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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Performance analysis of iterative groupwise equal-delay interference cancellation(IGEIC) for multiuser detection of coherent W-CDMA system

동기복조 W-CDMA 시스템의 다중 사용자 검출을 위한 반복 그룹단위 등지연 간섭제거(IGEIC) 알고리즘 성능해석

  • 구제길 (용인송담대학 디지털전자정보과) ;
  • 최형진 (성균관대학교 전기·전자 컴퓨터 공학부 통신시스템 연구실)
  • Published : 2002.03.01
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Abstract

This paper proposes and analyzes the iterative groupwise equal-delay interference cancellation(IGEIC) algorithm for coherent detection of an asynchronous wideband DS-CDMA system in a single cell over multipath fading channels. The IGEIC algorithm divide users in a system into several groups, and subtract out interference signal from the received signal as many as the number of users within a user group, iteratively. The IGEIC algorithm is also classified into the iterative groupwise equal-delay serial interference cancellation(IGESIC) algorithm and the iterative groupwise equal-delay parallel interference cancellation(IGEPIC) algorithm. In the case of perfect correlation for spreading codes, it shows that the performance of IGESIC and IGEPIC algorithm is the same after interference cancellation of as many as the number of users within a user group, but the performance of IGEPIC algorithm is superior to the IGESIC algorithm just before fecal cancellation within a user group. The results show that (he performance of the two proposed algorithms are also superior to the SIC algorithm by 3dB.

본 논문은 단위 셀 비동기 W-CBMA 시스템 역방향 링크의 다중경로 페이딩 채널에서 동기복조 방식의 다중 사용자 검출을 위한 반복 그룹단위 등지연 간섭제거 (IGEIC : iterative group-wise equal-delay interference cancellation) 알고리즘을 제안하고 성능을 해석하였다. IGEIC 알고리즘은 사용자를 그룹단위로 나누고, 그룹내에서 사용자 수만큼 반복해서 간섭을 제거한 다음, 다시 재확산시켜 다른 사용자 신호성분을 제거한다. IGEIC 알고리즘은 반복 그룹단위 등지연 직렬 간섭제거(IGESIC)와 반복 그룹단위 등지연 병렬 간섭제거(IGEPIC) 알고리즘으로 나누어 제안하였다. 확산부호의 완벽한 상관조건에서 그룹내 사용자 수만큼 간섭제거 후의 IGESIC와 IGEPIC 알고리즘 성능은 동일하며, 그룹내 사용자 수만큼의 간섭제거 직전의 성능은 IGEPIC 알고리즘이 IGESIC 알고리즘보다 우수하다. 또한 두 가지 제안 알고리즘 성능은 직렬 간섭제거 알고리즘 성능보다 3dB 이상 우수한 결과를 얻었다.

Keywords

References

  1. IEEE Trans. on Information Technology v.32 no.1 Minimum Probability of Error for Asynchronous Gaussian Multiple-Access Channels S. Verdu https://doi.org/10.1109/TIT.1986.1057121
  2. IEEE J. Selected Areas in Comm. v.12 no.5 Analysis of a Simple Successive Interference Cancellation Scheme in a DS/CDMA Systems P. R. Patel;J. M. Holtzman https://doi.org/10.1109/49.298053
  3. Proceedings of IEEE VTC Successive Interference Cancellation in Multiple Data Rate DS/CDMA Systems A-L. Johansson;A. Svensson
  4. IEEE Trans. on Comm. v.44 no.10 Analysis of Adaptive Multistage Interference Cancellation for CDMA Using an Improved Gaussian Approximation R. M. Buehrer;B. D. Woerner https://doi.org/10.1109/26.539771
  5. IEEE J. Selected Areas in Comm. v.14 no.8 Analysis of DS-CDMA Parallel Interference Cancellation with Phase and Timing Errors R. M. Buehrer;A. Kaul;S. Striglis;B. D. Woerner https://doi.org/10.1109/49.539406
  6. IEEE Trans. on Comm. v.46 no.2 Improved Parallel Interference Cancellation for CDMA D. Divsalar;M. K. Simon;D. Raphaeli https://doi.org/10.1109/26.659484
  7. Proceedings of IEEE VTC Performance of an Adaptive Successive Serial-Parallel Interference Cancellation Scheme in Flat Rayleigh Fading Channels T-B. Oon;R. Steele;Y. Li
  8. IEEE Comm. Letters v.2 no.3 Evaluation of a DS/CDMA Multiuser Receiver Employing a Hybrid Form of Interference Cancellation in Rayleiigh-Fading Channels D. Koulakiotis;A. H. Aghvami https://doi.org/10.1109/4234.662627
  9. Proceedings of IEEE PIMRC Groupwise Successive Interference Cancellation in a DS/CDMA System F. Wijk;G. M. J. Janssen;R. Prasad
  10. Proceedings of IEEE PIMRC Iterative Multiuser Interference Canceller for DS-CDMA T. Okabe;S. Hirose;H. Murata;S. Yoshida
  11. Technical Specifications of Physical channels and mapping of transport channels onto Physical channels(FDD)(Version 2.0) 3GPP
  12. Digital Communications J. G. Proakis