Exploiting cyclic prefix redundancy in OFDM to improve performance of Tanner: graph based decoding



Redundancy, which is added in transmitter in standard OFDM in the form of a cyclic prefix is usually discarded in the receiver. However, it can be interpreted as a repetition code, which repeats only part of the symbols. Therefore it is a rather weak error control code. Nevertheless the receiver could be modified to implement a signal processing technique using this redundancy, which allows increasing error correcting capability of an outer code. A powerful outer code is usually present in any transmission adhering to some of the modern digital communication standards such as IEEE 802.16 WiMax or ETSI LTE specification family. The details on such a modification and some corresponding simulations results were presented in Palenik and Farkas (SDR’10 Technical Conference and Product Exposition, Washington DC, 2010). This manuscript is an extended version of Palenik and Farkas (SDR’10 Technical Conference and Product Exposition, Washington DC, 2010). Additional new simulation results are presented, which investigate the effects of varying prefix size on overall system error performance in both AWGN and Rayleigh fading channels. A discussion on practical usability and limitations of described receiver modification is also presented.


OFDM Cyclic prefix Convolution matrix Iterative decoding 


  1. 1.
    Palenik, T., & Farkas, P. (2009). Exploiting redundancy in an OFDM SDR receiver. International Journal of Digital Multimedia Broadcasting, 2009, Article ID 194148. doi:10.1155/2009/194148. Retrieved June 7, 2011 from http://downloads.hindawi.com/journals/ijdmb/2009/194148.pdf.
  2. 2.
    Palenik, T., & Farkas, P. (2010). Exploiting cyclic prefix redundancy in OFDM to improve decoding of LDPC code. In SDR’10 Technical Conference and Product Exposition, Dec 2010, Washington, DC.Google Scholar
  3. 3.
    Palenik, T. (2010). Communication system design based on SDR platform: Exploiting the redundancy of an OFDM system—a dissertation, Slovak University of Technology [in Slovak].Google Scholar
  4. 4.
    Moqvist, P. (1999). Serially concatenated systems: An iterative decoding approach with application to continuous phase modulation. Goteborg, Sweden: Chalmers University of Technology.Google Scholar
  5. 5.
    Berrou, C., Glavieux, A., & Thitimajshima, P. (1993). Near Shannon limit error-correcting coding and decoding: Turbo-codes. In Proc. IEEE International Conference on Communications ICC 93, Geneva (Vol. 2, pp. 1064–1070).Google Scholar
  6. 6.
    Bahai, A. R. S., Saltzberg, B. R., & Ergen, M. (2004). Multi carrier digital communications: Theory and applications of OFDM. New York: Springer. ISBN 0-387-22575-7.Google Scholar
  7. 7.
    Huang, X. (2006). Single-scan Min–Sum algorithms for fast decoding of LDPC codes. In IEEE Information Theory Workshop ITW ’06, Chengdu, Oct 2006 (pp. 140–143).Google Scholar
  8. 8.
    IEEE Std 802.16-2009. (2009). IEEE standard for local and metropolitan area networks part 16: Air interface for fixed and mobile broadband wireless access systems. New York: The Institute of Electrical and Electronics Engineers. ISBN 978-0-7381-5919-5 STD95914.Google Scholar
  9. 9.
    Roberts, R. A., & Mullis, C. T. (1987). Digital signal processing. Reading: Addison-Wesley. ISBN 978-0201163506.MATHGoogle Scholar
  10. 10.
    WiMAX Forum. (2006). Mobile WiMAX—Part I: A technical overview and performance evaluation. Retrieved June 7, 2011 from http://www.wimaxforum.org/technology/downloads/Mobile_WiMAX_Part1_Overview_and_Performance.pdf.
  11. 11.
    ITU-R Recommendation M.1225. (1997). Guidelines For evaluation of radio transmission technologies for IMT-2000, ITU.Google Scholar
  12. 12.
  13. 13.
    Superiori, L. et al. (2007). Cross-layer detection of visual impairments in H.264/AVC video sequences streamed over UMTS networks. In Proc. International Workshop on Cross Layer Design IWCLD ‘07 (pp. 96–99). China: Jinan.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of TelecommunicationsSlovak University of TechnologyBratislavaSlovakia

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