DocumentCode :
1499294
Title :
Integer Frequency Offset Estimation for OFDM Systems With Residual Timing Offset Over Frequency Selective Fading Channels
Author :
Li, Danping ; Li, Yongzhao ; Zhang, Hailin ; Cimini, Leonard J., Jr. ; Fang, Yuguang
Author_Institution :
State Key Lab. of Integrated Services Networks, Xidian Univ., Xi´´an, China
Volume :
61
Issue :
6
fYear :
2012
fDate :
7/1/2012 12:00:00 AM
Firstpage :
2848
Lastpage :
2853
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.
Keywords :
OFDM modulation; fading channels; time-domain analysis; CAF expression; OFDM system; ambiguity function surface; cross ambiguity function; estimation performance; frequency selective fading channel; frequency-selective fading channel; full acquisition range estimation; integer frequency offset estimation; orthogonal frequency-division multiplexing system; residual timing offset; spectrum overhead; time-domain signal; training sequence; Doppler effect; Estimation; Frequency domain analysis; Frequency estimation; OFDM; Timing; Training; Cross ambiguity function (CAF); frequency-selective fading; integer frequency offset (IFO); residual timing offset (RTO);
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2012.2195234
Filename :
6186841
Link To Document :
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