An Improved Frequency Offset Estimation Based on Companion Matrix in Multi-User Uplink Interleaved OFDMA Systems

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In this letter, we consider a multiuser uplink orthogonal frequency-division multiple access (OFDMA) system. To estimate the carrier frequency offset (CFO) efficiently, a modified pilot structure has been proposed to allow sufficient frequency separation between the subcarriers allocated to any two users. The proposed structure can reduce the ambiguity problem caused by the multiple signal classification (MUSIC) based algorithm when a CFO of one user is close to that of a different user. We present a CFO estimation method based on the companion matrix obtained using the received signal from the proposed pilot structure. Simulation results show that the proposed CFO estimator performs better than the conventional estimator and maintains its performance as the CFO range increases.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2014-04
Language
English
Article Type
Article
Keywords

MAXIMUM-LIKELIHOOD; CHANNEL ESTIMATION; SYNCHRONIZATION; TRANSMISSIONS; MUSIC; ML

Citation

IEEE SIGNAL PROCESSING LETTERS, v.21, no.4, pp.409 - 413

ISSN
1070-9908
DOI
10.1109/LSP.2014.2303138
URI
http://hdl.handle.net/10203/190153
Appears in Collection
EE-Journal Papers(저널논문)
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