Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
권호 표지

Performance Analysis of the Multi-User Detector Employing a Hybrid Interference Cancellation Scheme in a WCDMA System

WCDMA 시스템에서 Hybrid Interference Cancellation 기법을 적용한 다중사용자 검파기의 성능분석

  • 서정욱 (전자부품연구원) ;
  • 오창헌 (한국기술교육대학교 정보기술공학부) ;
  • 장은영 (국립천안대학 전자과) ;
  • 조성준 (한국항공대학교 전자, 정보통신, 컴퓨터공학부)
  • Published : 2002.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, in order to know the effect of the interference, we have analyzed the BER (Bit Error Rate) performance of the MUD(Multi-User Detector) employing HIC(Hybrid Interference Cancellation) scheme for the asynchronous WCDMA system based on 3GPP(3rd Generation Partnership Project) Spec. through the In this paper, in order to know the effect of the interference, we have analyzed the BER (Bit Error Rate) performance of the MUD(Multi-User Detector) employing HIC(Hybrid Interference Cancellation) scheme for the asynchronous WCDMA system based on 3GPP(3rd Generation Partnership Project) Spec. through the computer simulation. we have assumed Rayleigh fading channel. And we have compared its BER performance with SIC's(Successive Interference Cancellation) and with PIC's(Parallel Interference Cancellation), which are the representative schemes in the subtractive interference cancellation. From the results, it is shown that PlC or HIC is effective for high data-rate users and SIC of HIC for low data-rate users to eliminate the interference. Regardless of the data rate, it is reasonable to use the HIC structure for WCDMA system to satisfy all of users' services. The reason is that the SIC scheme in front of HIC can guarantee the performance of low power users to cancel the serious interference caused by the high power users, while PIC in the rear of it can guarantee the performance of high power users to cancel the interference caused by the low power users.

본 논문에서는 3GPP(3rd Generation Partnership Project) 비동기(asynchronous) WCDMA(Wide-band CDMA) 시스템에 HIC(Hybrid Interference Cancellation) 기법의 MUD (Multi-User Detector)를 적용하여 Rayleigh 페이딩 채널에서 BER (Bit Error Rate) 성능을 컴퓨터 시뮬레이션을 통해 구하였다. 이 결과를 감산형 간섭제거기법의 대표적인 방식인 SIC(Successive Interference Cancellation) 기법, PIC(Parallel Interference Cancellation) 기법의 BER(Bit Error Rate) 성능과 비교 분석하였다. 분석한 결과, 전송률이 높은 사용자들은 PIC 기법이나 HIC 기법을 사용하여 간섭을 제거하는 것이 효과적이고, 전송률 이 낮은 사용자들은 SIC 기법이나 HIC 기법을 사용하는 게 효과적이라는 것을 알 수 있었다. 또한, 전송률에 의존하지 않고 모든 사용자의 성능을 고루 만족시키기 위해서는 HIC 구조를 사용하는 것이 효과적이었다. 그 이유로서는 페이딩 채널상의 이유에서 또는 원하는 서비스를 만족시키기 위해서 사용자가 전력을 높일지라도 HIC 기법에서는 전단에 사용하는 SIC에 의해 전력이 낮은 사용자들의 성능을 보장해주고 후단에 사용하는 PIC에 의해 SIC 과정에서 전력이 센 사용자가 받는, 전력이 약한 사용자로부터의 간섭이 효과적으로 제거되기 때문이다.

Keywords

References

  1. Tero Ojanporä and Ramjee Prasad, Wideband CDMA for Third Generation Mobile Communications. Artech House, 1998
  2. S. Moshavi, 'Multi-user detection for DS-CDMA communications,' IEEE Commun. Magazine, vol. 3, no. 4, pp. 124-136, Oct. 1996
  3. A. D. Hallen, J. Holtzman, and Z. Zvonar, 'Multiuser detection for CDMA systems,' IEEE Personal Commun., vol. 2, pp. 46-58, Apr. 1995 https://doi.org/10.1109/98.382531
  4. S. Verdu, Multiuser Detection. Cambrideg Univ. Press, 1998
  5. P. R. Patel and J. M. Holtzman, 'Analysis of a DS/CDMA successive interference cancellation scheme using correlations,' IEEE GLOBE-COM'93, vol. 1, pp. 76-80, 1993
  6. N. S. Correal, R. M. Buehrer and B. D. Woerner, 'Improved CDMA performance through bias reduction for parallel interference cancellation,' 8th IEEE Intern. Symp. on PIMRC'97, vol. 2, pp. 565-569, 1997
  7. S. H. Han and J. H. Lee, 'Performance of multi-rate DS/CDMA system with multi-stage partial interference cancellation,' in Proc. IEEE VTC′2000., vol. 2, pp. 765-768, May 2000
  8. H. Holma and A. Toskala, WCDMA for UMTS. John Wiley & Sons, 2000
  9. 3G TS 25.213 v3.2.0, 'Spreading and modulation (FDD),' March 2000
  10. D. Koulakiotis and A. H. Aghvami, 'Evaluation of a DS-CDMA multiuser receiver employing a hybrid form of interference cancellation in Rayleigh fading channels,' IEEE Commun. Letters, vol. 2, no. 3, pp. 61-63, Mar. 1998 https://doi.org/10.1109/4234.662627
  11. Tik-Bin Oon, Raymond Steele, and Ying Li, 'Performance of an adaptive successive serial-parallel CDMA cancellation scheme in flat Rayleigh fading channels,' IEEE Trans. on Vehic. Tech., vol. 49, no. 1, pp. 61-63, Jan. 2000 https://doi.org/10.1109/25.820705
  12. M. J. Juntti,' Multiuser detector performance comparison in multirate CDMA systems,' in Proc. IEEE VTC′98, vol. 1, pp. 31-35, May 1998