Blind Residual CFO Estimation under Single Data Block for Uplink Interleaved OFDMA

Ann-Chen CHANG  Chih-Chang SHEN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E98-A   No.1   pp.411-414
Publication Date: 2015/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E98.A.411
Type of Manuscript: LETTER
Category: Digital Signal Processing
CFO,  interleaved OFDMA,  orthogonal projection,  Taylor series expansion,  decision-directed,  

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In this letter, an iterative carrier frequency offset (CFO) estimation approach is presented which finds a new CFO vector based on first order Taylor series expansion of the one initially given for interleaved orthogonal frequency division multiple access uplink systems. 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. The proposed estimator combined center-symmetric trimmed correlation matrix and orthogonal projection technique, which doesn't require eigenvalue decomposition and it only needs single data block.