改进线性拟合的调制信号载波频率估计算法  

Improved linear fitting algorithm of modulated signal carrier frequency estimation

作　　者：田克纯[1] 魏丽[1] 丁萌[2] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]南京航空航天大学民航学院,南京210016

出　　处：《计算机应用》2012年第2期374-376,380,共4页journal of Computer Applications

基　　金：广西自然科学基金资助项目(桂科自0832245);南京航空航天大学引进人才基金资助项目(1007-56YAH10047)

摘　　要：为提高基于线性拟合的频率估计算法的抗噪性,根据调制信号的时域特征,在基于最小二乘法的基础上,研究了将随机抽样一致(RANSAC)算法用于载波频率估计。利用RANSAC算法进行直线拟合,来完成调制信号载波频率估计中的参数拟合。以具有单一载波的数字调制方式振幅键控(ASK)和移相键控(PSK)得到的调制信号为研究对象,在Matlab环境下进行仿真实验,结果表明:与基于最小二乘法的方法相比,所提出的载波频率估计方法的误差率明显降低,同时具有较好的抗噪性。To enhance the noise restraint of modulated signal carrier frequency estimation algorithm based on linear fitting, in accordance with the features of modulating signal in the time domain, an estimation algorithm combined with RANdom Sample Consensus （RANSAC） based on least square method was proposed. It regarded modulating signals obtained by Amplitude-Shift Keying （ASK） and Phase-Shift Keying （PSK） which have single carrier frequency as research subjects, and did simulation experiments in Matlab. The experimental results indicate that the method introduced in this paper is better than the method based on least square method in the error rate and noise restraint.

关 键 词：调制信号识别 载波频率估计 随机抽样一致算法 

分 类 号：TN911.6[电子电信—通信与信息系统]