| 摘要 |
<p>A data-and-pilot directed frequency-and-phase lock loop for an offset-QAM modulated signal having a pilot signal comprises a pilot acquisition loop and a pair of data-directed acquisition loops. The pilot is extracted from the main signal by a pilot filter, then used both by the pilot acquisition loop and to remove the pilot from the signal to the data-directed acquisition loops. The outputs of the pilot and the two data-directed acquisition loops are summed and returned to the VCO to complete the feedback loop.</p> |
