Patent ID: 6334203
Filing Date: 2001-12-25
Classification: H04L

Abstract:
An error detecting method for calculating a phase error in a PSK modulated signal having a predetermined modulation phase number, wherein a received phase of the modulated signal is mapped as a point on a complex plane by allocating an inphase signal and a quadrature signal generated from the modulated signal as corresponding to values of the axis of abscissas and the axis of ordinates, and wherein said complex plane is considered divided into a plurality of signal areas based on said predetermined modulation phase number, the method comprising:calculating for each of a received phase of the modulated signal, as mapped to be a point on said complex plane, a plurality of phase errors, each said phase error calculated as being the perpendicular distance of said point from one of a plurality of reference straight lines, wherein said plurality of reference straight lines is derived as a predefined function of said inphase signal and said quadrature signal;discriminating one signal area of said plurality of signal areas to which the received phase is mapped on the basis of the inphase signal and the quadrature signal; andselecting one from the plurality of phase errors calculated above, in accordance with the discriminated signal area.