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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Adjacent Interference Analysis between M-WiMAX OFDMA/TDD and WCDMA FDD System in the 2.6 GHz Band Part I : Adjacent Interference Analysis in SISO System

2.6 GHz 대역에서 M-WiMAX OFDMA/TDD 시스템과 WCDMA FDD 시스템간의 상호 간섭 분석 Part I : SISO 시스템에서의 상호 간섭 분석

  • 고상준 (인하대학교 정보통신대학원 이동통신연구실) ;
  • 왕우붕 (인하대학교 정보통신대학원 이동통신연구실) ;
  • 장경희 (인하대학교 정보통신대학원 이동통신연구실)
  • Published : 2007.06.30
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Abstract

In this paper, we analyze the adjacent interference between WCDMA and M-WiMAX systems in the 2.6GHz Band under the SISO (Single Input Single Output) configuration. The interference scenarios are characterized into 8 scenarios with different victim and interfering links. Among the 8 scenarios, we find that the most performance loss is observed in the scenarios of victim uplink suffering interference from downlink in both systems. Besides, guard band is applied to mitigate the adjacent interference in all the scenarios. Especially, we reveal that M-WiMAX system is much more sensitive to adjacent interference than WCDMA system due to the lower transmission power. In this paper, we consider the worst interference environment, where interferers always transmit with the maximum power, a loose spectrum mask is adapted, and no additional channel fitters are equipped in both systems.

본 논문에서는 2.6 GHz 대역에서 WCDMA (Wideband Code Division Multiple Access) 시스템과 M-WiMAX (Mobile-Worldwide Interoperability for Microwave Access) 시스템 모두 SISO (Single Input Single Output) 만을 적용한 상태에서, 상호 시스템 간에 미치는 간섭의 영향을 분석한다. 간섭이 발생하는 경우는 각 시스템 별로 네 가지로써, 총 여덟 가지의 경우가 존재한다. 그 중에서도 간섭원의 하향링크가 피간섭원의 상향링크에 미치는 간섭의 크기가 가장 심각한 경우임을 밝히며, 간섭의 영향을 최소화하기 위해 여덟 가지 경우 모두에 5MHz 의 보호대역을 적용한다. 특히 M-WiMAX 시스템이 피간섭원인 경우가 WCDMA 시스템이 피간섭원인 경우에 비해 더 많은 간섭이 발생하며, 이는 두 시스템간의 최대 송신 전력의 차이가 주된 원인으로 작용한다. 본 논문에서는 실질적인 상황과는 다르게 Spectrum Mask 내에 간섭원에 해당되는 시스템의 송신전력이 가득 채워져 있는 경우로 가정하였기 때문에, 보다 엄격한 Emission Mask를 사용하고 실질적인 시스템 간 간섭분석의 Worst-case 결과로 볼 수 있다.

Keywords

References

  1. ITU WiMAX Forum WP8F-1-E, Aug. 2006
  2. ITU WiMAX Forum WP8F-2-E, Aug. 2006
  3. 3GPP, 'Base Station (BS) Radio Transmission and Reception (FDD)', 3GPP TS 25.104 Version 7.4.0, June 2006
  4. 3GPP, 'User Equipment (UE) Radio Transmission and Reception (FDD)', 3GPP TS 25.101 Version 7.4.0, June 2006
  5. ITU Spectrum SWG Sharing Studies WP8F 391-E, May 2006
  6. Report & Order & Further Notice of proposed Rulemaking, FCC-04-135 A1, July 2004
  7. Report ITU-R M.2039, 'Characteristics of terrestrial IMT-2000 systems for frequency sharing/interference analyses', Report ITU-R M.2039, Jan. 2004
  8. Report ITU-R M.2030, 'Coexistence between IMT-2000 time division duplex and frequency division duplex terrestrial radio interface technologies around 2MHz operating in adjacent bands and in the same geographical area.', Jan. 2003
  9. ITU-R SM.1541, 'Unwanted emission in the out-of-band domain', Jan. 2002
  10. ERC Report 101 A comparison of the Minimum Coupling Loss Method, Enhanced Minimum Coupling Loss Method and the Monte-Carlo Simulation, May 1999
  11. 3GPP R1-030042, Update of OFDM SI Simulation Methodology, Jan. 2003
  12. 802.20 Evaluation Criteria, Ver.1.0, Sept. 2005
  13. cdma2000 Evaluation Methodology, Revision 0, Dec. 2004
  14. CDG Evolution Study Report, Revision 4.00, Dec. 1999
  15. 3GPP2 TSG-C.R1002, 1xEV-DV Evaluation Methodology, Ver.13.1, July 2001
  16. Recommendation ITU-R M.1225 Guidelines for Evaluation of Radio Transmission Technologies for IMT-2000, 1997
  17. I.S. Cha, S.H. Park, and K.H. Chang, 'Cell radius & guard band requirements by mutual interference investigation between satellite digital multimedia broadcasting systems using gap-filler,' in Proc. IEEE Veh. Tech. Conf. – Spring, May. 2005, pp. 522-526