Sampling Synchronization for OFDM-Based System with Unified Reference Clock

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 202)

Abstract

Due to the constraint of cost and size for mobile wireless communication terminals, many orthogonal frequency division multiplexing (OFDM) based systems required the same crystal driving the sampling and the channel frequency, which lead to the challenge of a more comprehensive sampling clock synchronization scheme needed. In this chapter, we proposed a two-stage scheme of sampling clock synchronization based on theoretical derivation: The preliminary sampling frequency offset(SFO) was jointly acquired with the carrier frequency offset by using the improved preamble-aided algorithm firstly. Secondly, the timing drift resulted from residual SFO and sampling timing error(STE) was derived together with performance analysis. The deviation properties of the estimation were achieved theoretically, which reveals that the variance of timing drift is in inverse proportion to SNR and grows linearly by square of the number of total subcarrier. The results of simulation show the proposed synchronization scheme can introduce preferable tracking and robust synchronizing performance for this kind of OFDM-based system.

Keywords

System synchronization Sampling clock error Joint estimation Timing drift 

References

  1. 1.
    Ai Bo, Yang Zhixing, Pan Changyong et al. (2006) On the synchronization techniques for wireless OFDM systems. IEEE Trans Broadcast 52(2):236–244Google Scholar
  2. 2.
    Yang BaoGuo, Letaief KB, Roger S (2000) Timing recovery for OFDM transmission. IEEE J Sel Areas Comm 18(22):2278–2291Google Scholar
  3. 3.
    Pollet T, Spruyt P, Moeneclaey M (1994) The BER performance of OFDM systems using nonsynchronized sampling. In: Proceedings of IEEE Globecom’94, vol 1, San Francisco, Dec 1994, pp 253–257Google Scholar
  4. 4.
    Kim J, Powers EJ, Cho Y (2002) A nonsynchronized sampling scheme. In: Proceedings of the 36th Asilomar conference on signals, systems and computers, vol 2, Pacific Grove, Nov 2002, pp 1900–1904Google Scholar
  5. 5.
    Lee H, Lee J (2011) Joint clock and frequency synchronization for OFDM-based cellular systems. IEEE Signal Process Lett 18(12):757–760CrossRefGoogle Scholar
  6. 6.
    Del Castillo-Sanchez E, Lopez-Martinez FJ et al (2009) Joint time, frequency and sampling clock synchronization for OFDM-based systems. In: Wireless communications and networking conference, vol 1, Budapest, Apr 2009, pp 1–6Google Scholar
  7. 7.
    Sliskovic M (2001) Carrier and sampling frequency offset estimation and correction in multicarrier systems. In: Proceedings of IEEE global telecommunications conference, vol 1, San Antonio, Sept 2001, pp 285–289Google Scholar
  8. 8.
    Moose PH (1994) A technique for orthogonal frequency division multiplexing frequency offset correction. IEEE Trans Comm 42(10):2908–2914CrossRefGoogle Scholar
  9. 9.
    ITU-R M.1225 (1997) Guidelines for evaluation of radio transmission technologies for IMT-2000. www.itu.int

Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.Key Laboratory of Universal Wireless CommunicationsMinistry of Education, Beijing University of Posts and TelecommunicationsBeijingChina

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