A Novel Frequency Offset Estimation for OFDM Systems

Jong Yoon HWANG
Kwang Soon KIM
Keum-Chan WHANG

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B    No.11    pp.3132-3135
Publication Date: 2006/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.11.3132
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
blind synchronization,  frequency offset estimation,  orthogonal frequency division multiplexing (OFDM),  

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Summary: 
In this letter, a blind frequency offset estimation algorithm is proposed for OFDM systems. The proposed method exploits the intrinsic phase shift between neighboring samples in a single OFDM symbol, incurred by a frequency offset. The proposed algorithm minimizes a novel cost function, which is the squared error of the candidate frequency offset compensated signals from two different observation windows. Also, the solution of the proposed algorithm is given by an explicit equation, which does not require any iterative calculation. It is shown that the performance of the proposed method is better than those of the conventional methods, especially in the presence of multipath channels. This is due to the fact that the proposed method is insensitive to inter-symbol interference (ISI).