NDLI: A new time and frequency synchronization scheme for OFDM-based cooperative systems

Content Provider	IEEE Xplore Digital Library
Author	Yi Guo Gang Liu I-Tai Lu Jianhua Ge Haiyang Ding
Copyright Year	2014
Description	Author affiliation: ISN Nat. Key Lab., Xidian Univ., Xi'an, China (Yi Guo; Gang Liu; Jianhua Ge; Haiyang Ding) \|\| Dept. of Electr. & Comput. Eng., New York Univ. Polytech., New York, NY, USA (I-Tai Lu)
Abstract	In an OFDM-based cooperative relay system, the arrival times and carrier frequency offsets (CFOs) of the signals from different relays are most likely different. Estimation of these timing offsets and CFOs is a crucial and challenging task. In this paper, a new preamble structure is designed, and an efficient time and frequency offset estimator is proposed for the OFDM-based cooperative system. The signals from different relays are separated using the low cross-correlated pseudo noise (PN) sequences. The coarse timing synchronization is accomplished using the time-domain symmetric conjugate of the preamble, and the fine timing synchronization is accomplished by segmented moving correlation using the good autocorrelation feature of the preamble in the time domain. The fractional frequency offset is estimated using the phase difference of the two duplicated training symbols, and the integral frequency offset is estimated by utilizing the low energy at null subcarriers and the good autocorrelation features of the preamble in the frequency domain. The analysis and the simulation results show that adopting the proposed preamble structure and synchronization algorithms, the destination can estimate not only the timing offsets from all relays but also the frequency offsets from all relays.
Sponsorship	IEEE Long Island Sect.
Starting Page	1
Ending Page	5
File Size	241756
Page Count	5
File Format	PDF
ISBN	9781479938506
DOI	10.1109/LISAT.2014.6845205
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-05-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays OFDM Estimation Frequency estimation Synchronization Time-frequency analysis Frequency synchronization Cooperative systems Preamble Time synchronization
Content Type	Text
Resource Type	Article

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