Phase detection method and apparatus for clock signal, and communication device

A phase detection apparatus for a clock signal, comprising:

• a sampling module, configured to sample, according to sampling periods set by a sampling clock, a clock signal of a clock to be detected;
• a phase rough calculation module, configured to obtain, according to a mapping relationship between sampled signals and phase angle values, a phase angle value corresponding to a sampled clock signal in a current sampling period, and subtract a phase difference corresponding to the current sampling period from the phase angle value to obtain an initial phase value of the clock to be detected in the current sampling period, wherein the phase difference is a phase difference between the clock to be detected and the sampling clock in the current sampling period;
• and
• a phase statistics module, configured to obtain, after the sampling ends, a final phase value of the clock to be detected according to initial phase values obtained in respective sampling periods.