专利名称：Radio receiving apparatus发明人：Takanori Iwamatsu申请号：US09022955申请日：19980212公开号：US06175591B1公开日：20010116
专利附图：
摘要：A radio receiving apparatus regenerates a clock synchronized to a symbol clockcontained in a quadrature demodulated signal obtained by demodulating a multilevelquadrature modulated signal, converts the analog quadrature demodulated signal, atthe 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 foroutputting the slope of an in-phase signal constituting the quadrature demodulatedsignal. A FIR filter constructing the equalizer outputs, as an error signal between inputand output signals of the equalizer, an output signal of the FIR filter which prevails whena center tap coefficient of the filter is regarded as being zero. A clock phase detectoroutputs a phase signal, which conforms to a phase difference between the regeneratedclock 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 thatthe phase difference is eliminated.
申请人：FUJITSU LIMITED
代理机构：Helfgott & Karas, P.C.
更多信息请下载全文后查看
因篇幅问题不能全部显示，请点此查看更多更全内容