本文在简要叙述调制解调方式后,对造成8φ—DPSK 4800bpsmodem系统相位误差的因素及影响程度给出了定性或定量的分析与讨论,最后对系统相位误差指标进行了粗略的分配 After a brief description of the modulation and demodulation methods, this paper gives a qualitative or quantitative analysis and discussion on the factors contributing to the phase error of the 8φ-DPSK 4800bpsmodem system. Finally, the system phase error index is roughly allocated