Select Custom BPSK from the Modulation Type drop-down list box.
Right mouse click in the Custom BPSK table or select the Edit menu.
Select 
New items.
Enter the number of
steps
for the pattern.
This modulation type is similar to BPSK but allows for user-defined bit patterns. The step size is automatically determined by the number of state changes indicated by the index number listed in the Custom BPSK table. To add steps (index items) to the table:
Select Custom BPSK from the Modulation Type drop-down list box.
Right mouse click in the Custom BPSK table or select the Edit menu.
Select New items.
Enter the number of
steps
for the pattern.
The figure below shows the four BPSK state changes described in the form above. The parameter, defined as 1/symbol rate, indicates the time duration at each phase state and determines the number of index items occurring during the 800 us pulse width time period for the New Pulse 1 pulse. For trapezoidal and raised-cosine pulse types the modulation is applied only during the duration of the pulse (Width (100%-100%)). For custom profile and custom IQ pulses the modulation is applied from the first point of data through to the last point of data.
