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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Study on the New Hybrid Interference Cancellation Scheme for Multirate DS-CDMA

다중전송률 DS-CDMA 시스템을 위한 새로운 하이브리드 간섭제거기

  • 김남선 (대진대학교 통신공학과)
  • Published : 2004.09.01
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Abstract

The objective of this paper is to proposed a new Hybrid Interference Cancellation(HlC) receiver to cancel MAI in a multirate DS-CDMA system based on multiple processing gain(MPG). We propose a new improved HIC scheme that divides the active users with different data rates split into a number of groups for effectives cancellation Between each group, GW-PIC is performed to cancel other group signals and within them, SIC is carried out to remove multiple access interference in group. We analyze the performance of the proposed receiver in terms of the bit error rate(BER) and examine its performance. As a conclusion, computer simulations show that the proposed schemes outperforms adaptive multistage PIC and conventional SIC receiver over AWGN channel.

본 논문에서는 다중처리이득 기법을 사용한 비동기 다중 전송률 DS-CDMA 시스템에서 발생하는 다중접속 간성을 제거하기 위한 새로운 하이프리도 수신기를 제안한다. 효과적인 간섭제거를 위해, 서로 다른 전송률을 갖는 사용자들을 그룹화 하여 간섭을 제거할 수 있는 새로운 하이브리드 간섭제거 방식을 제시하였다. 즉, 그룹화를 통해 그룹 간에는 병렬 간섭제거방식을 사용하여 그룹간의 간섭을 일차적으로 제거하며 그룹 내에는 직렬 간섭제거방식을 적용하여 그룹 내 사용자간의 간성을 제거하였다. 제안된 시스템을 가우시안 잡음환경 하에서 오류확률을 구했으며, 기존 직렬 간섭제거 방식이나 적응 다단 병렬 간섭제거방식과의 성능비교를 통해 제안된 시스템의 성능이 우수한 것을 알 수 있었다.

Keywords

References

  1. G. Q. Xue, J. F. Weng, T. Le-Ngoc and S. Tabar, Multiuser detection techniques: An overview, Technical Repon, Department of Electrical and Computer Engineering, Concordia University, Canada, Oec., 1998
  2. T. Ottoson and A. Svensson, Multi-rate Schemes in DS/CDMA Systems, Proceedings IEEE VTC'95, Chicago, pp. 1006-1010, July 1995
  3. T. Ottoson and A. Svensson, On Schemes for Multirate Support in DS-CDMA Systems, Wireless Personal Commun., Kluwer Academic Publishers, Vol. 6, pp. 265-287, Mar. 1998 https://doi.org/10.1023/A:1008844314164
  4. P. Patel and J. Holtzman, Analysis of a Simple Successive Interference Cancellation Scheme in a DS/CDMA System,' IEEE J. on Selected Areas in Communications, Vol. 12, No.5, pp. 796-807, June 1994 https://doi.org/10.1109/49.298053
  5. Ashish Kaul and Brian D. Woerner, An Analysis of Adaptive Multistage Interference Cancellation for CDMA,' VTC 1995, Vol. 1, pp. 82-86, July 1995
  6. S. Sun, L.K. Rasmussen, H. Sugimoto and T.J. Lim, A Hybrid Interference Canceller in CDMA,' IEEE ISSSTA, Vol.1, pp. 150-154, Sept. 1998
  7. R. Malik, V.K. Dubey and B. McGUffm, A hybrid interference canceller for CDMA systems in Rayleigh fading channels,' VTC 2001, Vol. 2, pp.1523-1527, May 2001
  8. C.S. Wijting, T. Ojanpera, M. Juntti, K. Kansanen and R. Prasad, Groupwise serial multiuser detectors for multirate DS-CDMA,' VTC '99, Vol. 1, pp. 836-840, May 1999
  9. N. Prapavong and W. Benjapolakul, Improvement of partial interference cancellation receiver using variance from matched filter for weight factor assignment and adaptation in multirate CDMA cellular mobile communication systems,' SPAWC '01, pp. 210-213, March 2001
  10. C.S. Wijting, T. Ojanpera, M. Juntti, K. Kansanen and R. Prasad, Groupwise serial multiuser detectors for multirate DS-CDMA,' VTC '99, Vol. 1, pp. 836-840, May 1999
  11. M. B. Pursley, Performance Evaluation for Phase-coded Spread Spectrum Multiple Access Communication-Part I: System Analysis,' IEEE Trans. Comm., Vol. COM-25, No.8, pp.795-799, Aug. 1997
  12. Gao Xue and Li Chengshu, Performance of Partial Interference Cancellation in DS-CDMA 1226 System with Delay Estimation Errors,' PIMRC 2000, Vol. 2, pp.1518-1521, Aug 2000