自适应最优相关间隔选择的多普勒频偏估计算法

张彭,毕光国,曹秀英,袁晓辉

中国工程科学 ›› 2007, Vol. 9 ›› Issue (6) : 71 -76.

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中国工程科学 ›› 2007, Vol. 9 ›› Issue (6) : 71 -76.

自适应最优相关间隔选择的多普勒频偏估计算法

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Adaptive Optimization of Correlation-Interval for DopplerSpread Estimation and Its Iterative Implement

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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唱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。

Abstract

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

Key words

Doppler spread / autocorrelation / optimization / iteration

Author summay

张彭(1976-),男,陕西西安市人,东南大学移动通信国家重点实验室博士生,研究方向为移动通信中的信道估计与自适应接收技术

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张彭,毕光国,曹秀英,袁晓辉 自适应最优相关间隔选择的多普勒频偏估计算法[J]. 中国工程科学, 2007, 9(6): 71-76 DOI:

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