Patent ID: 6236690
Filing Date: 2001-05-22
Classification: H03D,H04B

Abstract:
A direct-conversion receiver comprising:a local oscillator for generating a local oscillator signal;means for converting a received radio signal into a pair of a baseband I signal and a baseband Q signal in response to the local oscillator signal;a demodulator for demodulating the pair of the baseband I signal and the baseband Q signal into a demodulation-resultant signal which is neither an I signal nor a Q signal;means for detecting a difference between a frequency of the local oscillator signal and a frequency of a carrier of the received radio signal;a clock signal generator for generating a first clock signal providing a timing which corresponds to a center of a symbol period;a signal delay device for delaying the first clock signal in response to the detected frequency difference, and thereby converting the first clock signal into a second clock signal; andmeans for deciding a logic state of the demodulation-resultant signal at a timing determined by the second clock signal.