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The system is robust, but non suitable to implement complex network stack. Indeed basic modulation coding schemes are used, such as the Manchester code and the Miller code. Both the codes use OOK (On-Off Keying) amplitude modulation which is simple and well suited for data transmissions at frequencies of tens of kilohertz. The experimental tests have been conducted with a traffic light (red and green lights) installed in the corridor of the laboratory or outdoor. Basically, the message transmitted during the experiments is sent to the emitter and the frame indicates if Miller or Manchester code is selected.

The VLC receiver is an optoelectronic transducer (PIN photodiode or avalanche photodiode or CMOS sensor) that receives information, previously modulated in the visible light spectrum, and converts it into electrical signals than can be processed by a demodulator/decoder. Three types of topologies are possible for the VLC link: directed Line-of-Sight (LOS), non-directed LOS, diffused non-LOS. As depicted in Fig. 3, the directed LOS allows the highest intensity for the received signal and thus it has the highest bitrate and the longest distance are achieved at the expense of severe demand of precise alignment; in the non-directed LOS the receiver has a wider field of view, the alignment is simpler, but the intensity of the signal is at medium level, so shorter RX TX DATA ENCODER / MODULATOR LED PIN PD APD CMOS Fig.

The packet goes through a digital-to-analog conversion in a SDR and is passed to the VLC frontend, which changes the light intensity of the LED taillight according to the input analog signal. On the receiving end, the photodetector converts the received optical signal to an electric signal, which goes through an analog-to-digital conversion in SDR. The laptop then performs the demodulation and decode processes to obtain the scooter information in the original packet. Finally, the information is sent to a smartphone mounted on the handlebar of the scooter.

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Autocar [UK] (16 July 2014)

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