载波频偏估计复矢量FFT算法研究  

Study on the Algorithm to Estimate Carrier Frequency Deviation with FFT of a Complex Vector

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：《信息工程大学学报》2006年第3期244-247,279,共5页Journal of Information Engineering University

摘　　要：文章基于mPSK调制的正交解调,首先构造一个载波频偏的希尔伯特复矢量,然后根据最大似然参数估计原理,提出一种快速傅里叶变换频偏估计算法。该算法能够精确地检测出载波频偏的绝对值大小和正负方向;当输入端信噪比大于一定门限时,其估计精度与输入端信噪比大小无关。它可应用于中继卫星通信中多普勒频率的捕获跟踪。Structuring a Hibert complex vector of carrier frequency-deviation in the mPSK＇ s demodulation, based on the maximum-likelihood approach and using Fast Fourier Transform, an algorithm for accurately estimating the carrier frequency-deviation of absolute value and polarity is presented, whose precision is independent of the input Signal-to-Noise. It can be used for satellite communications in order to capture and track the Doppler frequency.

关 键 词：卫星通信 载波恢复 希尔伯特变换 MPSK FFT 

分 类 号：TN927[电子电信—通信与信息系统]