DS-UWB 시스템의 성능 향상 기법

Performance Improvement Techniques for a DS-UWB System

  • 박중후 (한양대학교 전자컴퓨터공학부 이동통신시스템 연구실)
  • 발행 : 2006.07.01

초록

본 논문에서는 시스템의 복잡도를 크게 증가시키지 않으면서 다중사용자 간섭과 다중 경로의 영향을 효과적으로 감소시킬 수 있는 DS-UWB 시스템 수신기를 제안하였다. 기존의 비동기식 DS-UWB 시스템 수신기는 확산코드의 종류와 길이에 따라 성능의 편차가 심하다. 일반적으로 확산코드의 길이가 증가하면 수신기의 성능도 따라서 향상되지만, 다중 경로의 영향을 받는 환경에서는 만족할만한 성능 향상을 도모할 수 없다. 제안된 수신기는 다중 사용자 다중 경로 페이딩 환경에서도 다중 경로의 영향을 효과적으로 제거할 수 있음을 여러 가지 컴퓨터 모의실험을 통해서 확인할 수 있었다. 또한 같은 조건에서 기존의 수신기에 비해 사용자수를 크게 증가시킬 수 있음을 확인할 수 있었다.

In this paper, a new receiver with low complexity for a DS-UWB system which can eliminate efficiently the multiple access interference and the detrimental effects caused by multi-paths is proposed. The performance of conventional DS-UWB receivers depends greatly on the types and lengths of spreading codes. Generally, as the length of spreading codes increases, the receiver performance improves. But, the receiver performance does not improve satisfactorily in a multi-paths fading environment. Through computer simulations, it can be shown that the proposed DS-UWB receiver eliminate the multi-paths effects efficiently in a multi-user, multi-paths fading environment, and the user capacity can be increased dramatically using the proposed receiver.

키워드

참고문헌

  1. Domenico Porcino and Walter Hirt, 'UltraWideband Radio Technology: Potential and Challenges' Ahead,' IEEE Commun. Mag., pp.66-74, July 2003
  2. Linqing Yang and Georgios B. Giannakis, 'Ultra-Wideband Communications: An Idea Whose Time Has Come,' IEEE Signal Proc. Mag., pp.26-54, November 2004 https://doi.org/10.1109/MSP.2004.1359140
  3. William M. Lovelace and J. Keith Townsend, 'The Effects of Timing Jitter and Tracking on the Performance of Impulse Radio,' IEEE Jourl. Selected Areas Commun., vol.20, no.9, pp.1646-1651, December 2002 https://doi.org/10.1109/JSAC.2002.805058
  4. John D. Choi and Wayne E. Stark, 'Performance of Ultra-Wideband Communications with Suboptimal Receivers in Multipath Channels,' IEEE Jourl. Selected Areas Commun., vol.20, no.9, pp.1754-1766, December 2002 https://doi.org/10.1109/JSAC.2002.805623
  5. Fernando Ramirez-Mireles, 'On the Performance of Ultra-Wide-Band Signals in Gaussian Noise and Dense Multipath,' IEEE Trans. Vehicular Tech., vol.50, no.l, pp.244-249, January 2001 https://doi.org/10.1109/25.917932
  6. Jeffrey R. Foerster, 'The Performance of a Direct-Sequence Spread Ultra-Wideband System in the Presence of Multipath, Narrowband Interference, and Multiuser Interference,' Proc. of IEEE Conf. on Ultra Wideband Systems and Technologies (UWBST), pp.87-91, 2002
  7. Maria-Gabriella Di Benedetto and Guerino Giancola, Understanding Ultra Wide Band Radio Fundamentals, Prentice Hall, 2004
  8. Joong-Hoo Park and William H. Tranter, 'Pseudo-Decorrelating Multiuser Receivers for Asynchronous Code Division Multiple Access (CDMA) Systems in a Rayleigh Fading Environment,' IEICE Trans. Commun., vol.E82-B, no.5, pp.721-730, May 1999
  9. Joong-Hoo Park and William H. Tranter, 'Pseudo-Decorrelating Multiuser Receivers for Asynchronous Code Division Multiple Access (CDMA) Systems,' IEICE Trans. Commun., vol.E81-B, no.11, pp.2197-2204, November 1998