| 共轭对称结构训练符号的多普勒频移估计算法分析 |
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| 引用本文： | 刘立士,刘菲菲,陈雪艳. 共轭对称结构训练符号的多普勒频移估计算法分析[J]. 沈阳理工大学学报, 2012, 31(2): 1-5 |
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| 作者姓名： | 刘立士 刘菲菲 陈雪艳 |
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| 作者单位： | 1. 沈阳理工大学理学院,辽宁沈阳110159;轨道交通控制与安全国家重点实验室(北京交通大学),北京100044
2. 沈阳理工大学理学院,辽宁沈阳,110159 |
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| 基金项目： | 国家自然科学基金资助项目(61101116);轨道交通控制与安全国家重点实验室(北京交通大学)开放课题基金资助;辽宁省博士启动基金课题(20101092);沈阳理工大学青年教师科研启动基金资助 |
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| 摘 要： | 对利用共轭对称结构训练符号进行多普勒频移瞬时值估计的算法性能进行了分析。研究结果表明,在多普勒信道下,该算法具有较高的定时同步精度,并且可以将多普勒频移瞬时值和收、发两端的载波振荡器频偏作为一个整体进行估计,得到准确的估计结果,再进行频偏补偿,从而提高OFDM系统的性能。但在多径-多普勒信道下,该算法的定时估计精度与频偏估计精度较低,很难估计出多普勒频移瞬时值。
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| 关 键 词： | 共轭对称结构 训练符号 多普勒频移 频偏补偿 |
Analysis of the Doppler Frequency Shift Estimation Algorithm Based on Conjugated-symmetrical-structured Training Sequence |
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| LIU Lishi , LIU Feifei , CHEN Xueyan. Analysis of the Doppler Frequency Shift Estimation Algorithm Based on Conjugated-symmetrical-structured Training Sequence[J]. Transactions of Shenyang Ligong University, 2012, 31(2): 1-5 |
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| Authors: | LIU Lishi LIU Feifei CHEN Xueyan |
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| Affiliation: | 1(1.Shenyang Ligong University,Shenyang 110159,China; 2.State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | The instantaneous value of the Doppler frequency shift estimation Based on Conjugated-symmetrical-structured Training Sequence has been studied.The research results show that in the Doppler channel,the two algorithms have a high level of timing synchronization accuracy,and can get accurate estimation results by estimating the instantaneous value of the Doppler frequency shift and the carrier oscillator frequency offset as a whole one,and then make up the frequency offset,and finally improve the performance of the OFDM system.But in the multipath and Doppler channel,the two algorithms’ estimation accuracy of the timing and frequency offset are so low that it will be hard to estimate the instantaneous value of the Doppler frequency shift. |
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| Keywords: | Conjugated-symmetrical-structured training sequence Doppler frequency shift frequency offset correction |
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