Performance Analysis of Groupwise Serial Interference Cancellation(GSIC) for W-CDMA System with Coherent Detection

동기복조 방식의 W-CDMA 시스템을 위한 그룹단위 직렬간섭제거(GSIC) 알고리즘의 성능해석

  • 구제길 (용인송담대학 디지털전자정보과) ;
  • 최형진 (성균관대학교 전기·전자 및 컴퓨터공학과)
  • Published : 2001.04.01

Abstract

This paper proposes the groupwise serial cross interference cancellation(GSCIC) algorithm for coherent detection and analyzes the groupwise serial block interference cancellation(GSBIC) and GSCIC algorithm for an asynchronous wideband DS-CDMA system in a single cell over multipath fading channels. In general, the GSIC algorithm can be grouped into two classes: i.e., GSBIC and GSCIC algorithm. In this paper, the proposed GSCIC algorithm is to improve the performance of the GSBIC algorithm. We compare the performance of the GSCIC and existing GSBIC algorithm in a multipath fading channel to that of the existing SIC algorithm. As a result, the performance of GSCIC algorithm is somewhat better compared with the GSBIC algorithm according to reduction factor $R_{f}$ and is similar to that of the SIC algorithm. And also, the GSBIC and GSCIC algorithms have the advantage that it can be analyzed system performance easily, changing the number of users within a user group according to system capacity.

본 논문은 동기복조 방식의 그룹단위 직렬 교차 간섭제거(GSCIC; Groupwise serial cross interference cance-llation) 알고리즘을 제안하고, 기존 GBSIC(Groupwise serial block interference cancellation) 알고리즘과 함께 다중경로 페이닝 채널에서 단위 셀 비동기 W-CDMA 시스템 역방향 링크에 적용하여 해석하였다. 그룹단위 직렬 간섭제거 알고리즘(GSIC; Groupwise serial interference cancellation)은 일반적으로 그룹단위 직렬 블록 간섭제거(GSBIC) 알고리즘과 그룹단위 직렬 교차 간섭제거(GSCIC) 알고리즘으로 나눌 수 있다. 본 논문에서는 GSCIC 제안 알고리즘은 기존 GSBIC 알고리즘을 개선한 것이다. 다중 경로 페이딩 채널에서 GSBIC 알고리즘은 감소인자 $R_{f}$에 따라 GSBIC 알고리즘보다 우수한 성능을 얻었고, 직렬 간섭제거 알고리즘과 비슷한 성능을 얻었다. 한편, GSBIC와 GSCIC 알고리즘은 시스템 처리 능력에 따라 그룹 내 사용자 수를 가변하면서 성능을 쉽게 분석할 수 있는 장점을 갖고 있다.

Keywords

References

  1. IEEE Trans. on Information Technology v.32 no.1 Minimum probability of error for asynchronous Gaussian multiple- access channels S. Verdu
  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
  3. IEEE J. Selected Areas in Comm. v.12 no.5 Performance analysis of DS/CDMA noncoherent M-ary orthogonal modulation in multipath fading channels L. M. A. Jalloul;J. M. Holtzman
  4. Proceedings of IEEE VTC Successive interference cancellation in multiple data rate DS/CDMA systems A-L. Johansson;A. Svensson
  5. Proceedings of IEEE PIMRC Groupwise successive interference cancellation in a DS/CDMA system F. Wijk;G. M. J. Janssen;R. Prasad
  6. Digital Communications J. G. Proakis
  7. IEEE Communication Letter v.2 no.3 Evaluation of a DS/CDMA multiuser receiver employing a hybrid form of interference cancellation in Rayleigh-fading channels D. Koulakiotis;A. H. Aghvami
  8. Proceedings of IEEE ICT v.2 Hybrid interference cancellation a multiuser detection scheme for W-DS/CDMA systems D. Koulakiotis;A. H. Aghvami
  9. Technical specifications of physical channels and mapping of transport channels onto physical channels(FDD) 3GPP