| 摘要 |
<p>A data-directed frequency-and-phase lock loop for an offset-QAM modulated signal comprises a first multiplier (510) that multiplies the signal by the output of a VCO (520). The output of the first multiplier (510) is phase-shifted by a second multiplier (518), then convolved by a third multiplier (530). The output of the third multiplier (530) is split, with each portion being passed through a frequency-shift multiplier and a frequency-and-phase lock loop. The output of the two frequency-and-phase lock loops is summed and returned to the VCO (520) to complete the feedback loop.</p> |
