In this article, a tool for simulating the channel impulse response for indoor visible light communications using 3D\r\ncomputer-aided design (CAD) models is presented. The simulation tool is based on a previous Monte Carlo\r\nray-tracing algorithm for indoor infrared channel estimation, but including wavelength response evaluation. The 3D\r\nscene, or the simulation environment, can be defined using any CAD software in which the user specifies, in\r\naddition to the setting geometry, the reflection characteristics of the surface materials as well as the structures of\r\nthe emitters and receivers involved in the simulation. Also, in an effort to improve the computational efficiency, two\r\noptimizations are proposed. The first one consists of dividing the setting into cubic regions of equal size, which\r\noffers a calculation improvement of approximately 50% compared to not dividing the 3D scene into sub-regions.\r\nThe second one involves the parallelization of the simulation algorithm, which provides a computational speed-up\r\nproportional to the number of processors used.
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