Abstract
The directionality of optical signals provides an opportunity for efficient space reuse of optical links in visible light communication (VLC). Space reuse in VLC can enable multiple-access communication from multiple light emitting transmitters. Traditional VLC system design using photo-receptors requires at least one receiving photodetector element for each light emitter, thus constraining VLC to always require a light-emitter to light-receptor element pair. In this paper, we propose, design and evaluate a novel architecture for VLC that can enable multiple-access reception using a photoreceptor receiver that uses only a single photodiode. The novel design includes a liquid-crystal-display (LCD) based shutter system that can be automated to control and enable selective reception of light beams from multiple transmitters. We evaluate the feasibility of multiple access on a single photodiode from two light emitting diode (LED) transmitters and the performance of the communication link using bit-error-rate (BER) and packet-error-rate (PER) metrics. Our experiment and trace based evaluation through proof-of-concept implementation reveals the feasibility of multiple LED reception on a single photodiode. We further evaluate the system in controlled mobile settings to verify the adaptability of the receiver when the LED transmitter changes position.
Highlights
Visible Light Communication (VLC), is an emerging wireless communication technology that operates unregulated in the visible–light band (400–800 THz frequencies or 380–780 nm wavelengths) of the electromagnetic spectrum, and is enabled by light emitting elements such as light emitting diodes (LED) and light receiving elements such as photodiodes (PD)
The receiver selects the pixel status as OPEN/CLOSE based on, first computing the Signal to Noise Ratio (SNR) on each pixel and flagging the pixels which have SNR above an empirical threshold (Table 5) for each switching time selection, and the receiver making a recommendation on which pixels to OPEN/CLOSE based on whether it has detected the ID sequence
We introduced a novel architecture and a protocol to enable multiple access reception on a VLC receiver with only a single photodiode element
Summary
Visible Light Communication (VLC), is an emerging wireless communication technology that operates unregulated in the visible–light band (400–800 THz frequencies or 380–780 nm wavelengths) of the electromagnetic spectrum, and is enabled by light emitting elements such as light emitting diodes (LED) and light receiving elements such as photodiodes (PD). The LOS requirement provides novel opportunities for efficient space and time reuse in VLC where multiple light emitting transmissions could be multiplexed. Traditional VLC [2] that operates using a single non-array photodiode receiver based reception, requires to incorporate specific multiple access mechanisms to enable reception from different light emitters. With time/frequency/code (TDMA/FDMA/CDMA) division access schemes, the nature of photoreceptors to collectively add all the detected photons within its FOV limits makes differentiation of multiple transmissions and from ambient noise very challenging.
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