A Novel Estimation Method for Integer Frequency Offset in Wireless OFDM Systems
Ren et al. presented an efficient carrier frequency offset
(CFO) estimation method for orthogonal frequency division multiplexing
(OFDM), which has an estimation range as large as the
bandwidth of the OFDM signal and achieves high accuracy without
any constraint on the structure of the training sequence. However,
its detection probability of the integer frequency offset (IFO) rapidly
varies according to the fractional frequency offset (FFO) change. In
this paper, we first analyze the Ren-s method and define two criteria
suitable for detection of IFO. Then, we propose a novel method for
the IFO estimation based on the maximum-likelihood (ML) principle
and the detection criteria defined in this paper. The simulation results
demonstrate that the proposed method outperforms the Ren-s method
in terms of the IFO detection probability irrespective of a value of
the FFO.
[1] R. V. Nee and R. Prasad, OFDM for Wireless Multimedia Communications.
London, England: Artech House, 2000.
[2] M. Morelli, C.-C. J. Kuo, and M. O. Pun, "Synchronization techniques
for orthogonal frequency division multiple access (OFDMA): A tutorial
review," Proc. IEEE, vol. 95, no. 7, pp. 1394-1427, July 2007.
[3] P. H. Moose, "A technique for orthogonal frequency division multiplexing
frequency offset correction," IEEE Trans. Commun., vol. 42, no. 10, pp.
2908-2914, Oct. 1994.
[4] T. M. Schmidl and D. C. Cox, "Robust frequency and timing synchronization
for OFDM," IEEE Trans. Commun., vol. 45, no. 12, pp. 1613-1621,
Dec. 1997.
[5] M. Morelli and U. Mengali, "An improved frequency offset estimator for
OFDM applications," IEEE Commun. Lett., vol. 3, no. 3, pp. 75-77, Mar.
1999.
[6] A. Laourine, A. St'ephenne, and S. Affes, "A new OFDM synchronization
symbol for carrier frequency offset estimation," IEEE Signal Process.
Lett., vol. 14, no. 5, pp. 321-324, May 2007.
[7] G. Ren, Y. Chang, H. Zhang, and H. Zhang, "An efficient frequency offset
estimation method with a large range for wireless OFDM systems," IEEE
Trans. Vehic. Technol., vol. 56, no. 4, pp. 1892-1895, July 2007.
[8] A. Milewski, "Periodic sequences with optimal properties for channel
estimation and fast start-up equalization," IBM J. Res. Develop., vol. 27,
no. 5, pp. 426-431, Sep. 1983.
[1] R. V. Nee and R. Prasad, OFDM for Wireless Multimedia Communications.
London, England: Artech House, 2000.
[2] M. Morelli, C.-C. J. Kuo, and M. O. Pun, "Synchronization techniques
for orthogonal frequency division multiple access (OFDMA): A tutorial
review," Proc. IEEE, vol. 95, no. 7, pp. 1394-1427, July 2007.
[3] P. H. Moose, "A technique for orthogonal frequency division multiplexing
frequency offset correction," IEEE Trans. Commun., vol. 42, no. 10, pp.
2908-2914, Oct. 1994.
[4] T. M. Schmidl and D. C. Cox, "Robust frequency and timing synchronization
for OFDM," IEEE Trans. Commun., vol. 45, no. 12, pp. 1613-1621,
Dec. 1997.
[5] M. Morelli and U. Mengali, "An improved frequency offset estimator for
OFDM applications," IEEE Commun. Lett., vol. 3, no. 3, pp. 75-77, Mar.
1999.
[6] A. Laourine, A. St'ephenne, and S. Affes, "A new OFDM synchronization
symbol for carrier frequency offset estimation," IEEE Signal Process.
Lett., vol. 14, no. 5, pp. 321-324, May 2007.
[7] G. Ren, Y. Chang, H. Zhang, and H. Zhang, "An efficient frequency offset
estimation method with a large range for wireless OFDM systems," IEEE
Trans. Vehic. Technol., vol. 56, no. 4, pp. 1892-1895, July 2007.
[8] A. Milewski, "Periodic sequences with optimal properties for channel
estimation and fast start-up equalization," IBM J. Res. Develop., vol. 27,
no. 5, pp. 426-431, Sep. 1983.
@article{"International Journal of Electrical, Electronic and Communication Sciences:54060", author = "Taeung Yoon and Youngpo Lee and Chonghan Song and Na Young Ha and Seokho Yoon", title = "A Novel Estimation Method for Integer Frequency Offset in Wireless OFDM Systems", abstract = "Ren et al. presented an efficient carrier frequency offset
(CFO) estimation method for orthogonal frequency division multiplexing
(OFDM), which has an estimation range as large as the
bandwidth of the OFDM signal and achieves high accuracy without
any constraint on the structure of the training sequence. However,
its detection probability of the integer frequency offset (IFO) rapidly
varies according to the fractional frequency offset (FFO) change. In
this paper, we first analyze the Ren-s method and define two criteria
suitable for detection of IFO. Then, we propose a novel method for
the IFO estimation based on the maximum-likelihood (ML) principle
and the detection criteria defined in this paper. The simulation results
demonstrate that the proposed method outperforms the Ren-s method
in terms of the IFO detection probability irrespective of a value of
the FFO.", keywords = "Orthogonal frequency division multiplexing, integer frequency offset, estimation, training symbol", volume = "3", number = "11", pages = "1990-5", }