대한전자공학회논문지TC (Journal of the Institute of Electronics Engineers of Korea TC)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

W-CDMA HSDPA수신기의 직렬간섭제거 알고리즘의 오류율 성능해석

BER performance analysis of successive interference cancellation(SIC) algorithm for W-CDMA HSDPA receiver

  • 구제길 (용인송담대학 디지털전자정보고)
  • Koo Je-Gil (Dept. of Digital Electronics & Information Eng., Yong-In SongDam College)
  • 발행 : 2004.01.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

논문은 W-CDMA 고속 다운링크 패킷접속(HSDPA: high-speed downlink packet access) 시스템에서 다중경로 간섭성분에 대해 직렬간섭제거(SIC successive interference cancellation) 알고리즘을 적용하여 오류율 성능을 유도하고 수치해석으로 성능을 분석한 것이다. 성능분석 결과에 의하면, 다중경로수가 증가함에 따라 오류율 성능이 급격하게 포화됨을 알 수 있었고, 확산이득(PG)이 증가할수록 성능향상이 매우 커짐을 확인하였다. 두개의 다중경로와 평균 오류율 $1.0{\times}10^{-3}$에서 확산이득 PG=64와 128의 경우 기존 검출방식에 비해 직렬간섭제거 성능이 각각 7dB와 1.4dB이상 우수함을 보였다. 파일럿 채널과 데이터 채널들에 할당하는 가중치가 '1'에 가까울수록 오류율 성능이 포화됨을 알 수 있었다. 그리고 다중코드수(K)가 증가할수록 다중경로수에 비례한 간섭전력 증가로 인해 성능저하가 커졌다. 또한 상대적으로 뒤에 도달한 다중경로의 페이딩 채널이득이 적을수록 성능이 향상됨을 알 수 있었다 이상과 같은 성능분석 결과에 따르면 고속전송을 위한 다중코드, 낮은 처리이득 및 채널 페이딩 등의 환경에서 성능향상을 위해서는 다중경로 간섭제거가 필수적임을 알 수 있었다.

This paper drives the exact expression of bit error rate(BER) performance for successive interference cancellation(SIC) algorithm against multipath interference components in a high-speed downlink packet access(HSDPA) system of W-CDMA downlink and the BER performance is evaluated by numerical analysis. Numerical results showed that the average BER performance is rapidly saturated in terms of increasing the number of multipath and is revealed significant improvement for improvement Processing gain(PG). For example, the average BER Performance of the SIC algorithm is superior to the performance of conventional scheme by more than 7dB and 1.4dB for processing gain PG=54 and 128 under the two-path channel and average BER=$1.0{\times}10^{-3}$, respectively. This results also indicated that the average BER saturation is occurred at nearly one weight factor which is assigned to pilot and data channels. Likewise, the average BER performance is greatly degraded due to increasing the interference power in proportional to the number of multipath with increasing multicode K. And the smaller multipath fading channel gain is arrived later, the more the average BER performance is improved. The results of performance analysis in this paper indicated that the multipath interference cancellation is required to improve the BER performance in a HSDPA system under multicode for high-speed packet transmission, low spreading factor, and multipath fading channel.

키워드

참고문헌

  1. 3GPP TR25.848 V4.0.0(2001.3), 'Physical layer aspects of UTRA high speed downlink packet access (Release 4)'
  2. 3GPP TR25.212 V5.2.0(2002.9), 'Technical specification group radio access network : spreading and modulation(FDD)(Release 5)'
  3. K. B. Letaief, J. C-I. Chuang, and R. D. Murch, 'Multicode high-speed transmission for wireless mobile communication' in Proc. IEEE VTC'95, pp. 1835-1839, 1995 https://doi.org/10.1109/GLOCOM.1995.502724
  4. D. -W. Hsiung and J. -F. Chang, 'Performance of multi-code CDMA in a multipath fading channel' IEE Proc. on comm., Vol. 147, No. 6, pp. 365-370, Dec. 2000 https://doi.org/10.1049/ip-com:20000686
  5. C-D. Iskander and P. T. Mathiopoulos, 'Performance of multicode DS/CDMA with noncoherent M-ary orthogonal modulation in multipath fading channels' in Proc. IEEE VTC'02, pp. 1210-1214, 2002
  6. S. I. Kim and H. S. Lee, 'Performance improvement of RAKE receiver for a multicode DS-CDMA system with multistage interference cancellation detectors' in Proc. IEEE TENCON'99, Vol. 1, pp. 573-576, Sept. 1999 https://doi.org/10.1109/TENCON.1999.818479
  7. R. Hu, A. Huang, H. Wang, and W. Gu, 'Multipath interference cancellation and modified RAKE receiver' in Proc. IEEE VTC'01, pp. 1508-1512, 2001 https://doi.org/10.1109/VETECS.2001.944639
  8. M. F. Madkour, S. C. Gupta, and Y. E. Wang, 'Successive interference cancellation for downlink W-CDMA communications' IEEE trans. on wireless comm., Vol. 1, No. 1, pp. 169-177, Jan. 2002 https://doi.org/10.1109/7693.975455
  9. J. Chen, J. Wang, and M. Sawahashi, 'MCI cancellation for multicode wideband CDMA systems' IEEE Journal on JSAC, Vol. 20, No. 2, pp. 450-462, Feb. 2002 https://doi.org/10.1109/49.983371
  10. K. Higuchi, A. Fujiwara, and M. Sawahashi, 'Multipath interference canceller for high-speed packet transmission with adaptive modulation and coding scheme in W-CDMA forward link' IEEE Journal on JSAC, Vol. 20, No. 2, pp. 419-432, Feb. 2002 https://doi.org/10.1109/49.983367
  11. H. Wang, V. Haikola, and J. Lilleberg, 'Advanced high-speed packet access receiver for WCDMA multicode transmissions with high-order modulation' in Proc. IEEE PIMRC'02, pp. 1068-1072, 2002