Custom Real Time I/Q Baseband

Working with Differential Data Encoding

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.

Data

Symbol Table Offset Values Entry Area

 

 

 

 

Editing the Differential State Map

1.Press 1 > Enter.

This encodes the first symbol by adding a symbol table offset of 1. The symbol rotates forward through the state map by 1 value when a data value of 0 is modulated.

2.Press +/- > 1 > Enter.

This encodes the second symbol by adding a symbol table offset of -1. The symbol rotates backward through the state map by 1 value when a data value of 1 is modulated.

NOTE

At this point, the modulation has one bit per symbol. For the first two data values

 

(00000000 and 00000001) only the last bits (the 0 and the 1, respectively) are

 

significant.

 

 

3.Press 2 > Enter.

This encodes the third symbol by adding a symbol table offset of 2. The symbol rotates forward through the state map by 2 values when a data value of 10 is modulated.

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Chapter 7

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Agilent Technologies E8257C PSG manual Accessing the Differential State Map Editor, Editing the Differential State Map
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E8267C PSG, E8247C PSG CW, E8257C PSG specifications

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