Transmitter distribution for MIMO visible light communication systems

In the future, buildings will be lit using solid state lighting, particularly white light emitting diodes (LEDs). Solid state lighting is a rapidly expanding area of research due to the reliability of LEDs and the numerous applications possible including Visible Light Communications (VLC), where a white LED is used to illuminate a room at the same time as providing a data communications system. VLC systems are restricted by limited modulation bandwidths of typically only a few MHz. This can be overcome however, since multiple arrays of LEDs are manipulated, allowing a multiple-input multiple-output (MIMO) technique which simultaneously illuminates the room uniformly and provides parallel data transfer. In this paper, a non-imaging MIMO technique is employed, with results showing that the system does not perform consistently at all receiver positions, owing to symmetry. The simulations performed show that aggregate speeds up to 12Mbps can be achieved using this transmitter distribution. Keywords-LED; Optical wireless communications; Visible light communications;Optical MIMO; Non-Imgaing.