| A high performance frequency offset estimator for OFDM |
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| 作者姓名： | WU Yun LUO Han-wen DING Ming YAN Chong-guang |
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| 作者单位： | [1]Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China [2]Shanghai Sharp Advaneed R＆D Centre, Sharp Electronics Co., Ltd, Shanghai 201206, China |
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| 基金项目： | Project supported by the Hi-Tech Research and Development Pro-gram (863) of China (No. 2003AA12331007) and the National NaturalScience Foundation of China (No. 60572157) |
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| 摘 要： | INTRODUCTION Orthogonal frequency division multiplexing (OFDM) has become a promising technology for future wireless communication systems (Kim et al., 2003; 3GPP TSG-RAN-1.TR, 2004) due to its ability to transform a wideband frequency selective channel to a set of parallel flat-fading narrow-band channels, which substantially simplifies the channel equaliza- tion problem. However, a critical weakness of OFDM is its sensitivity to carrier frequency offset (CFO) since it can only t…
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| 关 键 词： | OFDM 频率偏离估值 前同步码 估计范围 |
| 收稿时间： | 2006-02-26 |
| 修稿时间： | 2006-09-03 |
A high performance frequency offset estimator for OFDM |
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| WU Yun LUO Han-wen DING Ming YAN Chong-guang.A high performance frequency offset estimator for OFDM[J].Journal of Zhejiang University Science,2006,7(12):2104-2109. |
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| Authors: | Yun Wu Han-wen Luo Ming Ding Chong-guang Yan |
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| Institution: | (1) Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;(2) Shanghai Sharp Advanced R&D Centre, Sharp Electronics Co., Ltd, Shanghai, 201206, China |
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| Abstract: | This paper proposes a simple method to enlarge the estimation range of conventional carrier frequency offset (CFO) estimation methods based on correlations among the identical parts of the preamble. A novel preamble is designed, which is composed of one regular OFDM training block with even numbers of identical parts and one irregular OFDM training block with odd numbers of identical parts. The initial estimates obtained over the two training blocks are next exploited to jointly estimate the CFO. By elaborately selecting the numbers of identical parts for the two training blocks, the proposed CFO estimator can estimate frequency offset over tens of the subcarrier spacing. Simulation results showed that the proposed CFO estimator satisfies the estimate range requirement for the practical OFDM systems, while achieving a very good estimate performance. |
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| Keywords: | OFDM Frequency offset estimation Preamble Chinese residues theorem |
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