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The performance of non-line-of-sight indoor wireless infrared communication systems depends on the re ection characteristics of the surfaces that surround the communication space. This paper presents a set of measured re ection patterns of the most common indoor surfaces and the approximation of those experimental patterns using two re ection models: the model of Lambert and the model of Phong. The results show that the re ection pattern of many surfaces present a strong specular component. Those patterns are well approximated by the model of Phong, but not by the model of Lambert. It is also shown that the use of the model of Lambert to approximate the re ection pattern of specular surfaces can lead to errors of several dBs in the evaluation of the propagation losses.

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