零中频接收机中的载波粗估计  

The coarse carrier estimation in Zero-IF receiver

作　　者：魏苗苗[1] 王竹刚[1,2] 安军社[2] 

机构地区：[1]中国科学院大学,北京100190 [2]中国科学院空间科学与应用研究中心,北京100190

出　　处：《电子设计工程》2016年第17期90-92,共3页Electronic Design Engineering

摘　　要：针对零中频接收机的卫星通信应用,文中首次将频域移位平均周期图法应用于零中频接收机,利用该算法工作信噪比低、估计范围大的优点,扩展了零中频接收机的载波捕获范围,并对算法中补零倍数的定义进行了修改。仿真结果表明,在信噪比大于2 d B,经典高动态模型的通信环境中该算法可使接收机达到90%捕获概率,且捕获时间不大于1.2 s。Focusing on extending the application of Zero-IF receivers on satellite communication, the average periodogram algorithm in frequency domain is used in carrier acquisition process of Zero-IF receivers to extend the acquisition scope. And some parameters of the algorithm are corrected in this paper. The simulation denotes： the algorithm can make sure the Zero-IF receiver＇s acquisition ratio reach 90% when SNR 〉2 dB and Doppler frequency bias and derivate satisfies the classical dynamic model, and the carrier acquisition time is less than 1.2 s.

关 键 词：信号处理 零中频 大频偏 频域移位平均周期图法 FFT 

分 类 号：TN927.21[电子电信—通信与信息系统]