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Timing Synchronization and Frequency Offset Estimation for OFDMA/TDD Mode in Downlink of IEEE 802.16-2004

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Timing and frequency synchronization are the important task in receiver. This paper proposes a timing synchronization and carrier frequency offset (CFO) estimation algorithm for orthogonal frequency division multiple access (OFDMA) downlink in IEEE 802.16e standard. This method has high performance and estimates CFO. The proposed scheme utilizes the conjugate symmetry property of preamble structure. Simulations are conducted for AWGN and multipath channels to demonstrate the performance of the proposed timing metric. Our proposed method can achieve reasonable performance at low SNR.
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Bibliografia
  • [1] “Part 16: Air Interface for Fixed Broadband Wireless Access Systems, IEEE Standard 802.16.2004.”
  • [2] “Part 16: Air interface for fixed and mobile Broadband wireless access systems, IEEE standard. 802.16.e-2005.”
  • [3] K. Pushpa, C. N. Kishore, and Y. Yoganandam, “Comparative study of four modified timing metrics for the Frame Synchronization in OFDMA mode of WMAN,” in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, September 2008, pp. 1-5.
  • [4] L. Hanzo, M. Mnster, B. J. Choi, and T. Keller, OFDM and MC-CDMA for broadband multi user communications, WLANs and broadcasting. IEEE Press, 2003.
  • [5] A. Azari, S. Nader Esfahani, and M. Naderi, “New timing metric for the frame synchronization in WiMAX OFDMA applications,” in 23rd International Congress on Anti Cancer Treatment, 2010.
  • [6] J. J. Vande Beek, M. Sandell, and P. O. Borjesson, “ML estimation of time and frequency offset in OFDM systems,” IEEE Trans. Signal Processing, vol. 45, pp. 1800-1805, July 1997.
  • [7] T. M. Schmidl and D. C. Cox, “Robust frequency and timing synchronization for OFDM,” IEEE Transactions on Communications, vol. COM-45, pp. 1613-1621, December 1997.
  • [8] Y. H. Kim and Y. K. Halun, “An efficient frequency offset estimator for timing and frequency synchronization in OFDM systems,” IEEE Transactions on Vehicular Technology, vol. 50, no. 5, pp. 580-583, 2001.
  • [9] M. Wu and W. P. Zhu, “A preamble-aided symbol and frequency synchronization scheme for OFDM systems,” in IEEE International Symposium on Circuts and Systems, May 2005, pp. 2627-2630.
  • [10] T. Bhatt, V. Sundaramurthy, J. Zhang, and D. McCain, “Initial synchronization for 802.l6e downlink,” in Asilomar Conference on Signals, Systems and Computers, 2006, pp. 701-706.
  • [11] A. Salbiyono and T. Adiono, “Preamble structure-based timing synchronization for IEEE 802.l6.e,” in IEEE International Symposium on Intelligent Signal Processing and Communication Systems, 2009, pp. 319-322.
  • [12] Z. Huang, B. Li, and M. Liu, “A proposed timing synchronization method for 802.16.e downlink,” in IEEE International Symposium on Intelligent Signal Processing and Communication Systems, December 6-8 2010.
  • [13] C. Y. Yang, G. R. Lee, W. H. Kuan, and J. H. Wen, “Blind synchronization scheme using the conjugate characters of the OFDM-BPSK modulated symbol,” in Blind synchronization scheme using the conjugate characters of the OFDM -BPSK modulated symbol. Elsevier Inc., 2011.
  • [14] C. Y. Yang, G. R. Lee, W. H. Kuan, and J. H. Wen, “Symbol synchronization at the BPSK-OFDM receiver,” in Proceedings of IEEE Mobile WiMax, Symposium, 2007, pp. 12-16.
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bwmeta1.element.baztech-article-BWA0-0053-0027
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