QAM载波频偏估计的非线性变换分析  

Analysis of Nonlinear Transformation in Frequency Offset Estimation for QAM Signals

作　　者：刘颖[1] 葛临东[1] 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002

出　　处：《信息工程大学学报》2006年第3期271-273,共3页Journal of Information Engineering University

摘　　要：针对一类无数据辅助的非线性最小均方(NLS)载波频偏估计算法进行研究,讨论了其针对QAM信号的应用。通过最小化其估计方差,讨论了其基于信噪比信息的最佳非线性变换,随后给出不同信噪比下的近似算法,同时提出一种中高信噪比下的简化算法,仿真结果表明算法性能比传统的四次方算法有明显的改进。This paper is focusing on study of NDA nonlinear least-squares（NLS） carrier frequency offset estimation for QAM signals. Based on minimization of estimation variance the SNR-based optimal nonlinear transformation is introduced and discussed. Various approximate algorithms for different SNR are derived, and then a simplified transformation for medium and high SNR is presented, which, as simulation results show, could achieve significantly improved performance in comparison with the conventional fourth-power estimation.

关 键 词：载波恢复 频偏估计 非线性变换 QAM信号 

分 类 号：TN914.3[电子电信—通信与信息系统]