{"title":"A Novel FFT-Based Frequency Offset Estimator for OFDM Systems","authors":"Mahdi Masoumi, Mehrdad Ardebilipoor, Seyed Aidin Bassam","volume":12,"journal":"International Journal of Electrical and Computer Engineering","pagesStart":1953,"pagesEnd":1957,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/940","abstract":"<p>This paper proposes a novel frequency offset (FO) estimator for orthogonal frequency division multiplexing. Simplicity is most significant feature of this algorithm and can be repeated to achieve acceptable accuracy. Also fractional and integer part of FO is estimated jointly with use of the same algorithm. To do so, instead of using conventional algorithms that usually use correlation function, we use DFT of received signal. Therefore, complexity will be reduced and we can do synchronization procedure by the same hardware that is used to demodulate OFDM symbol. Finally, computer simulation shows that the accuracy of this method is better than other conventional methods.<\/p>\r\n","references":"[1] J. A. C. Bingham, \"Multicarrier modulation for data transmission: An\r\nidea whose time has come,\" IEEE Commun. Mag., vol. 28, no. 5, pp. 5-\r\n14, May 1990.\r\n[2] P. Moose, \"A technique for orthogonal frequency division multiplexing\r\nfrequency offset correction,\" IEEE Trans. Commun., vol. 42, no. 10,pp.\r\n2908-2914, Oct. 1994.\r\n[3] R. van Nee and R. Prasad, OFDM for Multimedia Communications,\r\nBoston: Artech-House, 2000.\r\n[4] K.W. Yip et al., \"Design of multiplierless correlators for Timing\r\nsynchronization in IEEE 802.11a Wireless LANs\", IEEE Transactions\r\non Consumer Electronics, vol.49, No.1, pp.107\u00d4\u00c7\u00f6114, Feb. 2003.\r\n[5] B.Y. Prasetyo, F. Said and A.H. Aghvami, \"Fast burst synchronization\r\ntechnique for OFDM-WLAN systems\", IEE Proc. Commun., vol.147,\r\nNo. 5, pp.292\u00d4\u00c7\u00f6297, Oct. 2000.\r\n[6] M. Sandell, J.V. Beek, and P.O. Borjession, \"Timing and frequency\r\nsynchronization in OFDM systems using the cyclic prefix,\" Proc.\r\nInternational Symposium on Synchronization, Essen, Germany,\r\nDecember 14-15, 1995, pp.16-19.\r\n[7] T.M. Schmidl and D.C. Cox, \"Robust frequency and timing\r\nsynchronization for OFDM,\" IEEE Trans. Commun., vol.45, pp.1613-\r\n1621, Dec, 1997.\r\n[8] H. Minn, M. Zeng, and V.K. Bhargava, \"On timing offset estimation for\r\nOFDM system,\" IEEE Comm. Lett., vol.4, pp.242-244, July 2000.\r\n[9] J. Lee, H. Lou, D. Toumpakaris, and J. M. Cioffi, \"A blind frequency\r\ntracking algorithm for OFDM transmission over frequency selective\r\nchannels,\" in Proc. IEEE Veh. Technol. Conf. 2004-Fall, 2004.\r\n[10] M. Morelli, A. N. D-Andrea, and U. Mengali, \"Frequency ambiguity\r\nresolution in OFDM systems,\" IEEE Commun. Lett., vol. 4, pp. 134-\r\n136, Apr. 2000.\r\n[11] T. Pollet, P. Spruyt, and M. Moeneclaey, \"The BER performance of\r\nOFDM systems using nonsynchronized sampling,\" in Proc. Global\r\nTelecommunications Conf., San Francisco, CA, Nov. 1994, pp. 253-\r\n257.\r\n[12] Alan V. Oppenheim and Ronald W. Schafer, Discrete-Time Signal\r\nProcessing, Prentice Hall, 1999.\r\n[13] J. V. D. Beek, M. Sandell, and P. 0. Borjesson, \"ML estimation of time\r\nand frequency offset in OFDM systems\", IEEE Transactions on Signal\r\nProcessing, Vol. 45, No. 7, July 1997, pp. 1800-1805.\r\n[14] M. Makundi, A. Hjorungnes, T. I. Loakso, \"An Interpolation-Based\r\nFrequency-Synchronization Scheme for OFDM Systems,\" IEEE 6th\r\nWorkshop on Signal Processing Advances in Wireless\r\nCommunications, 2005.\r\n[15] IEEE 802.11a, Part 11: wireless LAN Medium Access Control (MAC)\r\nand Physical Layer (PHY) specifications: High-speed physical layer in\r\nthe 5 GHz band, Supplement to IEEE standard for information\r\ntechnology telecommunications and information exchange between\r\nsystems - local and metropolitan area networks - specific requirements,\r\n1999.\r\n[16] J. Medbo and P. Schramm, \"Channel models for HiperLAN\/2 in\r\ndifferent indoor scenarios,\" ETSI BRAN, Technical Report 3ERI085B,\r\n1998.\r\n[17] K. Shi, and E. Serpedin, \"A Robust Metric for Coarse Frame and\r\nCarrier Synchronization of OFDM Systems\", in Proc. of The 36th\r\nAsilomar Conference on Signals, System and Computers, Vol. 2, 3-6\r\nNov. 2002, pp. 1827-1831.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 12, 2007"}