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| A Short-Time Fourier Transform Based Symbol Timing Atpproach for OFDM Systems |
| Kuang Yu-jun; Yue Guang-xin |
| Telecom. Eng. School Beijing Univ. of Posts and Telecomm.,Beijing 100876 China |
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Abstract 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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Received: 24 September 2002
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2004, Vol. 26 
