| A NOVEL INTEGER FREQUENCY OFFSET ESTIMATOR FOR OFDM |
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| 引用本文： | Cai Xuelian Li Jiandong Li Changle Chen Chen. A NOVEL INTEGER FREQUENCY OFFSET ESTIMATOR FOR OFDM[J]. 电子科学学刊(英文版), 2005, 22(6): 569-574. DOI: 10.1007/BF02687835 |
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| 作者姓名： | Cai Xuelian Li Jiandong Li Changle Chen Chen |
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| 作者单位： | [1]Broadband Wireless Communications Laboratory, Information Science Institute, State Key Laboratory of Integrated Service Networks, Xidian University, Xi＇an 710071, China [2]China.Samsung Telecom R＆D Center, Beijing 100081, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （No.60372048） and Microsoft Research Asia, Key Project of National Natural Science Foundation of China （No.60496316）, National “863” Program of China （No.2005AA123910）, Teaching Research Award Program for 0utstanding Young Teachers in Higher Education Institutions of M0E, P.R.C., and Key Project of Chinese Ministry of Education （No.104171）. |
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| 摘 要： | One of the principal disadvantages of Orthogonal Frequency Division Multiplexing （OFDM） is very sensitive to carrier frequency offset. The integer frequency offset has no effect on the orthogonality among the subcarriers, but it causes a circular shift and phase rotation of the received data symbols sequence, resulting in a Bit Error Rate（BER） of 0.5. In this paper, a novel integer frequency offset estimator for OFDM is derived based on maximum likelihood estimation technique and exploration of the differential relation between two consecutive OFDM data symbol sequences in frequency domain. Its performance is compared with the conventional method by computer simulations for the additive white Gaussian noise channel and a multipath fading channel. Simulation results show that the performance of the proposed estimator is better than the conventional estimator.
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| 关 键 词： | OFDM 正交频分复用技术 整数频率 概率估算 误差估计 |
| 收稿时间： | 2003-11-17 |
| 修稿时间： | 2004-04-20 |
A novel integer frequency offset estimator for OFDM |
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| Xuelian Cai,Jiandong Li,Changle Li,Chen Chen. A novel integer frequency offset estimator for OFDM[J]. Journal of Electronics, 2005, 22(6): 569-574. DOI: 10.1007/BF02687835 |
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| Authors: | Xuelian Cai Jiandong Li Changle Li Chen Chen |
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| Affiliation: | 1. Broadband Wireless Communications Laboratory,Information Science Institute,State Key Laboratory of Integrated Service Networks,Xidian University,Xi'an 710071,China
2. China Samsung Telecom R&D Center,Beijing 100081,China |
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| Abstract: | One of the principal disadvantages of Orthogonal Frequency Division Multiplexing (OFDM) is very sensitive to carrier frequency offset. The integer frequency offset has no effect on the orthogonality among the subcarriers, but it causes a circular shift and phase rotation of the received data symbols sequence, resulting in a Bit Error Rate(BER) of 0.5. In this paper, a novel integer frequency offset estimator for OFDM is derived based on maximum likelihood estimation technique and exploration of the differential relation between two consecutive OFDM data symbol sequences in frequency domain. Its performance is compared with the conventional method by computer simulations for the additive white Gaussian noise channel and a multipath fading channel. Simulation results show that the performance of the proposed estimator is better than the conventional estimator. |
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| Keywords: | Orthogonal Frequency Division Multiplexing (OFDM) Integer frequency offset Maximum likelihood estimation |
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