the modulation process by the symbol table offset values associated with eachsymbol of data. Refer to Figure 11- 21.Figure 11-21Accessing the Differential State Map Table EditorPress Configure Differential Encoding.This opens the Differential State Map table editor, as shown. At this point, you see the data forthe 1st symbol (00000000) and the cursor prepared to accept an offset value.You are now prepared tocreate a custom differential encoding for the user–defined default 4QAM I/Q modulation. Refer toFigure 11- 22 on page 292.Figure 11-22DataSymbol Table Offset Values Entry Area292 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide