My knowledge of signals and signal processing is limited, so I apologize in advance for my naïve and possibly confusing question.
In the case of BFSK, the frequencies are altered to represent the data (1's and 0's). The frequency transitions are abrupt. You can use Continuous Phase BFSK to "line up" the transitions in frequency.
Now, for my question: lets say I am using BPSK which uses changes in phase to represent the data. If the phase changes from 0 to 180 (or vice versa), wouldn't that have a similar abruptness as BFSK? Is there something I can do, similar to CP BFSK to smooth the transition out?