Skip to main content

Channel estimation in ECMA-368-based UWB systems with unknown interference


Ultra-wideband (UWB) is one of the fledging paradigms that the next generation of wireless personal area network (WPAN) is developing towards. With its appealing dimensions, UWB communication comes with a set of challenges of which channel estimation is prominent. In this article, we explore the problem of channel estimation in ECMA-368-based multiband orthogonal frequency division multiplexing (MB-OFDM) UWB system affected by unknown narrowband interference (NBI). We analytically show that the unknown NBI causes larger variance of a channel estimator. Thus, MB-OFDM UWB systems are supposed to experience significant performance degradation. To reduce this effect, we follow a new preamble-based channel estimation approach, where the interference power on each subcarrier is treated as a nuisance parameter which is averaged out from the corresponding likelihood function. The later is then optimized in an iterative manner according to the quasi-Newton algorithm. Furthermore, we address highly-accurate channel estimation in a time-variant channel and propose an iterative interpolation method. Simulation results indicate that our proposed approaches provide more precise estimation performances than those offered by conventional channel estimation methods.

This is a preview of subscription content, access via your institution.


  1. Standard ECMA-368: high rate ultra wideband PHY and MAC standard (2nd ed). ECMA International, December 2008.

  2. Snow, C., Lampe, L., & Schober, R. (2009). Impact of WiMAX interference on MB-OFDM UWB systems: analysis and mitigation. IEEE Transactions on Communications, 57(9), 2818–2827.

    Article  Google Scholar 

  3. Islam, S. M. R., & Kwak, K. S. (2010). A comprehensive study of channel estimation for WBAN-based healthcare systems: feasibility of using multiband UWB. Journal of Medical Systems, doi:10.1007/s10916-010-9617-6. Published Online: 03 November 2010.

    Google Scholar 

  4. Li, Y., Molisch, A. F., & Zhang, J. (2004). Practical approaches to channel estimation and interference suppression for OFDM based UWB communications. In IEEE 6th CAS symposium on emerging technologies: mobile and wireless communications Shanghai, China, 2004.

    Google Scholar 

  5. Tsai, Y.-r., Wang, C.-C., & Li, X.-S. (2008). Adaptive channel estimation for MB-OFDM systems in multi-access interfering environments, In IEEE vehicular technology conference (VTC), Singapore, May 2008.

    Google Scholar 

  6. Hadaschik, N., Zakia, I., Ascheid, G., & Meyr, H. (2007). Joint narrowband interference detection and channel estimation for wideband OFDM. In Proceedings of the European wireless conference.

    Google Scholar 

  7. Islam, S. M. R., & Kwak, K. S. (2011). Preamble-based improved channel estimation for multiband UWB system in presence of interferences. Telecommunication Systems, doi:10.1007/s11235-011-9440-5. Published Online: 09 April 2011.

    Google Scholar 

  8. Islam, S. M. R., & Kwak, K. S. (2011). Zero padded suffix aided subspace-based narrowband interference detected adaptive channel estimation for MB-OFDM UWB systems. International Journal of the Physical Sciences, 6(1), 52–64.

    Google Scholar 

  9. Morelli, M., & Moretti, M. (2009). Channel estimation in OFDM systems with unknown interference. IEEE Transactions on Wireless Communications, 8(10), 5338–5347.

    Article  Google Scholar 

  10. Molisch, A., Foerster, J., & Pendergrass, M. (2003). Channel models for ultra-wideband personal area networks. IEEE Wireless Communications Magazine, 12 14–21.

    Article  Google Scholar 

  11. Muquet, B., Wang, Z., Ginnakis, G., de Courville, M., & Duhamel, P. (2002). Cyclic prefix or zero padding for wireless multicarrier transmission? IEEE Transactions on Communications, 50(12), 2136–2148.

    Article  Google Scholar 

  12. Shi, K., Zhou, Y., Kelleci, B., Fischer, T. W., Serpdin, E., & Karsilayn, A. I. (2007). Impacts of narrowband interference on OFDM-UWB receivers: analysis and mitigation. IEEE Transactions on Signal Processing, 55(3), 1118–1128.

    Article  Google Scholar 

  13. Caravalho, E. D., & Slock, D. T. (1997). Cramer-Rao bounds for semi-blind, blind, and training sequence based channel estimation, In First IEEE signal processing workshop on signal processing advances in wireless communications, Paris, France, April 1997.

    Google Scholar 

  14. Nocedal, J., & Wright, S. J. (1999). Numerical optimization. Springer series in operation research (Springer, Berlin).

    Book  Google Scholar 

  15. Liu, H., Zhong, H., Zhang, T., & Gong, Z. (2006). A quasi-Newton acceleration EM algorithm for OFDM channel estimation. Information Technology Journal, 5(4), 749–752.

    Article  Google Scholar 

  16. Nam, S. H., Yoon, J. S., & Song, H. K. (2008). EM-based low complexity channel estimation for OFDM system. IEEE Transactions on Consumer Electronics, 54(2).

  17. Morelli, M., & Mengali, U. (2001). A comparison of pilot-aided channel estimation methods for OFDM systems. IEEE Transactions on Signal Processing, 49, 3065–3073.

    Article  Google Scholar 

  18. IEEE 802.15 Working Group for Wireless Personal Area Networks (WPANs): Time variance for UWB wireless channels, November 2002.

  19. Li, Y., Minn, H., Jacobs, T., & Win, M. Z. (2008). Frequency offset estimation for MB-OFDM-based UWB systems. IEEE Transactions on Communications, 56(6), 968–979.

    Article  Google Scholar 

  20. Keijo, P., & Koi, V. (2007). Iterative interpolation method for multiband-OFDM channel estimation. In IEEE International conference on ultra-wideband (ICUWB), Singapore, September 2007.

    Google Scholar 

  21. Sanguinetti, L., Morelli, M., & Poor, H. V. (2010). Frame detection and timing acquisition for OFDM transmissions with unknown interference. IEEE Transactions on Wireless Communications, 9(3), 1226–1276.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to Kyung Sup Kwak.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Islam, S.M.R., Ameen, M.A. & Kwak, K.S. Channel estimation in ECMA-368-based UWB systems with unknown interference. Telecommun Syst 52, 1159–1169 (2013).

Download citation

  • Published:

  • Issue Date:

  • DOI: