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中文摘要：
文中提出了一种新的QAM载波恢复环路结构。在此结构中频率检测和相位检测同时进行,在鉴相阶段引入了改进的加权直接判决（MWDD）算法。经仿真实验验证此方法提高了整个载波恢复环路的捕获速度,并使载波环路的相位抖动有所减小,16-QAM载波环路最大可以捕获11%符号率的频偏。
英文摘要：
A new structure of carrier recovery loop for QAM systems is proposed in this paper.In this structure,frequency detection and phase detection are carried out simultaneously.Meanwhile,a modified weighting decision-directed（MWDD）algorithm is adopted in phase detection period.Simulation indicates that the algorithm could improve the capture speed of carrier recovery loop and reduce the frequency flicker.The 16-QAM circuit could capture up to 11% frequency offset of the symbol rate.
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