#### Question 5.8 Question 5.9

## Spectral occupancy for PSK

The bandwidth of a binary PSK signal is identical to that of binary ASK, assuming the same degree of pulse shaping. In fact, BPSK can be viewed as an ASK signal with the carrier amplitudes as +A and –A (rather than +A and 0 for ASK). If the phase changes are abrupt at the symbol boundaries, then, just like FSK, the occupied bandwidth will be much larger than for smooth transitions between phase states, implying the need for shaping of the modulation waveform. |