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A high performance frequency offset estimator for OFDM. (English) Zbl 1141.94336
Summary: 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.
##### MSC:
 94A40 Channel models (including quantum) in information and communication theory
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##### References:
 [1] Kim, Y.; Jeong, B. J.; Chung, J.; Hwang, C. S.; Ryu, J. S.; Kim, K. H.; Kim, Y. K., Beyond 3G: vision, requirements, and enabling technologies, IEEE Commun. Magazine, 41, 120-124, (2003) [2] Kuo, C.; Chang, J. F., Generalized frequency offset estimation in OFDM systems using periodic training symbol, IEEE ICC’05, 1, 715-719, (2005) [3] Morelli, M.; Mengali, U., An improved frequency offset estimator for OFDM applications, IEEE Commun. Lett., 3, 75-77, (1999) [4] Rugini, L.; Banelli, P., BER of OFDM systems impaired by carrier frequency offset in multipath fading channels, IEEE Trans. on Wireless Communications, 4, 2279-2288, (2005) [5] Schmidl, T. M.; Cox, D. C., Robust frequency and timing synchronization for OFDM, IEEE Trans. on Communications, 45, 1613-1621, (1997) [6] Seo, B. S.; Kim, S. C.; Park, J., Fast coarse frequency offset estimation for OFDM systems by using differentially modulated subcarriers, IEEE Trans. Consum. Electron., 48, 1075-1081, (2002) [7] 3GPP TSG-RAN-1.TR 25.892, 2004. Feasibility Study for OFDM for UTRAN Enhancement (Release 6) [EB/OL]. Http://www.3gpp.org/ftp/Specs/archive/25series/25.892/25892-600.zip. [8] Tureli, U. P.; Honan, J.; Liu, H., Low-complexity nonlinear least squares carrier offset estimator for OFDM identifiability, diversity and performance, IEEE Trans. on Signal Processing, 52, 2441-2452, (2004) [9] Wu, M.; Zhu, W. P., A preamble-aided symbol and frequency synchronization scheme for OFDM systems, IEEE ISCAS’05, 3, 2627-2630, (2005) [10] Zhao, Z. W., Performance of a novel carrier frequency offset estimation algorithm for OFDM-based WLANs, J. Zhejiang University SCIENCE A, 7, 321-325, (2006) · Zbl 1101.94017
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