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

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

Effects of Multiple Threshold Values for PN Code Acquisition in DS-CDMA Systems

PN 코드 동기획득에서 다중 임계치의 효과

  • Lee, Seong-Ju (Dept.of Electric Electronics Engineering, Yonsei University) ;
  • Kim, Jae-Seok (Dept.of Electric Electronics Engineering, Yonsei University)
  • 이성주 (연세대학교 전기전자공학과) ;
  • 김재석 (연세대학교 전기전자공학과)
  • Published : 2002.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, a decision method using multiple threshold values for PN code acquisition in Direct Sequence Code Division Multiple Access (DS-CDMA) systems is described. We apply this technique to the conventional double dwell serial search algorithm and analyze it in terms of mean code acquisition time. For the analysis, we present mathematical model of proposed algorithm and also perform the simulation under IMT-2000 channel models. Numerical results show that our proposed scheme outperforms the conventional one by 0.2 - 0.5 sec with respect to the mean code acquisition time because multiple threshold values mitigate the possible decline in search performance caused by the use of a single threshold.

본 논문에서는 직접확산 코드분할 다중접속 시스템의 PN 코드 동기획득에서 다중 임계치를 사용하는 결정방식에 대해서 설명하기로 한다. 본 논문에서 제안하는 다중 임계치 결정방식을 이중적분 직렬동기획득 알고리듬에 적용하고, 평균 동기획득 시간 측면에서 분석한다. 분석을 위해, 제안된 방식의 수학적 모델을 제시하고, IMT-2000 채널모델에서 시뮬레이션을 수행한다. 수식적인 분석 결과는 제안된 방식이 한 쌍의 임계치를 사용하는 기존 방식에 비해 평균 동기획득 시간에서 약 0.2초 내지 0.5초 정도의 성능향상을 가져오는 것을 보여준다. 이것은 다중 임계치가 하나의 임계치를 사용함으로써 발생했던 탐색 성능 저하를 보상할 수 있기 때문이라고 볼 수 있다.

Keywords

References

  1. K. S. Gilhousen, et al., On the capacity of a cellular CDMA system, IEEE Trans. on Vehicular Tech., Vol. 40, No. 2, pp. 303-312, May 1991 https://doi.org/10.1109/25.289411
  2. Douglas N. Knisely, Sarath Kumar, Subhasis Laha, and Sanjiv Nanda, Evolution of Wireless Data Services : IS-95 to cdma2000, IEEE Communications Magazine, pp. 140-148, October 1998 https://doi.org/10.1109/35.722150
  3. W. C. Y. Lee, Spectrum and Technology of a Wireless Local Loop System, IEEE Personal Comm., Vol.5, No.1, pp. 49-54, 1998, 2. 1 https://doi.org/10.1109/98.656162
  4. Laurence B. Milstein, John Gevargiz, and Pankaj K. Das, 'Rapid Acquisition for Direct Sequence Spread-Spectrum Communications Using Parallel SAW Convolvers,' IEEE Trans. on Comm. Vol. 33, No. 7, pp. 593-600, July 1985 https://doi.org/10.1109/TCOM.1985.1096354
  5. Essam Sourour and Cupta. S. C, Direct sequence spread spectrum parallel acquisition in a fading mobile channel, IEEE Trans. on Comm., Vol 38, No. 7, pp. 992-998, 1990 https://doi.org/10.1109/26.57497
  6. Weihua Zhuang, An improved hybrid PN code acquisition for CDMA personal wireless communications, Proceedings of PIMRC95, pp. 995-999, May 1995 https://doi.org/10.1109/PIMRC.1995.477093
  7. HyungRae Park and Bubjoo Kang, On serial search Code Acquisition for Direct-Sequence Spread Spectrum System:An Application to IS-95 CDMA System, Proceedings of VTC95, Vol. 1, pp. 291-295, 1995 https://doi.org/10.1109/VETEC.1995.504875
  8. Seongjoo Lee and Jaeseok Kim, Optimum Threshold for Double-dwell DS-SS Code Acquisition System in PCS Channel Model, IEE Electronics Letters, Vol. 34, No. 7, pp. 634-635, 1998 https://doi.org/10.1049/el:19980116
  9. Biqi Long and Hichan Moon, Detection and false alarm probability of PN code acquisition, IEE Electronic Letters, Vol. 33, pp. 926-927, May 1997 https://doi.org/10.1049/el:19970623
  10. ITU-R M.1225, Guidelines for Evaluation of Radio Transmission Technique for IMT-2000
  11. Seongjoo Lee, Sangyun Hwang, and Jaeseok Kim, Low-complexity architecture of rake receiver for multi-code CDMA system, IEEE Electronics Letters, Vol. 34, No. 14, pp. 1382-1383, 1998 https://doi.org/10.1049/el:19980990
  12. Andrew J. Viterbi, CDMA : Principles of Spread Spectrum Comm., Addison-Wesley Pub., 1995