A friend recently showed me an OOK modulation that I had never seen
before, and I’m wondering if anyone knows a name for this scheme.
It is PWM where both the on periods and off periods carry data in their
In the example we observed, an on or off period with a duration of two
units represents a zero. An on or off period with a duration of one
unit represents a one. Example:
This sequence of amplitudes represents the binary data 011101001.
Note that this scheme has a variable data rate. (Two packets carrying
the same number of bits may have different durations.) Overall,
however, the data rate is higher than in a similar looking scheme in
which data are encoded only in the on periods.
Does anyone know what to call this? I am tempted to call it Biphase