CFO estimation schemes for differential OFDM systems

Authors:
Xiang Nian Zeng;Ali Ghrayeb
Affiliations:
Department of Electrical and Computer Engineering, McGill University and Department of Electrical and Computer Engineering, Concordia University, Montreal, Quebec, Canada;Department of Electrical and Computer Engineering, Concordia University, Montreal, Quebec, Canada
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 2
Cited 0

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Abstract

This paper proposes two blind carrier frequency offset (CFO) estimation schemes for differentially modulated orthogonal frequency division multiplexing (OFDM) systems. The proposed schemes estimate the fractional part of the CFO with only two consecutive OFDM blocks, and they exploit two implicit properties associated with differentially modulated OFDM (DOFDM) systems, i.e., the channel keeps constant over two consecutive OFDM blocks, and the DOFDM systems employ an M-ary phase-shift keying constellation. One of the schemes is based on the finite alphabet (FA) constraint and the other one is based on the constant modulus (CM) constraint. They provide a trade-off between the performance and computational complexity. The constrained Cramer-Rao lower bound is also derived. Several numerical examples are presented to validate the efficacy of the proposed schemes.