作　　者： ; ; ; ;

机构地区： 东南大学信息科学与工程学院移动通信国家重点实验室

出　　处： 《中国工程科学》 2007年第6期71-76,共6页

摘　　要： 在信道自相关特性的多普勒频偏估计算法的基础上,分析了存在的估计性能不受信噪比和频偏变化影响的最优相关间隔。利用该特性提出一种逐次缩小搜索范围的迭代(CIO,correlation-interval optimized)算法,实现对其搜索和最大多普勒频偏的估计。通过仿真证明理论分析的正确及算法的有效性。与传统基于相关估计算法相比,该算法自适应于信噪比和频偏变化,估计性能基本上独立于信噪比和频偏的变化,实现多普勒频偏的直接性能估计。 In this paper, at first research of relation between correlation-interval and estimation accuracy is carried out, and the optimal correlation-interval is proved to be existent that is adaptive to signal-to-noise ratio and velocity varieties. Then some special characteristics of the optimal correlation-interval are explored. Based on them an iterative correlation-interval optimized （CIO） algorithm is proposed. It optimizes the correlation-interval and calculates the Doppler spread by increasing the resolution on time-domain iteratively. Simulation results show that contrasted to conventional schemes the proposed approach is less sensitive to signal-to-noise ratio and velocity varieties, and can improves the performance dramatically in low signal-to-noise ratio environment in which the conventional schemes has a poor performance. It achieves the high accurate estimation of Doppler spread directly.

关 键 词： 多普勒频偏 自相关 最优化 迭代

领　　域： [电子电信] [电子电信]