| 摘要 |
A radio receiving apparatus regenerates a clock synchronized to a symbol clock contained in a quadrature demodulated signal obtained by demodulating a multilevel quadrature modulated signal, converts the analog quadrature demodulated signal, at the timing at which the regenerated clock occurs, to digital data and outputs the digital data via a transversal equalizer. The apparatus includes a slope discriminator for outputting the slope of an in-phase signal constituting the quadrature demodulated signal. A FIR filter constructing the equalizer outputs, as an error signal between input and output signals of the equalizer, an output signal of the FIR filter which prevails when a center tap coefficient of the filter is regarded as being zero. A clock phase detector outputs a phase signal, which conforms to a phase difference between the regenerated clock and the symbol clock, using the slope and the error signal, and a clock regenerating circuit generates a clock based upon the phase signal in such a manner that the phase difference is eliminated.
|
