On the SIR of a cellular infrared optical wireless system for an aircraft

  • Authors:

  • Svilen Dimitrov;Raed Mesleh;Harald Haas;Mario Cappitelli;Michael Olbert;Erhard Bassow

  • Affiliations:

  • Jacobs University, Department of Electrical Engineering and Science, Bremen, Germany;Jacobs University, Department of Electrical Engineering and Science, Bremen, Germany;University of Edinburgh, Institute for Digital Communications, Edinburgh, UK;EADS Germany, Hamburg, Germany;EADS Germany, Hamburg, Germany;Airbus Germany, Hamburg, Germany

  • Venue:
  • IEEE Journal on Selected Areas in Communications - Special issue on optical wireless communications
  • Year:
  • 2009

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Abstract

In this paper, first, path loss models are developed for infrared optical wireless transmission inside an aircraft cabin. Second, a cellular network in the aircraft is considered and signal-to-interference ratio (SIR) maps are determined via simulation. For this purpose, a Monte Carlo ray-tracing (MCRT) simulation is performed in a geometric computer-aided design (CAD) cabin model with defined position, azimuth (AZ), elevation (EL) and field of view (FOV) properties of transmitters and receivers. Mathematical models are developed for line-of-sight (LOS) and non-line-of-sight (NLOS) path losses along particular paths, including estimation of the path loss exponent and the shadowing component. The shadowing is modeled according to a log-normal distribution with zero mean and standard deviation σ. The validity of this model is confirmed in the paper. It is shown that irradiance distribution under LOS conditions experiences an attenuation with a path loss exponent of 1.92 and a shadowing standard deviation of 0.81dB. In NLOS conditions, however, the path loss exponent varies, depending on the nature of the NLOS cases considered. The presented NLOS scenarios yield path loss exponent values of 2.26 and 1.28, and shadowing standard deviation values of 1.27dB and 0.7dB, respectively. Finally, the cabin is divided into cells and SIR maps are presented for different frequency reuse factors. It is shown that at the edges of the circular cells with diameter of 2.8m, a SIR of -5.5dB is achieved in a horizontal cross section of the cabin for frequency reuse of 1, and -2dB and 3dB for frequency reuse factors of 2 and 3, respectively. This means that in an aircraft cabin, for reuse factors less than three, viable communication at the cell edges is not feasible without additional interference avoidance or interference mitigation techniques.