基于插值的多普勒频偏和频率斜升联合估计算法

doi:10.3724/SP.J.1146.2012.00716

CORC > 北京大学 > 信息科学技术学院

	基于插值的多普勒频偏和频率斜升联合估计算法; Joint Estimation of Doppler Frequency Shift and Doppler Frequency Rate Based on Interpolation
	蒋伟* ; 乐天
刊名	电子与信息学报
	2013
关键词	卫星移动通信载波同步联合估计多普勒频偏和频率斜升克拉美罗下界 Mobile satellite communication Carrier synchronization Joint estimation Doppler frequency shift and Doppler frequency rate Cramer-Rao Low Bound (CRLB)
DOI	10.3724/SP.J.1146.2012.00716
英文摘要	为解决卫星移动通信系统中突发传输在低信噪比条件下的载波快速同步问题,该文提出一种基于插值的频偏和频率斜升联合估计算法.先通过对多普勒斜升搜索结合低复杂度频偏估计获得频偏和频率斜升的粗估计结果,再以频率斜升粗估计结果为中心、计算3个频率斜升值所对应的对数似然函数并据此对频率斜升进行二次插值以获得频率斜升估计值,最后在该估计值下计算出对应的频偏估计值,完成频偏和频率斜升的联合估计.仿真结果表明,该文算法的信噪比门限较低,估计性能接近克拉美罗下界(CRLB),而且计算复杂度远低于最大似然估计算法,非常适于实际应用.; A joint estimation method of Doppler frequency shift and Doppler frequency rate based on interpolation is proposed for achieving fast carrier synchronization of burst in mobile satellite communication system under the circumstance of low Signal-to-Noise Ratio (SNR). In the proposed method, a coarse estimation of Doppler frequency shift and Doppler frequency rate is achieved first by a Doppler frequency rate searching combined with a traditional low-complexity frequency-estimating algorithm. The log-likelihood function of three Doppler frequency rate testing values, with the coarse estimation result as the center, is calculated and then an interpolation is taken to decide the final estimation of Doppler frequency rate. Finally, the frequency-estimating algorithm is used again to get the final estimation of Doppler frequency shift. Simulation results show that the proposed method has a low SNR threshold and an estimation performance close to Cramer-Rao Low Bound (CRLB). And it has a complexity by far the less than the max-likelihood algorithm and so is very applicable.; EI; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; 1; 166-171; 35
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/184228]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	蒋伟*,乐天. 基于插值的多普勒频偏和频率斜升联合估计算法, Joint Estimation of Doppler Frequency Shift and Doppler Frequency Rate Based on Interpolation[J]. 电子与信息学报,2013.
APA	蒋伟*,&乐天.(2013).基于插值的多普勒频偏和频率斜升联合估计算法.电子与信息学报.
MLA	蒋伟*,et al."基于插值的多普勒频偏和频率斜升联合估计算法".电子与信息学报 (2013).