| 摘要 |
<p>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 (102) for Hilbert transform filtering I channel data to generate Q channel data which differs in phase from the I channel data, a delayer (100) for delaying the I channel data for a filtering time of the digital filter (102), a reference signal interval processor (104) for receiving the I channel data and generating a reference signal pulse for detecting a slope, an estimation and adaptive decision error detector (106) for receiving the I channel data delayed from the delayer (100) 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 (108) for receiving the decision error signal generated from the estimation and adaptive decision error detector (106) and the Q channel data generated from the digital filter (102), detecting the slope during the detected interval of the reference signal pulse and generating the accumulated slope. <IMAGE></p> |
