This article is part of the series Ultra-Wideband Communication Systems: Technology and Applications.

Open Access Research Article

Multiuser Interference Mitigation in Noncoherent UWB Ranging via Nonlinear Filtering

Zafer Sahinoglu1* and Ismail Guvenc2

  • * Corresponding author: Zafer Sahinoglu

Author Affiliations

1 Mitsubishi Electric Research Labs, 201 Broadway Avenue, Cambridge, MA 02139, USA

2 Department of Electrical Engineering, University of South Florida, Tampa, FL 33620, USA

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EURASIP Journal on Wireless Communications and Networking 2006, 2006:056849 doi:10.1155/WCN/2006/56849


The electronic version of this article is the complete one and can be found online at: http://jwcn.eurasipjournals.com/content/2006/1/056849


Received:1 September 2005
Revisions received:13 April 2006
Accepted:13 June 2006
Published:13 September 2006

© 2006 Sahinoglu and Guvenc

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Ranging with energy detectors enables low-cost implementation. However, any interference can be quite detrimental to range accuracy. We develop a method that performs nonlinear filtering on the received signal energy to mitigate multiuser interference (MUI), and we test it over time hopping and direct sequence impulse radio ultra-wideband signals. Simulations conducted over IEEE 802.15.4a residential line of sight ultrawideband multipath channels indicate that nonlinear filtering helps sustain range estimation accuracy in the presence of strong MUI.

References

  1. Z Tarique, WQ Malik, DJ Edwards, Bandwidth requirements for accurate detection of direct path in multipath environment. Electronics Letters 42(2), 100–102 (2006). Publisher Full Text OpenURL

  2. MZ Win, G Chrisikos, NR Sollenberger, Performance of Rake reception in dense multipath channels: implications of spreading bandwidth and selection diversity order. IEEE Journal on Selected Areas in Communications 18(8), 1516–1525 (2000). Publisher Full Text OpenURL

  3. J Ellis, et al. IEEE P802.15.4a WPAN alternate PHY - PAR (January, 2004, doc), . : IEEE 802.15-04/048r1. http://www.ieee802.org/15/pub/TG4a.html webcite

  4. S Gezici, Z Tian, GB Giannakis, et al. Localization via ultra-wideband radios: a look at positioning aspects of future sensor networks. IEEE Signal Processing Magazine 22(4), 70–84 (2005)

  5. MZ Win, RA Scholtz, Impulse radio: how it works. IEEE Communications Letters 2(2), 36–38 (1998). Publisher Full Text OpenURL

  6. L Reggiani, GM Maggio, Rapid search algorithms for code acquisition in UWB impulse radio communications. IEEE Journal on Selected Areas in Communications 23(5), 898–908 (2005)

  7. J Yu, Y Yao, Detection performance of time-hopping ultrawideband LPI waveforms. Proceedings of IEEE Sarnoff Symposium, April 2005, Princeton, NJ, USA

  8. Z Tian, GB Giannakis, A GLRT approach to data-aided timing acquisition in UWB radios—part I: algorithms. IEEE Transactions on Wireless Communications 4(6), 2956–2967 (2005)

  9. Z Tian, GB Giannakis, A GLRT approach to data-aided timing acquisition in UWB radios—part II: training sequence design. IEEE Transactions on Wireless Communications 4(6), 2994–3004 (2005)

  10. W Chung, D Ha, An accurate ultra wideband (UWB) ranging for precision asset location. Proceedings of IEEE Conference on Ultra Wideband Systems and Technologies (UWBST '03), November 2003, Reston, Va, USA, 389–393

  11. R Fleming, C Kushner, G Roberts, U Nandiwada, Rapid acquisition for ultra-wideband localizers. Proceedings of IEEE Conference on Ultra Wideband Systems and Technologies (UWBST '02), May 2002, Baltimore, Md, USA, 245–249

  12. J-Y Lee, RA Scholtz, Ranging in a dense multipath environment using an UWB radio link. IEEE Journal on Selected Areas in Communications 20(9), 1677–1683 (2002). Publisher Full Text OpenURL

  13. RA Scholtz, J-Y Lee, Problems in modeling UWB channels. Proceedings of IEEE Conference Record of the Asilomar Conference on Signals, Systems and Computers, November 2002, Pacific Groove, Calif, USA 1, 706–711

  14. C Mazzucco, U Spagnolini, G Mulas, A ranging technique for UWB indoor channel based on power delay profile analysis. Proceedings of IEEE 59th Vehicular Technology Conference (VTC '04), May 2004, Milan, Italy 5, 2595–2599

  15. I Guvenc, Z Sahinoglu, TOA estimation with different IR-UWB transceiver types. Proceedings of IEEE International Conference on Ultra-Wideband (ICU '05), September 2005, Zurich, Switzerland, 426–431

  16. A Rabbachin, I Oppermann, Synchronization analysis for UWB systems with a low-complexity energy collection receiver. Proceedings of International Workshop on Ultra Wideband Systems; Joint with Conference on Ultra Wideband Systems and Technologies, May 2004, Kyoto, Japan, 288–292

  17. K Yu, I Oppermann, Performance of UWB position estimation based on time-of-arrival measurements. Proceedings of International Workshop on Ultra Wideband Systems; Joint with Conference on Ultra Wideband Systems and Technologies, May 2004, Kyoto, Japan, 400–404

  18. I Guvenc, Z Sahinoglu, Threshold-based TOA estimation for impulse radio UWB systems. Proceedings of IEEE International Conference on Ultra-Wideband (ICU '05), September 2005, Zurich, Switzerland, 420–425

  19. I Guvenc, Z Sahinoglu, AF Molisch, P Orlik, Non-coherent TOA estimation in IR-UWB systems with different signal waveforms. Proceedings of 1st IEEE/CreateNet International Workshop on Ultrawideband Wireless Networking (UWBNETS '05), July 2005, Boston, Mass, USA, 245–251 (invited paper) OpenURL

  20. I Guvenc, Z Sahinoglu, Threshold selection for UWB TOA estimation based on kurtosis analysis. IEEE Communications Letters 9(12), 1025–1027 (2005). Publisher Full Text OpenURL

  21. I Guvanc, Z Sahinoglu, Multiscale energy products for TOA estimation in IR-UWB systems. Proceedings of IEEE Global Telecommunications Conference (GLOBECOM '05), November-December 2005, St. Louis, Mo, USA 1, 209–213

  22. S Gezici, Z Sahinoglu, H Kobayashi, HV Poor, AF Molisch, A two-step time of arrival estimation algorithm for impulse radio ultrawideband systems. Proceedings of 13th European Signal Processing Conference (EUSIPCO '05), September 2005, Antalya, Turkey

  23. S Gezici, Z Sahinoglu, H Kobayashi, HV Poor, Ultra wideband geolocation. Ultrawideband Wireless Communications (John Wiley & Sons, New York, NY, USA, 2005)

  24. R Merz, C Botteron, PA Farine, Multiuser interference during synchronization phase in UWB impulse radio. Proceedings of IEEE International Conference on Ultra-Wideband (ICU '05), September 2005, Zurich, Switzerland, 661–666

  25. S Gezici, H Kobayashi, HV Poor, A comparative study of pulse combining schemes for impulse radio UWB systems. Proceedings of IEEE/Sarnoff Symposium on Advances in Wired and Wireless Communication, April 2004, Princeton, NJ, USA, 7–10

  26. S Gezici, H Kobayashi, HV Poor, AF Molisch, Optimal and suboptimal linear receivers for time-hopping impulse radio systems. Proceedings of International Workshop on Ultra Wideband Systems; Joint with Conference on Ultra Wideband Systems and Technologies, May 2004, Kyoto, Japan, 11–15

  27. WM Lovelace, JK Townsend, Chip discrimination for large near far power ratios in UWB networks. Proceedings of IEEE Military Communications Conference (MILCOM '03), 2003 2, 868–873

  28. E Fishler, HV Poor, Low complexity multi-user detectors for time hopping implse radio systems. IEEE Transactions on Signal Processing 52(9), 2561–2571 (2004). Publisher Full Text OpenURL

  29. AF Molisch, K Balakrishnan, D Cassioli, et al. IEEE 802.15.4a channel model—final report (doc: IEEE 802, 2005), . 15-04-0662-02-004a. http://www.ieee802.org/15/pub/TG4a.html webcite

  30. HG Şenel, RA Peters II., B Dawant, Topological median filters. IEEE Transactions on Image Processing 11(2), 89–104 (2002). PubMed Abstract | Publisher Full Text OpenURL

  31. NC Gallagher Jr.., GL Wise, Theoretical analysis of the properties of median filters. IEEE Transactions on Acoustics, Speech, and Signal Processing 29(6), 1136–1141 (1981). Publisher Full Text OpenURL

  32. SM Kay, Fundamentals of Statistical Signal Processing: Detection Theory (Prentice Hall, Upper Saddle River, NJ, USA, 1998)

  33. L Yin, R Yang, M Gabbouj, Y Neuvo, Weighted median filters: a tutorial. IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing 43(3), 157–192 (1996). Publisher Full Text OpenURL