Comtech EF Data DMD1050TS Installation And Operation Manual page 297

DMD1050TS Satellite Modem Board
Revision 1
Figure I-19. DMD1050TS I/Q for 16APSK 7/8
At this point, changing the noise source level will dynamically change the selected waveforms.
You can simulate fades by attenuating the receive signal to the system.
Appendix I I–19 MN-DMD1050TS