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132 Chapter 3
Basic Digital Operation
Differential Encoding
appear in the following illustration.
As you can see from the previous illustration, the 1st and 4th symbols, having the same data
value (00), produce the same state transition (forward 1 state). In differential encoding,
symbol values do not define location; they define the direction and distance of a transition
through the I/Q State Map.
For instructions on configuring differential encoding, see “Using Differential Encoding” on
page 132.
Using Differential Encoding
Differential encoding is a digital-encoding technique that denotes a binary value by a signal
change rather than a particular signal state. It is available for custom real-time I/Q baseband
generator waveforms and real-time I/Q baseband generator TDMA waveforms. It is not
available for waveforms generated by the dual arbitrary waveform generator.
The signal generator’s Differential State Map table editor enables you to modify the
differential state map associated with user-defined I/Q and user-defined FSK modulations. In
this procedure, you create a user-defined I/Q modulation and then configure, activate, and
apply differential encoding to the user-defined modulation. For more information, see
“Differential Encoding” on page 128.
Data Value Symbol Table Offset
00
01
10
11
+1
-1
+2
+0
Data = 0011100001
{
{
{
{
{
5th Symbol1st Symbol
3rd Symbol
4th Symbol
2nd Symbol
1st
2nd
3rd
5th
4th
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