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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2006, Vol. 7 Issue (12): 23-    DOI: 10.1631/jzus.2006.A2104
    
A high performance frequency offset estimator for OFDM
WU Yun, LUO Han-wen, DING Ming, YAN Chong-guang
Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 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.

Key words： OFDM      Frequency offset estimation      Preamble      Chinese residues theorem     
Received: 26 February 2006     
CLC:  TN929.5  
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WU Yun
LUO Han-wen
DING Ming
YAN Chong-guang
Cite this article:

WU Yun, LUO Han-wen, DING Ming, YAN Chong-guang. A high performance frequency offset estimator for OFDM. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(12): 23-.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2006.A2104     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2006/V7/I12/23

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