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Performance Analysis and Improvement of Phase and Frequency Detector at Low SNR
Author(s): 
Pages: 1-6
Year: Issue:  1
Journal: Acta Electronica Sinica

Keyword:  锁频锁相器科斯塔斯环载波恢复低信噪比;
Abstract: 针对锁频锁相器(Phase and Frequency Detector,PFD)应用于低信噪比、大频偏的条件,通过理论分析和仿真验证阐述了窗口类型对系统频偏捕获速度,范围、噪声门限及相位噪声抖动的影响机理.推导出等效相位噪声功率谱密度的表达式.证明了大窗口具有更低的噪声门限和更小的稳态相位抖动,但捕获速度较慢.为了提高捕获速度,对鉴相器输出值取极性运算得到改进的PFD算法.新算法不仅能增加鉴相增...
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