| 一种LTE-Advanced系统频偏估计中的极性翻转消除方法 |
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| 引用本文： | 贾国庆,陈善继,陈超,纪小红,房卫东.一种LTE-Advanced系统频偏估计中的极性翻转消除方法[J].电信科学,2015,31(8):58-62. |
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| 作者姓名： | 贾国庆 陈善继 陈超 纪小红 房卫东 |
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| 作者单位： | 1. 青海民族大学物理与电子信息工程学院 西宁 810007;2. 中国科学院上海微系统与信息技术研究所 上海 201899 |
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| 基金项目： | 青海省国际科技合作项目;青海省国际科技合作项目;青海省应用基础研究计划基金资助项目 |
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| 摘 要： | 在分数倍频偏（fractional frequency offset，FFO）估计中，噪声和信道衰落的影响可能会导致FFO估计结果的极性翻转，使得FFO估计精度大大降低，OFDM系统的同步性能不可避免地恶化。针对LTE-Advanced系统，设计了一种有效的利用主同步信号（primary synchronization signal，PSS）的镜像对称特性的FFO 极性估计算法，联合基于CP的FFO绝对值估计方法，给出了一种高精度的FFO估计方法。仿真结果表明，所提方法能有效地降低FFO估计精度翻转的问题，保证了同步性能。
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| 关 键 词： | 频率同步 极性翻转消除 LTE-Advanced 下行链路 分数倍频偏 |
A Polarity Reversion Elimination Method for LTE-Advanced Frequency Offset Estimation |
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| Guoqing Jia,Shanji Chen,Chao Chen,Xiaohong Ji,Weidong Fang.A Polarity Reversion Elimination Method for LTE-Advanced Frequency Offset Estimation[J].Telecommunications Science,2015,31(8):58-62. |
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| Authors: | Guoqing Jia Shanji Chen Chao Chen Xiaohong Ji Weidong Fang |
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| Affiliation: | 1. College of Physics and Electronic Information Engineering，Qinghai University for Nationalities，Xining 810007，China;2. Shanghai Institute of Micro-System and Information Technology，Chinese Academy of Science，Shanghai 201899，China |
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| Abstract: | Traditional fractional frequency offset（FFO）estimation algorithm pay less attention to FFO polarity estimation.Noise and channel fading induced FFO estimation polarity reversion degrades the frequency synchronization performance inevitably.An efficient FFO polarity detection method was proposed in LTE-Advanced system to solve the problem，which utilized the mirror symmetry property of time-domain primary synchronization signal（PSS）.Numerical results show that the proposed method can depress FFO polarity reversion efficiently. |
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| Keywords: | frequency synchronization polarity reversion elimination LTE-Advanced downlink fractional frequency offset |
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