DOI QR코드

DOI QR Code

A Photon Modeling Method for Characterization of Indoor Optical Wireless System

실내 광 무선 통신 특성 해석을 위한 포톤 모델링 방법

  • Published : 2008.06.30

Abstract

In this paper, an analysis method for indoor optical wireless channel properties based on photon model is presented for characterization of communication environment. In contrast to radio waves, optical waves have very short wave-lengths and very high frequencies, so that material properties become important. Channel models including diffuse reflections and absorption effects due to material surface textures make conventional electromagnetic wave analysis methods based on ray tracing consume enormous time. To overcome these problems, an analysis method using photon model is presented that approximates light intensity by a density of photons. The photon model ensures that simulation time is within a predictable limit.

본 논문에서는 실내 환경에서 가시 광선을 이용한 무선 망 설계에 필요한 가시광의 특성 예측을 위해 포톤 모델을 이용하는 방법을 제시한다. 광선을 이용하는 경우, 높은 주파수와 짧은 파장을 갖고 있으므로 광선 추적법을 이용하는 것이 일반적이나, 환경이 복잡하고 복수의 반사, 투과뿐만 아니라 물체 표면의 거친 정도 등의 재질을 고려한 난반사까지 고려해야 하는 경우, 매우 많은 시간이 걸리는 단점이 있다. 이러한 단점을 해결하기 위해 본 논문에서는 광선 추적법을 보완하여 광선의 세기를 포톤의 밀도로 근사하여 계산 정밀도와 계산 시간을 타협하는 방식을 제시한다.

Keywords

References

  1. Joseph M. Kahn et al., "Non-directed infrared links for high-capacity wireless LANs", IEEE Personal Communications, no. 2, 1994
  2. Joseph M. Kahn, William J. Krause, and Jeffrey B. Carruthers, "Experimental characterization of non- directed indoor infrared channels", IEEE Trans. on Communications, vol. 43, no. 2, pp. 1613-1623, Feb. 1995 https://doi.org/10.1109/26.380210
  3. Francisco J. Lopez-Hernandez, Rafael Perez-Jimenez, and Asuncion Santamaria, "Ray tracing algorithms for fast calculation of the channel impulse response on diffuse IR wireless indoor channels", Optical Engineering, vol. 39, no. 10, pp. 2775-2780, Oct. 2000 https://doi.org/10.1117/1.1287397
  4. H. W. Jensen, "Global illumination using photon maps", Eurographics, vol. 7, pp. 21-30, 1996
  5. Matthew N. Sadiku, Numerical Techniques in Electromagnetics, CRC Press, pp. 538-541, 2001
  6. C. Schlick, "An inexpensive BRDF model for physically-based rendering", Eurographics, vol. 13, no. 3, pp. 234-246, 1994
  7. J. R. Barry, J. M. Kahn, W. J. Krause, E. A. Lee and D. G. Messerschmitt, "Simulation of multipath impulse response for indoor wireless optical channels", IEEE Journal on Selected Areas in Communications, vol. 11, no. 3, pp. 367-379, Apr. 1993 https://doi.org/10.1109/49.219552