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

Yi Guo, Gang Liu, I. Tai Lu, Jianhua Ge, Haiyang Ding

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publication2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014
PublisherIEEE Computer Society
ISBN (Print)9781479938506
DOIs
StatePublished - Jan 1 2014
Event2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014 - Farmingdale, NY, United States
Duration: May 2 2014May 2 2014

Publication series

Name2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014

Other

Other2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014
CountryUnited States
CityFarmingdale, NY
Period5/2/145/2/14

Keywords

  • Cooperative systems
  • Frequency synchronization
  • OFDM
  • Preamble
  • Time synchronization

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications

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  • Cite this

    Guo, Y., Liu, G., Lu, I. T., Ge, J., & Ding, H. (2014). A new time and frequency synchronization scheme for OFDM-based cooperative systems. In 2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014 [06845205] (2014 IEEE Long Island Systems, Applications and Technology Conference, LISAT 2014). IEEE Computer Society. https://doi.org/10.1109/LISAT.2014.6845205