The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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An Improved ToA Estimation in a Compressed Sensing-based UWB System

압축센싱 기반의 UWB 시스템에서 개선된 ToA 추정 기법

  • 르나탄 (숭실대학교 정보통신공학부 통신 및 정보처리 연구실) ;
  • 김광열 (숭실대학교 정보통신공학부 통신 및 정보처리 연구실) ;
  • 신요안 (숭실대학교 정보통신공학부 통신 및 정보처리 연구실)
  • Received : 2011.04.25
  • Accepted : 2011.06.08
  • Published : 2011.06.30
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Abstract

Since the first arrival path may not be the strongest path of UWB(Ultra Wide Band) multipath channels, this makes ToA(Time-of-Arrival) estimation becomes a challengeable issue. Furthermore, because of ultra bandwidth of received signals, the compressed sensing theory is employed to reduce the complexity caused by very high Nyquist sampling rate in coherent UWB receivers. In this paper, we propose a ToA estimation scheme which provides precise estimation performance, while exploiting the benefits of compressed sensing-based UWB receivers. Simulation results show that the proposed scheme can outperform other low complexity schemes in a wide range of signal-to-noise ratios.

UWB(Ultra Wide Band) 다중경로 채널에서 첫번째 경로를 통해 수신되는 신호가 가장 큰 신호가 아닐 경우가 종종 있으며, 이러한 경우 ToA(Time-of-Arrival) 추정의 정밀도를 유지하는 것은 매우 어려운 문제가 된다. 또한 UWB 신호의 초광대역 특성상 동기식 시스템을 구현할 경우 수신기는 매우 높은 표본화율을 이용해 신호를 수신해야 하기 때문에 복잡도가 증가되는데, 압축센싱(Compressed Sensing) 이론을 이용함으로써 시스템의 복잡도를 효율적으로 낮출 수 있다. 이에 본 논문은 압축센싱 기반의 UWB 수신기의 장점을 이용하면서도 정밀 추정성능을 제공할 수 있는 개선된 ToA 추정 기법을 제안한다. 모의실험 결과를 통해 광범위한 신호대잡음비 환경에서 제안된 기법이 다른 저복잡도 기법들의 성능보다 우수함을 확인하였다.

Keywords

Acknowledgement

Supported by : 정보통신산업진흥원

References

  1. Federal Communications Commission, "Revision of Part 15 of the Commission's rules regarding ultra-wideband transmission," ET Docket 98-153, Apr. 2002.
  2. M. Z. Win and R. A. Scholtz, "Impulse radio: How it works," IEEE Commun. Lett., Vol. 2, No. 2, pp. 36-38, Feb. 1998. https://doi.org/10.1109/4234.660796
  3. D. L. Donoho, "Compressed sensing," IEEE Trans. Info. Theory, Vol. 52, No. 4, pp. 1289-1306, Apr. 2006. https://doi.org/10.1109/TIT.2006.871582
  4. J. L. Parades, G. R. Arce, and Z. Wang, "Compressed sensing for ultrawideband impulse radio," Proc. IEEE ICASSP 2007, Vol. 3, pp. 553-556, Honolulu, USA, Apr. 2007.
  5. J. L. Paredes, G. R. Arce, and Z. Wang, "Ultra-wideband compressed sensing: Channel estimation," IEEE Jour. Signal Proc., Vol. 1, No. 3, pp. 383-395, Oct. 2007.
  6. J. Y. Lee and R. A. Scholz, "Ranging in a dense multipath environment using an UWB radio link," IEEE Jour. Selected Areas in Commun., Vol. 20, No. 9, pp. 1677-1683, Dec. 2002. https://doi.org/10.1109/JSAC.2002.805060
  7. I. Guvenc, S. Gezici, and Z. Sahinoglu, "Ultra-wideband range estimation: Theoretical limits and practical algorithms," Proc. IEEE ICUWB 2008, Vol. 3, pp. 93-96, Hannover, Germany, Sept. 2008.
  8. D. Dardari, C. C. Chong, and M. Z. Win, "Threshold-based time-of-arrival estimators in UWB dense multipath channels," IEEE Trans. Commun., Vol. 56, No. 8, pp. 1366-1378, Aug. 2008. https://doi.org/10.1109/TCOMM.2008.050551
  9. I. Guvenc and Z. Sahinoglu, "Threshold-based TOA estimation for impulse radio UWB systems," Proc. IEEE ICU 2005, pp. 420-425, Zurich, Switzerland, Sept. 2005.
  10. I. Guvenc, Z. Sahinoglu, A. F. Molisch, and P. Orlik, "Non-coherent TOA estimation in IR-UWB systems with different signal waveforms," Proc. IEEE BROADNETS 2005, Vol. 2, pp. 1168-1174, Boston, USA, Oct. 2005.
  11. J. R. Foerster, "The effects of multipath interference on the performance of UWB systems in an indoor wireless channel," Proc. IEEE VTC 2001-Spring, pp. 1176-1180, Rhodes, Greece, May 2001.
  12. R. G. Baraniuk, "Compressive sensing," IEEE Signal Proc. Mag., Vol. 24, No. 4, pp. 118-121, July 2007.
  13. J. Tropp and A. C. Gilbert, "Signal recovery from random measurements via orthogonal matching pursuit," IEEE Trans. Info. Theory, Vol. 53, No. 12, pp. 4655-4666, Dec. 2007. https://doi.org/10.1109/TIT.2007.909108
  14. IEEE 802.15 TG 4a Channel Model Subcommittee, "IEEE 802.15.4a channel model - Final report," available at http://www.ieee802.org/15/pub/TG4a.html.