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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Robust CFO Acquisition in PN-Padded OFDM Systems

  • Liu, Guanghui (School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC)) ;
  • Zeng, Liaoyuan (School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC)) ;
  • Li, Hongliang (School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC)) ;
  • Xu, Linfeng (School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC)) ;
  • Wang, Zhengning (School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC))
  • Received : 2012.09.29
  • Accepted : 2013.05.06
  • Published : 2013.08.01
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Abstract

As an alternative to the traditional pilot-aided orthogonal frequency division multiplexing (OFDM), the time-domain pseudonoise (PN)-padded OFDM provides a higher spectral efficiency. However, the carrier frequency offset (CFO) attenuates peaks of the conventional PN correlation output, which limits the CFO estimation range of the OFDM synchronizer. An improved correlation is proposed in this letter to remove the CFO-induced amplitude attenuation of correlation peaks. For a synchronizer adopting the designed correlator, a larger range of CFO acquisition is obtained through using wider correlation windows with a smaller interval between them. The proposed method of CFO acquisition is verified in a digital terrestrial multimedia broadcast receiver, in which the synchronizer is able to acquire CFOs up to ${\pm}320$ kHz in the DVB-T F1 channel. Furthermore, the acquisition range can be expanded in more favorable channels.

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References

  1. J. Song et al., "Technical Review on Chinese Digital Terrestrial Television Broadcasting Standard and Measurements on Some Working Modes," IEEE Trans. Broadcast., vol. 53, no. 1, Mar. 2007, pp. 1-7. https://doi.org/10.1109/TBC.2007.891835
  2. W. Zhang et al., "An Introduction of the Chinese DTTB Standard and Analysis of the PN595 Working Modes," IEEE Trans. Broadcast., vol. 53, no. 1, Mar. 2007, pp. 8-13. https://doi.org/10.1109/TBC.2007.891708
  3. G. Liu et al., "Low-Complexity Iterative Equalization for Symbol-Reconstruction Based OFDM Receivers over Doubly Selective Channels," IEEE Trans. Broadcast., vol. 58, no. 3, Sept. 2012, pp. 390-400. https://doi.org/10.1109/TBC.2012.2200793
  4. Framing Structure, Channel Coding and Modulation for Digital Television Broadcasting System, Chinese Standard of Digital Terrestrial Television Broadcasting (DTTB), GB20600-2006, Aug. 2006.
  5. G. Liu and S.V. Zhidkov, "A Composite PN-Correlation Based Synchronizer for TDS-OFDM Receiver," IEEE Trans. Broadcast., vol. 56, no. 1, Mar. 2010, pp. 77-85. https://doi.org/10.1109/TBC.2009.2039520
  6. J. Wang et al., "A Combined Code Acquisition and Symbol Timing Recovery Method for TDS-OFDM," IEEE Trans. Broadcast., vol. 49, no. 3, Sept. 2003, pp. 304-308. https://doi.org/10.1109/TBC.2003.817092
  7. Z.W. Zheng, "Robust Timing Recovery for TDS-OFDM-Based Digital Television Terrestrial Broadcast Systems," IEEE Trans. Consum. Electron., vol. 52, no. 3, Aug. 2006, pp. 750-756. https://doi.org/10.1109/TCE.2006.1706466
  8. G. Liu, "Comments on 'A Combined Code Acquisition and Symbol Timing Recovery Method for TDS-OFDM,'" IEEE Trans. Broadcast., vol. 52, no. 4, Dec. 2006, p. 585. https://doi.org/10.1109/TBC.2006.883298
  9. L. Gui, B. Liu, and B. Song, "A Novel Method of Frequency-Offset Estimation Using Time Domain PN Sequences in OFDM Systems," IEEE Trans. Broadcast., vol. 54, no. 1, Mar. 2008, pp. 140-145. https://doi.org/10.1109/TBC.2007.910924
  10. S. Tang et al., "Robust Frame Synchronization for Chinese DTTB System," IEEE Trans. Broadcast., vol. 54, no. 1, Mar. 2008, pp. 152-158. https://doi.org/10.1109/TBC.2007.912056
  11. L. Gui et al., "Low Complexity Channel Estimation Method for TDS-OFDM Based Chinese DTTB System," IEEE Trans. Consum. Electron., vol. 55, no. 3, Aug. 2009, pp. 1135-1140. https://doi.org/10.1109/TCE.2009.5277967
  12. G. Liu and J. Zhang, "ITD-DFE Based Channel Estimation and Equalization in TDS-OFDM Receivers," IEEE Trans. Consum. Electron., vol. 53, no. 2, May 2007, pp. 304-309. https://doi.org/10.1109/TCE.2007.381692

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