Patent ID: 6442383
Filing Date: 2002-08-27
Classification: H03D,H04B,H04L

Abstract:
A demodulator for use with a digital wireless communication system, comprising:a DC offset controller for removing a DC offset of a modulated signal that is input to the demodulator; a complex multiplying unit for complex-multiplying an output signal of said DC offset controller; a phase detector for detecting an amplitude error signal and a phase error signal from an output signal of said complex multiplying unit; an LPF (low pass filter) for outputting a low band component of the phase error signal; and an NCO (numerical controlled oscillator) for converting an output signal of said LPF into a sin component and a cos component that have orthogonal relation, wherein the sin component and the cos component are input to said complex multiplying unit, and wherein the amplitude error signal, the sin component, and the cos component are input to said DC offset controller.