Final answer:
Switching from polar binary modulation to on-off binary modulation involves changing the signal from having both positive and negative representations for binary '1' and '0' to having the presence or absence of a signal to represent '1' and '0', respectively.
Step-by-step explanation:
Transitioning from polar binary modulation to on-off binary modulation involves a shift in signal representation. In polar binary modulation, binary symbols are represented by two different amplitudes, one for a binary '1' and the other, often opposite in sign, for a binary '0'. This means that the signal is always 'on', conveying a '1' or a '0' at any given time. In contrast, on-off binary modulation uses a simple scheme where a binary '1' is represented by the presence of a signal (the 'on' state) and a binary '0' by the absence of a signal (the 'off' state). Essentially, the changes required for this transition are the elimination of one of the polarities used in polar modulation, resulting in a system where the signal either exists or does not, instead of having positive and negative representations of a binary symbol.