| 移动通信中的多谱勒频偏估计方法 |
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| 引用本文： | 华惊宇,尤肖虎.移动通信中的多谱勒频偏估计方法[J].东南大学学报,2004,20(4):405-411. |
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| 作者姓名： | 华惊宇 尤肖虎 |
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| 作者单位： | 东南大学移动通信国家重点实验室，南京210096 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 针对几种多普勒频偏估计方法,分别为对数包络法、自相关函数法、各阶电平通过率法和均方相位差分法,在理论上分析了瑞利信道中它们的估计原理和估计偏差,说明了这些估计方法各自的适用场合.同时推导了多普勒频偏估计器的CRB (Cramer Rao bound),并且提出了一种新的利用二阶多项式拟合的修正方法以提高多普勒频偏估计精度.算法验证采用门特卡罗计算机仿真,结果表明,相对于原始估计方法,拟合修正后的方法估计性能得到了较大的提高.
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| 关 键 词： | 多普勒频偏 后三代 (B3G) |
Doppler shift estimation methods in mobile communication systems |
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| Hua Jingyu You Xiaohu.Doppler shift estimation methods in mobile communication systems[J].Journal of Southeast University(English Edition),2004,20(4):405-411. |
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| Authors: | Hua Jingyu You Xiaohu |
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| Abstract: | Several Doppler shift estimators, including mean logarithm envelope difference(MLED) method, auto-correlation function (ACF) method, zero crossing rate (ZCR) method and mean square phase difference (MSPD) method are discussed and compared. The estimation principle and theoretical estimation bias of these estimators under Rayleigh fading channels are analyzed; furthermore, the Cramer Rao bound (CRB) of Doppler shift estimation is deduced, and a novel modification method based on two-dimensional polynomial fitting is proposed to reduce the Doppler shift estimation bias. We verify our algorithms with the Monte Carlo computer simulation; simulation results show better variance performance of modified methods than those of the original methods. In addition, the applicable situations of these estimators are discussed. |
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| Keywords: | CRB Doppler shift beyond the third generation (B3G) Cramer Rao bound |
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