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Author Danping Li ♦ Yongzhao Li ♦ Hailin Zhang ♦ Cimini, L.J. ♦ Yuguang Fang
Sponsorship IEEE Vehicular Technology Society
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1967
Language English
Subject Domain (in DDC) Social sciences ♦ Commerce, communications & transportation ♦ Technology ♦ Engineering & allied operations ♦ Other branches of engineering
Subject Keyword Estimation ♦ Training ♦ OFDM ♦ Doppler effect ♦ Frequency estimation ♦ Frequency domain analysis ♦ Timing ♦ residual timing offset (RTO) ♦ Cross ambiguity function (CAF) ♦ frequency-selective fading ♦ integer frequency offset (IFO)
Abstract Accurate integer frequency offset (IFO) estimation is crucial for orthogonal frequency-division multiplexing (OFDM) systems, particularly in the presence of frequency-selective fading and residual timing offset (RTO). For existing algorithms, however, it is still a challenge to obtain a good tradeoff among the estimation performance, complexity, and spectrum overhead. In this paper, we propose a novel cross ambiguity function (CAF)-based IFO estimator using only one training sequence. By designing the training sequence, which has only a single sharp peak on its ambiguity function surface, a highly accurate and full acquisition range estimation of the IFO can be obtained in the presence of frequency-selective fading and RTO. Moreover, the adoption of the CAF expression in terms of time-domain signals ensures that the complexity of the proposed algorithm is relatively low. Simulation results verify its superior accuracy in frequency-selective fading channels and in the presence of RTO.
Description Author affiliation :: Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL, USA
Author affiliation :: State Key Lab. of Integrated Services Networks, Xidian Univ., Xi'an, China
Author affiliation :: Dept. of Electr. & Comput. Eng., Univ. of Delaware, Newark, DE, USA
ISSN 00189545
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2012-07-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 61
Issue Number 6
Size (in Bytes) 294.17 kB
Page Count 6
Starting Page 2848
Ending Page 2853


Source: IEEE Xplore Digital Library