Patent ID: 6259751
Filing Date: 2001-07-10
Classification: H04B,H04L

Abstract:
A circuit for removing interference in a digital communications system, said circuit comprising:signal processing means for receiving a given signal and for limiting a band of said given signal, thereby providing an output signal;local oscillator means for producing a carrier wave signal;signal mixer means for receiving and mixing said output signal from said signal processing means and said carrier wave signal from said local oscillator means to provide a mixed signal;A/D converter means for receiving and converting said mixed signal to produce a digital signal to be outputted;equalizer means for receiving said digital signal from said A/D converter means and for compensating for distortion of said digital signal to produce a distortion-compensation signal, said equalizer means comprising an adaptive time domain equalizer including four qualifying impulse filters, two of said four qualifying impulse response filters including means for removing interference of a common signal corresponding to a real number composition, and another two of said four qualifying impulse response filters including means for removing interference of an orthogonal phase signal corresponding to an imaginary number composition; andsignal restoring means for receiving said distortion-compensated signal from said equalizer means, and for detecting a phase of said distortion-compensated signal so as to restore said distortion-compensated signal to an original signal.