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Front. Inform. Technol. Electron. Eng.  2010, Vol. 11 Issue (1): 14-26    DOI: 10.1631/jzus.C0910150
    
Blind carrier frequency offset estimation for constant modulus signaling based OFDM systems: algorithm, identifiability, and performance analysis
Wei-yang XU*,1, Bo LU1, Xing-bo HU2, Zhi-liang HONG1
1 Department of Microelectronics, Fudan University, Shanghai 201203, China 2 School of Information Science and Technology, East China Normal University, Shanghai 200241, China
Blind carrier frequency offset estimation for constant modulus signaling based OFDM systems: algorithm, identifiability, and performance analysis
Wei-yang XU*,1, Bo LU1, Xing-bo HU2, Zhi-liang HONG1
1 Department of Microelectronics, Fudan University, Shanghai 201203, China 2 School of Information Science and Technology, East China Normal University, Shanghai 200241, China
 全文: PDF(445 KB)  
摘要： Carrier frequency offset (CFO) estimation is critical for orthogonal frequency-division multiplexing (OFDM) based transmissions. In this paper, we present a low-complexity, blind CFO estimator for OFDM systems with constant modulus (CM) signaling. Both single-input single-output (SISO) and multiple-input multiple-output (MIMO) systems are considered. Based on the assumption that the channel keeps constant during estimation, we prove that the CFO can be estimated uniquely and exactly through minimizing the power difference of received data on the same subcarriers between two consecutive OFDM symbols; thus, the identifiability problem is assured. Inspired by the sinusoid-like cost function, curve fitting is utilized to simplify our algorithm. Performance analysis reveals that the proposed estimator is asymptotically unbiased and the mean square error (MSE) exhibits no error floor. We show that this blind scheme can also be applied to a MIMO system. Numerical simulations show that the proposed estimator provides excellent performance compared with existing blind methods.
关键词： Orthogonal frequency-division multiplexing (OFDM);  Constant modulus (CM);  Carrier frequency offset (CFO);  Blind estimation;  Multiple-input multiple-output (MIMO)    
Abstract: Carrier frequency offset (CFO) estimation is critical for orthogonal frequency-division multiplexing (OFDM) based transmissions. In this paper, we present a low-complexity, blind CFO estimator for OFDM systems with constant modulus (CM) signaling. Both single-input single-output (SISO) and multiple-input multiple-output (MIMO) systems are considered. Based on the assumption that the channel keeps constant during estimation, we prove that the CFO can be estimated uniquely and exactly through minimizing the power difference of received data on the same subcarriers between two consecutive OFDM symbols; thus, the identifiability problem is assured. Inspired by the sinusoid-like cost function, curve fitting is utilized to simplify our algorithm. Performance analysis reveals that the proposed estimator is asymptotically unbiased and the mean square error (MSE) exhibits no error floor. We show that this blind scheme can also be applied to a MIMO system. Numerical simulations show that the proposed estimator provides excellent performance compared with existing blind methods.
Key words: Orthogonal frequency-division multiplexing (OFDM)    Constant modulus (CM)    Carrier frequency offset (CFO)    Blind estimation    Multiple-input multiple-output (MIMO)
收稿日期: 2009-03-14 出版日期: 2009-11-30
CLC:  TN929.5  
基金资助: Project  supported  by  the  Intel  Research  Council  and  the  Applied Materials Shanghai Research & Development Fund (No. 0507)
通讯作者: Wei-yang XU     E-mail: weiyangxu@fudan.edu.cn
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Wei-yang XU, Bo LU, Xing-bo HU, Zhi-liang HONG. Blind carrier frequency offset estimation for constant modulus signaling based OFDM systems: algorithm, identifiability, and performance analysis. Front. Inform. Technol. Electron. Eng., 2010, 11(1): 14-26.

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http://www.zjujournals.com/xueshu/fitee/CN/10.1631/jzus.C0910150    或    http://www.zjujournals.com/xueshu/fitee/CN/Y2010/V11/I1/14

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