Real-Time I/Q Baseband Generator User’s and Programming Guide
2-13
HP ESG Family Signal Generators
Using Functions
Options UN8 and 202
Mapping Custom Differential Encoding
NOTE
Notice that
(UNSTORED)
appears next to
Differential State Map
on the
signal generator’s display. Differential state maps are associated with the
user-defined modulation for which they were created. In order to save a
custom differential state map, you must store the user-defined modulation for
which it was designed. Otherwise the symbol table offset data will be purged
when you press the
Confirm Exit From Table Without Saving
softkey when
exiting from the I/Q or FSK table editor.
2. To encode the second symbol, add a symbol table offset of
−
1 by pressing
+/-
>
1
>
Enter
.
This will rotate 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. To encode the third symbol, add a symbol table offset of 2 by pressing
2
>
Enter
. This
will rotate forward through the state map by 2 values when a data value of 10 is
modulated.
4. To encode the fourth symbol, add a symbol table offset of 0 by pressing
0
>
Enter
. This
will not rotate through the state map when a data value of 11 is modulated.
NOTE
At this point, the modulation has two bits per symbol. For the data values
00000000, 00000001, 00000010, 00000011, the symbol values are 00, 01, 10,
and 11 respectively.
5. Press
Return
to go back to the I/Q table editor.
Summary of Contents for ESG series
Page 2: ...ii ...
Page 446: ...I 16 Index Index ...
