Continuous-phase high compaction multicarrier-modulation (CPPC/HC-MCM) according to the present application uses a continuous phase modulation (CPM) technique to prevent an amplitude gap between two continuous signals, thereby improving characteristics of the conventional PC/HC-MCM in terms of effective use of a frequency bandwidth. The CPPC/HC-MCM can achieve a lower bit error rate (BER) for a wide signal-to-noise ratio at a common spectral efficiency of about 0.33 or less, as compared to the conventional unmodulated PC/HC-MCM.