M ay 2 01 5 Indoor Positioning in High Speed OFDM Visible Light Communications

Visible Light Communication (VLC) technology using light emitting diodes (LEDs) has been gaining increasin g attention in recent years as it is appealing for a wide range o f applications such as indoor positioning. Orthogonal frequency division multiplexing (OFDM) has been applied to indoor wireless optical communications in order to mitigate the effectof multipath distortion of the optical channel as well as increasing data rate. In this paper, we investigate the indoor positioning accuracy of optical based OFDM techniques used in VLC systems. A positioning algorithm based on power attenuatio n is used to estimate the receiver coordinates. We further cal culate the positioning errors in all the locations of a room and compare them with those using single carrier modulation scheme, i.e, on-off keying (OOK) modulation. We demonstrate that OFDM positioning system outperforms its conventional counterp art.

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