Adaptive receiver capable of achieving both of matched filtering function and carrier recovery function

An adaptive receiver comprising:

• a matched filter for filtering an input signal into a primary filtered signal in accordance with a plurality of tap coefficients;
• a decision-feedback equalizer connected to said matched filter for producing a decision signal in response to said primary filtered signal, said decision signal being defined by orthogonal coordinates;
• a decision signal converting circuit connected to said decision-feedback equalizer for carrying out polar coordinate conversion to convert said decision signal into a converted decision signal defined by polar coordinates;
• a complex conjugate calculator supplied with said input signal for calculating complex conjugate of said input signal to produce a calculated input signal representative of said complex conjugate;
• an input delay circuit connected to said complex conjugate calculator for giving a predetermined delay to said calculated input signal to produce a delayed input signal having said predetermined delay, said delayed input signal being defined by said orthogonal coordinates;
• and
• processing means connected to said decision signal converting circuit and said input delay circuit for processing said converted decision signal and said delayed input signal to produce a plurality of tap coefficient signals representative of said plurality of tap coefficients;
• said processing means comprising:
• dividing means connected to said decision signal converting circuit for dividing said converted decision signal into zeroth through N-th divided signals where N represents a positive integer greater than unity;
• delaying means connected to said input delay circuit for delaying said delayed input signal to produce first through N-th delayed signals which have first through N-th delays different from one another;
• polar coordinate converting means connected to said input delay circuit and said delaying means for carrying out polar coordinate conversion to convert said delayed input signal and said first through said N-th delayed signals defined by said orthogonal coordinates into zeroth through N-th converted input signals, respectively, which are defined by said polar coordinates;
• correlation means connected to said dividing means and said polar coordinate converting means for calculating zeroth through N-th correlation coefficients between said zeroth through said N-th divided signals and said zeroth through said N-th converted input signals, respectively, said correlation means producing zeroth through N-th correlation signals indicative of said zeroth through said N-th correlation coefficients, respectively, said zeroth through said N-th correlation signals being defined by said polar coordinates;
• and
• orthogonal coordinate converting means connected to said correlation means for carrying out orthogonal coordinate conversion to convert said zeroth through said N-th correlation signals into zeroth through N-th converted orthogonal signals which are defined by said orthogonal coordinates, said zeroth through said N-th converted orthogonal signals being supplied to said matched filter as said plurality of tap coefficient signals.