6-14
Real-Time I/Q Baseband Generator User’s and Programming Guide
Theory of Operation
ESG Family Signal Generators
Understanding Differential Encoding
Options UN8 and 202
0011100001 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.
Data Value
Symbol Table Offset
00
01
10
11
+1
-1
+2
+0
Data = 0011100001
{
{
{
{
{
5th Symbol
1st Symbol
3rd Symbol
4th Symbol
2nd Symbol
1st
2nd
3rd
5th
4th
Summary of Contents for ESG series
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