| 一种改进的QAM载波恢复方法 |
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| 引用本文： | 李小娟,朱立东.一种改进的QAM载波恢复方法[J].通信技术,2010,43(3):47-48,193. |
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| 作者姓名： | 李小娟 朱立东 |
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| 作者单位： | 电子科技大学通信抗干扰技术国家级重点实验室,四川,成都,610054 |
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| 基金项目： | 国家自然基金科学基金重大项目 |
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| 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。
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| 关 键 词： | QAM 载波恢复 频率检测 相位检测 MWDD算法 |
A Modified Carrier Recovery Algorithm for QAM |
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| LI Xiao-juan,ZHU Li-dong.A Modified Carrier Recovery Algorithm for QAM[J].Communications Technology,2010,43(3):47-48,193. |
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| Authors: | LI Xiao-juan ZHU Li-dong |
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| Affiliation: | LI Xiao-juan ZHU Li-dong (State Key Laboratory of Communication,UESTC,Chengdu Sichuan 610054,China) |
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| Abstract: | 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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| Keywords: | QAM |
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