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OFDM receiver performance is affected by the time offset and the carrier frequency offset, as these two parameters have sever effect on the signal reception quality. In this paper, two novel schemes for time estimation (TE) and frequency estimation (FE) are proposed to overcome the time and carrier frequency offset problem, and therefore improve the performance of the OFDM reception. The proposed techniques are based on the fact that, using the correlation of constant amplitude zero auto correlation sequence with a unity peak to average power ratio gives a sharp time metric peak. The proposed timing symbol based on this fact introduces a TE technique that has a sharp peak at the correct time instant and no side lobes. In addition, the proposed FE technique is based on the same training symbol and it takes place in two steps. The first step is the fine FE technique, which depends on calculating the phase difference between the cyclic prefix and the preamble tail. It is referred to as fractional FE. The second step is the coarse offset FE and it is referred to as integer FE. The coarse offset FE is based on FFT and it has less mean square error than other methods.
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Schulze, H., & Lueders, C. (2005). Theory and applications of OFDM and CDMA: Wideband wireless communications. New York: Wiley.
Ratasuk, R., Tolli, D., & Ghosh, A. (2010). Carrier aggregation in LTE-advanced. In Proceedings of IEEE 71st vehicular technology conference VTC-2010 (pp. 1–5). Taipei.
Dahlman, E., Parkvall, S., & Sköld, J. (2011). 4G LTE/LTE-advanced for mobile broadband. Amsterdam: Elsevier Ltd.
Schmidl, T., & Cox, D. (1997). Robust frequency and timing synchronization for OFDM. IEEE Transactions on Communications, 45(12), 1613–1621. CrossRef
Minn, H., Zeng, M., & Bhargava, V. K. (2000). On timing offset estimation for OFDM systems. IEEE Communication Letters, 4(7), 242–244. CrossRef
Park, B., Cheon, H., & Kang, C. (2003). A novel timing estimation method for OFDM systems. IEEE Communications Letters, 7(5), 239–241. CrossRef
Choi, S. D., Choi, J., M., & Lee, J. H. (2006). An initial timing offset estimation method for OFDM systems in Rayleigh fading channel. Proceedings of IEEE 64th vehicular technology conference VTC-2006.
Wang, H., et al. (2012). A novel synchronization algorithm for OFDM systems with weighted CAZAC sequence. Journal of Computational Information Systems, 8(6), 2275–2283.
Boshehba, S. A., Badran E. F., & Mahmoud, M. (2013). A modified blind deterministic carrier frequency offset estimator for OFDM systems. Proceedings of the 2013 Japan–Egypt conference on electronics, communications and computers (JEC-ECC’2013) (pp. 18–22). Cairo, Egypt, 17–19.
Badran, E. F., Samara M., & Aly, M. H. (2013). A novel frame synchronization scheme via wavelet packet transform for OFDM systems. Proceedings of the 2013 Japan–Egypt conference on electronics, communications and computers (JEC-ECC’2013) (pp. 12–17). Cairo, Egypt, 17–19.
- Novel Time and Frequency Synchronization Techniques for OFDM Systems in Double Selective Fading Channel
Ehab F. Badran
Amira I. Zaki
- Springer US