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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Effect of Cell Shape on Design of CDMA Systems for Urban Microcells

도심 MICROCELL의 CDMA 시스템 용량에 대한 기지국 배치 효과

  • 민승욱 (상명대학교 소프트웨어대학 소프트웨어학부) ;
  • 최진규 (홍익대학교 전자전기컴퓨터공학부 전자공학)
  • Published : 2007.03.31
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Abstract

Placing antennas of low power base stations below surrounding buildings, as in urban microcells, makes propagation characteristics strongly dependent on the building environment. As a result, propagation in these urban microcells is non-isotropic, so that the assumption of circular cells used in planning of conventional cellular sys toms is no longer valid. Assuming circular cells leads to a more conservative system design, implying more base stations. This work investigates the effect of cell shape, due to non-isotropic propagation, on the out-of-cell interference and Erlang capacity of CDMA system. Propagation is described by measurement derived models for low antennas in a rectangular urban street grid. The analysis is done for soft handoff protocols.

도심에서와 같이 주변 빌딩보다 낮은 높이의 안테나를 가진 낮은 출력의 기지국의 배치는 전파특성의 주변 환경에 대한 의존성을 높인다. 결과적으로 도심에서의 전파는 방향성을 가지며, 이는 기존의 셀룰러 시스템에서 사용된 원형 기지국 반경에 대한 가정이 더 이상 유효하지 않음을 의미한다. 원형 기지국 반경에 대한 가정은 시스템 설계를 보수적으로 하여 더 많은 기지국을 필요로 하게 된다. 이 연구는 비등방형 전파모델에 의한 기지국 배치가 시스템 용량에 끼치는 영향을 조사한다. 직교형 거리를 가진 지형에서 안테나 높이가 낮은 기지국에 대한 측정 데이터에 의한 전파모델이 서술되고 소프트 핸드오프에 대하여 분석이 이루어진다.

Keywords

References

  1. H.-S. Cho; M.Y. Chung, S.H. Kang, and D.K. Sung; 'Performance analysis of cross- and cigar-shaped urban microcells considering user mobility characteristics,' IEEE Trans. Veh. Technol., vol. 49, no. 1, pp. 105-116, Jan 2000 https://doi.org/10.1109/25.820703
  2. C.S. Kang, H.-S. Cho, and D.K. Sung, 'Capacity analysis of spectrally overlaid macro/microcellular CDMA systems supporting multiple types of traffic,' IEEE Trans. Veh. Technol., vol. 52, no. 2, pp. 333-345, March 2003 https://doi.org/10.1109/TVT.2002.807128
  3. B.T. Ahmed, M.C. Ramon, and LH. Ariet, Capacity and interference statistics of Highways W-CDMA Cigar-shaped microcells (Uplink analysis),' IEEE Comm. Letters, vol. 6, no. 5, pp. 172-174, May 2002 https://doi.org/10.1109/4234.1001654
  4. D.H. Kim, D.D. Lee, H.J. Kim, and K.C. Whang, 'Capacity analysis of macro/microcellular CDMA with power ratio control and tilted antenna' IEEE Trans. Veh. Technol., vol. 49, no. 1, pp. 34-42, Jan. 2000 https://doi.org/10.1109/25.820696
  5. K. S. Gilhousen et al., 'On the Capacity of a Cellular CDMA Systems,' IEEE Trans. Veh. Technol., vol. 40, no. 2, pp. 303-312, May 1991 https://doi.org/10.1109/25.289411
  6. A. J. Viterbi, CDMA Principles of Spread Spectrum Communication, Addison Wesley 1995
  7. A. J. Viterbi et al., 'Soft Handoff Extends CDMA Cell Coverage and Increases Reverse Link Capacity,' IEEE J. Sel. Areas Comm., Vol. 12, No. 8,pp1281-1288 Oct., 1994 https://doi.org/10.1109/49.329346
  8. A. M. Viterbi and A. J. Viterbi, 'Erlang Capacity of a Power Controlled CDMA System,' IEEE J. Sel. Areas Comm., Vol. 11, No. 6, pp.892-899, August 1993 https://doi.org/10.1109/49.232298
  9. M. Chopra, K. Rohani and J. R. Reed, 'Analysis ofCDMA Range Extension due to Soft Handoff,' 45th VTC, Chicago, IL, pp.917-921, July 1995
  10. D. Har ,H. L. Bertoni, and S. Kim 'Effect of Propagation Modeling on LOS Microcellular System Design' IJWIN, Vol.4, No.2, pp. 113-123, 1997
  11. H. H. Xia, H. L. Bertoni, L. R. Maciel, A. L. Stewart and R. Rowe, 'Radio Propagation Characteris for LOS Microcellular Mobile and Personal Communications', IEEE Trans. Antennas and Propagations, Vol. 4, NO. 10, Oct. 1993
  12. H. L. Bertoni, W. Honcharenko, L. R. Maciel and H. H. Xia, 'UHF Propagation Prediction for Wireless Personal Communications' Proc. IEEE, vol. 82, pp. 1333-1359, 1994
  13. D. Har, H. H. Xia, and H.L. Bertoni, 'Path-loss prediction model for microcells,' IEEE Trans. Veh. Technol., vol.48, no. 5, pp. 1453-1462, Sept. 1999 https://doi.org/10.1109/25.790520
  14. D. Har, 'Effect of Propagation Modeling on Microcellular System Design', Ph.D. Dissertation, Polytechnic University, May, 1997
  15. D. Har and H.L. Bertoni, 'Effect of anisortropic propagation modeling on microcellular system design,' IEEE Trans. Veh. Techonl., vol. 49, no. 3, pp. 1303-1313, May 2000 https://doi.org/10.1109/25.875247