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Robust fine carrier offset estimation for OFDM in Doppler conditions  

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.46, no.5, 2009 , pp. 109-114 More about this Journal
Abstract
An orthogonal frequency division multiplexing(OFDM) system is effective to bandwidth because of orthogonality of subcarriers and robust to multipath fading. However, if there is a frequency offset, we lose the orthogonality of subcarriers and that results in inter-carrier interference(ICI) which increases errors in the system. In this paper, we propose an algorithm that estimates the fine frequency offset using a correlation method in OFDM systems. This scheme compares two correlation values in different frequency offsets with opposite directions. From the difference between two correlation values we can derive a fine frequency offset estimation algorithm. Its performance is verified by computer simulations.
Keywords
Synchronization; Frequency Offset Estimation; OFDM;
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