本文題出一種新的結合頻率和相角的調變: L個相角同調頻率/相位調變(L-phase-level Coherent Frequency/Phase Modulation Scheme,簡稱LCFPM),並和傳統結合頻率和相角的調變如NFSK/LPSK和NQFPM從功率和頻寬效能作一比較 L-phase-level Coherent FRqeency/Phase Modulation (LCFPM), a newly-developed modulated scheme, is investigated in this dissertation, which is analyzed on spectral characteristic and power characteristic on the additive white Gaussian noise channel. Comparison with conventional joint frequency and phase modulations is also conducted in terms of power and bandwidth efficiencies.