| 摘要 |
A circuit and method for adaptively calculating a decision error of a digital signal in a digital modulation system. The circuit includes a digital filter for Hilbert transform filtering I channel data to generate Q channel data which differs in phase from the I channel data, a delayer for delaying the I channel data for a filtering time of the digital filter, a reference signal interval processor for receiving the I channel data and generating a reference signal pulse for detecting a slope, an estimation and adaptive decision error detector for receiving the I channel data delayed from the delayer during a detected interval of the reference signal pulse, deciding symbol data and generating an adaptive decision error signal according to a detected slope, and a slope detector for receiving the decision error signal generated by the estimation and adaptive decision error detector and the Q channel data generated by the digital filter, detecting the slope during the detected interval of the reference signal pulse and generating the accumulated slope.
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