Blind CFO Estimation Based on Decision Directed MVDR Approach for Interleaved OFDMA Uplink Systems

Chih-Chang SHEN  Ann-Chen CHANG  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.1   pp.137-145
Publication Date: 2014/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.137
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
CFO,  interleaved OFDMA,  MVDR,  Taylor series expansion,  iterative approach,  decision directed,  

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This paper deals with carrier frequency offset (CFO) estimation based on the minimum variance distortionless response (MVDR) criterion without using specific training sequences for interleaved orthogonal frequency division multiple access (OFDMA) uplink systems. In the presence of large CFOs, the estimator is proposed to find a new CFO vector based on the first-order Taylor series expansion of the one initially given. The problem of finding the new CFO vector is formulated as the closed form of a generalized eigenvalue problem, which allows one to readily solve it. Since raising the accuracy of residual CFO estimation can provide more accurate residual CFO compensation, this paper also present a decision-directed MVDR approach to improve the CFO estimation performance. However, the proposed estimator can estimate CFOs with less computation load. Several computer simulation results are provided for illustrating the effectiveness of the proposed blind estimate approach.