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Frequency Offset Estimation for OFDM Systems in the Presence of I/Q Mismatch

Chen, Ying, Jayalath, Dhammika, Zhang, Jian, & Pollock, Tony (2007) Frequency Offset Estimation for OFDM Systems in the Presence of I/Q Mismatch. In IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007 (PIMRC 2007)., 3-7 Sept. 2007, Athens.

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Abstract

It is well known that Orthogonal Frequency Division Multiplexing (OFDM) systems are sensitive to carrier frequency offset (CFO), hence frequency offset estimation and compensation is critical in OFDM systems. The performance of general CFO estimation methods will degrade in the presence of hardware distortions, for example, I/Q mismatch. With higher carrier frequencies, both CFO and I/Q mismatch will increase and the performance of CFO estimation will degrade significantly. CFO estimation robust to I/Q mismatch becomes particularly important today because of the demand of broadband wireless communication at higher carrier frequencies. In this paper, we propose a low complexity CFO estimation algorithm which is robust to a large range of I/Q mismatch. The proposed estimator can achieve similar performance with the general CFO estimation method when smaller I/Q mismatch is present while improve the system performance significantly when a larger mismatch is present.

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ID Code: 13745
Item Type: Conference Paper
DOI: 10.1109/PIMRC.2007.4394289
ISBN: 9781424411443
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > COMMUNICATIONS TECHNOLOGIES (100500) > Communications Technologies not elsewhere classified (100599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2007 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 12 Jun 2008
Last Modified: 11 Aug 2011 04:36

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