一种高精度载波频偏复矢量FFT检测方法  

A High Precise Method to Measure Carrier Frequency-deviation Complex Vector with FFT

作　　者：陈大夫[1] 张尔扬[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《北京电子科技学院学报》2006年第2期41-45,共5页Journal of Beijing Electronic Science And Technology Institute

摘　　要：载波恢复中高精度的频偏检测与跟踪是高性能锁相位环路实现的必要条件。本文首先构造一对有关载波频偏的希尔伯特复信号,再基于最大似然参数估计,提出一种复矢量快速傅里叶变换的频偏估计方法,该方法可精确地检测出载波频偏的绝对值大小和正负方向。该方法的精确度与输入端信噪比大小无关,而只与频偏检测器FPGA实现模块的设计参数有关。High precise measuring and tracking of carrier frequency-deviation is necessary to the realization of a high performance phase locked loop in carrier recovery. In this paper, we construct a Hilbert complex vector of carrier frequency-deviation. Based on the maximum-likelihood approach, we use fast Fourier transformation to present a method for accurately measuring the carrier frequency-deviation of its absolute value and polarity. Its precision is independent of the input Signal-to-Noise, and only relates to the design-parameter on FPGA＇s implement.

关 键 词：MPSK 载波频偏 希尔伯特变换 FFT 

分 类 号：TN911.72[电子电信—通信与信息系统]