Abstract
“Green” and energy-efficient wireless communication schemes have recently experienced rapid development and garnered much interest. One such scheme is visible light communication (VLC) which is being touted as one of the next generation wireless communication systems. VLC allows communication using multi-color channels that provide high data rates and illumination simultaneously. Even though VLC has many advantageous features compared with RF technologies, including visibility, ubiquitousness, high speed, high security, harmlessness for the human body and freedom of RF interference, it suffers from some problems on the receiver side, one of them being photo sensitivity dissimilarity of the receiver. The photo sensitivity characteristics of a VLC receiver such as Si photo-detector depend on the wavelength variation. The performance of the VLC receiver is not uniform towards all channel colors, but it is desirable for receivers to have the same performance on each color channel. In this paper, we propose a mitigation technique for reducing the performance variation of the receiver on multi-color channels. We show received power, SNR, BER, output current, and outage probability in our simulation for different color channels. Simulation results show that, the proposed scheme can reduce the performance variation of the VLC receiver on multi-color channels.
Highlights
Nowadays Light Emitting Diodes (LEDs) are considered to represent the generation lighting and communication devices
Among the many applications using colored light sources that can be considered in visible light communication (VLC) are: (i) the scenario in which a VLC receiver receives some information from traffic signal light sources with color “A” and color “B”
For a low cost visible light communication system, the most viable modulation is the intensity modulation (IM), in which the desired waveform is modulated onto the instantaneous power of the carrier
Summary
Nowadays Light Emitting Diodes (LEDs) are considered to represent the generation lighting and communication devices. Among the many applications using colored light sources that can be considered in VLC are: (i) the scenario in which a VLC receiver receives some information from traffic signal light sources with color “A” and color “B”. A typical VLC receiver may display high receiver performance only on, for example, the color “A” channel but it doesn’t show the same performance on the color “B” or color “C” channels [2]. One of the main factors, the dependency of the photo sensitivity of a photo-detector on wavelength, needs to be considered in order to ensure that the performance of a VLC receiver can be maintained uniformly on multi-color channels. We propose a receiver structure in order to reduce the problem of performance variation according to the multi-color channels and maintain the receiver output current uniform as much as possible for all color of channels.
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