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PAM radio signal receiver with phase-tracker succeeding adaptive FIR filtering and preceding adaptive IIR filtering
PAM radio signal receiver with phase-tracker succeeding adaptive FIR filtering and preceding adaptive IIR filtering
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机译:具有相位跟踪器的PAM无线电信号接收器,其后接自适应FIR滤波和先前的自适应IIR滤波
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摘要
A PAM receiver for reproducing a baseband signal that symbol codes digital data is combined with an decision-feedback equalizer (DFE) incorporating first adaptive digital filtering as a feed-forward element and second adaptive digital filtering as a feedback element. The DFE response is supplied to symbol decoding circuitry for reproducing the digital data. A de-rotator re-samples the first adaptive digital filtering response before it is combined with the second adaptive digital filtering response to generate an equalizer response. The resulting baud-rate equalizer response is sampled at baud rate and quantized to generate baud-rate decisions that applied to the second adaptive digital filtering as input signal, for completing the decision-feedback loop. The re-sampling of the first adaptive digital filtering response by the de-rotator is controlled, so as to provide a phase-tracker that reduces phase noise and intersymbol interference, prior to the making of decisions for decision feedback.
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