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Indoor Propagation Channel Modeling Using the Finite Difference Time Domain Method

시간영역 유한차분법을 이용한 실내 전파 채널 모델링

  • Received : 2011.08.01
  • Accepted : 2011.08.31
  • Published : 2011.09.30

Abstract

Analysis of an indoor propagation channel has conventionally used the ray-tracing method. But, in this paper, we had modelling the channel for three dimensional indoor structure by the finite difference time domain method for three dimensional full wave analysis. An excitation signal of the FDTD method used plane wave. The plane wave was excited using the total field/scattered field method. And absorbing boundary condition used the perfectly matched layer method with 7 layers. An living room for the simulation of indoor channel modeling is surrounded the wall that be composed of the wood, the conductor, the glass and concrete. When there are furniture in the living room or not, it were simulated, respectively. As simulation results, we could identify the fading effect of multipath at indoor propagation environment, calculated mean excess delay and rms delay spread for the receiver design.

실내 전파 채널 해석은 고전적으로 경로추적법이 많이 이용되었으나, 이 논문에서는 3차원 전파해석법인 시간영역 유한차분법을 이용하여 3차원 실내 구조에 대하여 채널 모델링하였다. 시간영역 유한차분법의 여기신호로는 평면파를 이용했으며, 이 때의 평면파의 구성은 TF/SF법을 사용했다. 그리고 흡수경계조건으로는 7개의 흡수층을 사용한 완전정합층법을 이용했다. 실내 채널 모델링의 시뮬레이션을 위한 거실은 벽돌, 도체, 유리, 콘크리트로 이루어졌다. 거실에 가구가 있는 경우와 없을 때에 대하여 각각 시뮬레이션 하였다. 시뮬레이션 결과로 실내 전파 환경에서의 다중경로에 의한 페이딩 현상을 확인할 수 있었으며, 수신기 설계에 도움이 되는 초과지연 평균과 실효 지연 확산을 계산할 수 있었다.

Keywords

References

  1. Christopher L.Holloway, Michael G.Cotton and Paul McKenna, "A simplified model for calculation the decay rate of the impulse response for an indoor propagation channel", IEEE Wireless Communications Conference, pp.210-214,1997
  2. Christopher L.Holloway, Michael G.Cotton and Paul McKenna,"A model for prediction the power delay profile characteristics inside a room.", IEEE. Trans. vehicular tech., vol.48, pp.1110-1119, July.1999. https://doi.org/10.1109/25.775360
  3. 송재영, 이행선, "실내 전파 특성 계산을 위한 삼각형 모델 기반의 3차원 광선 추적법",한국전자파학회, 제19권, 7호, pp.733-740, 2008.
  4. Yasumitsu Miyazaki and Koichi Takahashi, "Electromagnetic compatibility characteristics of wireless LAN for indoor environment of buildings by FDTD method.",Asia-Pacific CEEM 2000. pp.251-256, Shanghai, China
  5. Wen-Chin Lan, si-Tseng Chou and Hsing-Yi Chen, "Numerical studies of wave propagation through concrete walls using effective material property technique and FDTD method.", IEEE. pp.578-580,1999
  6. Ugur Oguz, Levent Gurel and Orhan Arikan, "An efficient and accurate technique for the incident-wave excitations in the FDTD method.", IEEE Trans.MTT,vol.46,pp.869-882, June. 1998. https://doi.org/10.1109/22.681215
  7. Allen Taflove and Susan C.Hagness, Computational electrodynamics. Artech House, 2000.
  8. Constantine A. Balanis, Advanced engineering electromagnetics, Wie-wiley, 1989.
  9. Theodore S.Rappaport, Wireless communications, Prentice-hall,1996.