CFO estimation in OFDM systems under timing and channel length uncertainties with model averaging

Authors:
Kun Cai;Xiao Li;Jian Du;Yik-Chung Wu;Feifei Gao
Affiliations:
Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong;Department of Electrical and Computer Engineering, University of California, Davis;Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong;Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong;School of Engineering and Science, Jacobs University, Bremen, Germany
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

In this letter, we investigate the problem of CFO estimation in OFDM systems when the timing offset and channel length are not exactly known. Instead of explicitly estimating the timing offset and channel length, we employ a multimodel approach, where the timing offset and channel length can take multiple values with certain probabilities. The effect of multimodel is directly incorporated into the CFO estimator. Results show that the proposed estimator outperforms the estimator selecting only the most probable model and the method taking the maximal model.