{"title":"A Novel Frequency Offset Estimation Scheme for OFDM Systems","authors":"Youngpo Lee, Seokho Yoon","volume":79,"journal":"International Journal of Electronics and Communication Engineering","pagesStart":948,"pagesEnd":953,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/16578","abstract":"In this paper, we propose a novel frequency offset \r\nestimation scheme for orthogonal frequency division multiplexing \r\n(OFDM) systems. By correlating the OFDM signals within the coherence \r\nphase bandwidth and employing a threshold in the frequency \r\noffset estimation process, the proposed scheme is not only robust to \r\nthe timing offset but also has a reduced complexity compared with \r\nthat of the conventional scheme. Moreover, a timing offset estimation \r\nscheme is also proposed as the next stage of the proposed frequency \r\noffset estimation. Numerical results show that the proposed scheme \r\ncan estimate frequency offset with lower computational complexity \r\nand does not require additional memory while maintaining the same \r\nlevel of estimation performance.<\/p>\r\n","references":"[1] K. Fazel and S. Kaiser, Multi-carrier and spread spectrum systems, West\r\nSussex, England: John Wiley and Sons, 2003.\r\n[2] R. V. Nee and R. Prasad, OFDM for Wireless Multimedia Communications,\r\nLondon, England: Artech House, 2000.\r\n[3] F. Gini and G. B. Giannakis, “Frequency offset and symbol timing\r\nrecovery in flat-fading channels: a cyclostationary approach,” IEEE Trans.\r\nComm., vol. 46, pp. 400-411, Mar. 1998.\r\n[4] T. M. Schmidl and D. C. Cox, “Robust frequency and timing synchronization\r\nfor OFDM,” IEEE Trans. Comm., vol. 45, pp. 1613-1621, Dec.\r\n1997.\r\n[5] Y. H. Kim, I. Song, S. Yoon, and S. R. Park, “An efficient frequency\r\noffset estimator for OFDM systems and its performance characteristics,”\r\nIEEE Trans. Veh. Tech., vol. 50, pp. 1307-1312, Sep. 2001.\r\n[6] J. J. van de Beek, M. Sandell, and P. O. Borjesson, “ML estimation of time\r\nand frequency offset in OFDM systems,” IEEE Trans. Signal Process.,\r\nvol. 45, pp. 1800-1805, July 1997.\r\n[7] M. Morelli and U. Mengali, “An improved frequency offset estimator for\r\nOFDM applications,” IEEE Comm. Lett., vol. 3, pp. 75-77, Mar. 1999.\r\n[8] H. Nogami and T. Nagashima, “A frequency and timing period acquisition\r\ntechnique for OFDM systems,” in Proc. IEEE PIRMC, Toronto, Canada,\r\npp. 1010-1015, Sep. 1995.\r\n[9] K. Bang, N. Cho, H. Jun, K. Kim, H. Park, and D. Hong, “A coarse\r\nfrequency offset estimation in an OFDM systems using the concept of\r\nthe coherence phase bandwidth,” IEEE Trans. Comm., vol. 49, pp. 1320-\r\n1324, Aug. 2001.<\/p>\r\n","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 79, 2013"}

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