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Volume 26 Issue 3
Mar.  2004
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Kuang Yu-jun, Yue Guang-xin. A Short-Time Fourier Transform Based Symbol Timing Atpproach for OFDM Systems[J]. Journal of Electronics & Information Technology, 2004, 26(3): 453-458.
Citation: Kuang Yu-jun, Yue Guang-xin. A Short-Time Fourier Transform Based Symbol Timing Atpproach for OFDM Systems[J]. Journal of Electronics & Information Technology, 2004, 26(3): 453-458.

A Short-Time Fourier Transform Based Symbol Timing Atpproach for OFDM Systems

  • Received Date: 2002-09-24
  • Rev Recd Date: 2003-03-10
  • Publish Date: 2004-03-19
  • A blind short-time Fourier transform based approach for symbol timing in OFDM systems is proposed. The key of the described algorithm leans upon the periodic 2-D time-frequency spectrum structure. By searching the flat regions in the time direction of time-frequency spectrum of the received signal, ISI-free intervals are estimated, where optimum symbol start can be easily located. Simulation results show that the proposed algorithm is quite robust against low SNR environment, and outperforms time-domain cor relation based algorithms.
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  • Wei L, Schlegel C. Synchronization requirements for multiuser OFDM on satellite mobile and two path Rayleigh fading channels. IEEE Trans. on Communications, 1995, COM-43(2/3/4):887-895.[2]Pollet T, Moeneclaey M. Synchronizability of OFDM signals[J].In Proc. of GLOBECOM95,Singapore.1995, 3(9):2054-2058[3]Moose P H. A technique for orthogonal frequency division multiplexing frequency offset correction.IEEE Trans. on Communications, 1994, COM-42(10): 2908-2914.[4]Van De Beek J J, Sandel M, Borjesson P O. ML estimation of time and frequency offset in OFDM systems. IEEE Trans. on Signal Processing, 1997, SP-45(7): 1800-1805.[5]Johansson S, Landstrom D, Nilsson P. Silicon realization of an OFDM synchronization algorithm[J].Electronics, Circuits and Systems, Proc. of ICECS99, Pafos, Cyprus.1999, vol.1:319-322[6]Kuang Yujun, Yue Guangxin. On performance of time synchronization schemes for OFDM systems. Proc. of the International Conference of Telecommunications, Beijing, 2002, Vol.2: 720-724.[7]va Nee R, Prasad R. OFDM Wireless Multimedia Communications, New York: Artech House,1999: 73-79.[8]Dusan Matic, Ton A J, Coenen R M. OFDM timing synchronization: possibilities and limits to the usage of the cyclic prefix for maximum likelihood estimation. VTC99, Amsterdam, Netherlands,1999: 668-672.[9]Jun Wu, Qun Zhou, Cheng K K M. The adaptive algorithm of symbol timing and carrier phase estimation in OFDM systems. ICC 2001, IEEE International Conference on Comm., Helsinki,Finland, 2001, Vol.1: 156-160.[10]Ramasubramanian K, Baum K. An OFDM timing recovery scheme with inherent delay-spread estimation[J].Global Telecommunications Conference, San Antonio, TX, USA, GLOBECOM01,IEEE.2001, Vol.5:3111-3115
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