Abstract
Orthogonal frequency division multiplexing (OFDM) is a promising technique for wireless system due to its high spectral efficiency and its capability to counteract frequency selective fading channels. However, OFDM system is highly vulnerable to timing offset. This study proposes a novel timing estimation algorithm for downlink OFDM systems. A novel training sequence structure using Chu sequence is proposed. A new property of the inverse discrete Fourier transform of Chu sequence is derived. This property is used to obtain channel impulse response to estimate start of the OFDM symbol. The mean square error and timing detection performance of the proposed algorithm are shown to be better than the existing methods.
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