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Timing Synchronization with Channel Impulse Response in OFDM Systems  

Kang, Eun-Su (School of Electrical Engineering and Computer Science, Kyungpook National University)
Han, Dong-Seog (School of Electrical Engineering and Computer Science, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.7, 2007 , pp. 53-58 More about this Journal
Abstract
OFDM (orthogonal frequency division multiplexing) is an effective modulation technique for high speed transmission over fading channels. However, it has a high bit error rate in the receiver if there is an error on frame synchronization because of phase rotation. A coherent OFDM system has to acquire exact timing synchronization of fraction and integer sampling positions. When a sampling offset exist the performance of a receiver will be degraded severely. In this paper, we propose an algorithm that acquires the fractional sampling offset in OFDM systems. This scheme compares the channel impulse responses with the early and late sampled signals having 0.5 sample offset from the estimated sampling positions by correlation with the received and training samples. Its performance is verified by computer simulations in multipath channels.
Keywords
OFDM; symbol timing synchronization; timing recovery;
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