Patent ID: 8804877

Claim:
A phase error correcting apparatus, applied to a phase-shift keying communication system, the apparatus comprising: an error estimating module, for receiving a phase-shift keying signal comprising an original signal and a noise signal, and calculating a phase error caused by the noise signal according to the phase-shift keying signal and a plurality of candidate signals using Bayesian estimation; wherein the original signal represents one of the plurality of candidate signals; and a correcting module, for correcting the phase-shift keying signal according to the phase error, wherein the error estimating module associates a quadratic of a difference of the original signal and an estimated signal corresponding to the phase-shift keying signal to a Bayesian risk, and calculates the phase error toward minimizing the Bayesian risk, in a way that a phase difference of the corrected phase-shift keying signal and the original signal is minimized.