An efficient two-step approach to integer frequency offset detection for OFDM systems

Authors:
Jeongchang Kim;Kyungwhoon Cheun
Affiliations:
Department of Electronics and Communications Engineering, Korea Maritime University, Busan, Republic of Korea;Division of Information Technology Convergence Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea
Venue:
Signal Processing
Year:
2012

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Abstract

An efficient preamble structure for OFDM systems is proposed which inserts a short embedded repetition pattern (SERP) into conventional preamble structures allowing a two-step detection of the integer frequency offset (IFO). A coarse estimate of the IFO using the SERP is performed in the time domain prior to performing fine IFO detection in the frequency domain based on the original preamble structure. The complexity of the overall IFO detection procedure can be significantly reduced at a price of slight loss in SNR.