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An integrated indoor VLC+PLC system for video broadcast and positioning

Visible light communication (VLC) technology can simultaneously support voice, video broadcast, indoor positioning, and other value-added services. In this paper, Light-emitting diodes (LEDs) are used to transmit multiple high definition television programs with the combination of VLC as the access point and power line communication (PLC) as the network backbone to avoid the sophisticated networking issue. The positioning function was also implemented into this integrated VLC+PLC system by generate unique identification label sequences through Manchester coding for each LED, using on-off keying to modulate light to send label beacons, and utilizing photo-diode to receive it. Since the label information of the reference point is associated with each LED's location and stored in the server database using passive positioning as an example, when the target point is within the communication range of a reference point, it will receive the optical signal transmitted by this particular reference point and the target point can be located by the server. The video broadcast service and the indoor label positioning within VLC+PLC system are independent services needing different transmission schemes [1]. In this paper, a novel scheme is proposed to integrate the video broadcast service and indoor label positioning into one LED, which can support these two services at the same time.