Chapter 4 187
Basic Digital Operation
Differential Encoding
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.
4. Press
0 > Enter.
This encodes the fourth symbol by adding a symbol table offset of 0. The symbol does 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.
Applying Custom Differential Encoding
Press
Return > Differential Encoding Off On.
This applies the custom differential encoding to a user-defined modulation.
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 is purged when you press
the
Confirm Exit From Table Without Saving softkey when exiting from the I/Q or FSK table
editor.
To Next Page
Loading...
Need help?
General
