Abstract
For requiring high communication rate and high-quality illumination, multi-color light-emitting diodes (LEDs) have been utilized in visible light communication (VLC) systems and attracted substantial research interests. It should be noted that multiple colors are not independent from each other since they are jointly limited by the chromaticity constraint. Thus, taking full consideration of the multi-color crosstalk problem and actual communication and illumination constraints, this paper formulates a power-efficient illumination control optimization design to reduce power consumption for the quadrichromatic LED (QLED) based VLC systems where signal to interference plus noise ratio (SINR) and quadrangle chromaticity tolerance region constraints should be satisfied. Simulation results illustrate that our proposed optimal power allocation strategy can significantly increase power efficiency for the VLC system compared with the uniform power allocation method. Moreover, the proposed scheme can provide optimal performance under different given correlated color temperature (CCT) values.
Highlights
As an emerging short-range wireless communication technology, visible light communication (VLC) can be regarded as a potential solution for providing data transmission and the inherent lighting simultaneously, which attracts tremendous attention worldwide [1,2,3]
(QLED) with red/amber/green/blue (RAGB) colors has been recommended as an alternative to the red/green/blue light-emitting diodes (LEDs) (RGB-LED) to improve the color quality where proper color temperature can be provided for indoor lighting [8]
We have carried out the simulations for the multi-color LED based VLC system to testify the performance of our proposed power-efficient illumination control optimization design
Summary
As an emerging short-range wireless communication technology, visible light communication (VLC) can be regarded as a potential solution for providing data transmission and the inherent lighting simultaneously, which attracts tremendous attention worldwide [1,2,3]. The pc-LEDs are low cost and accessible, and they occupy a large part of the market Their intrinsic modulation bandwidth is limited to MHz. As for the multi-color LEDs, the white light illumination can be achieved by mixing the multiple monochromatic lights together. As for the multi-color LEDs, the white light illumination can be achieved by mixing the multiple monochromatic lights together They are more expensive and complex, their higher modulation bandwidth and natural multi-channel properties show quite large potential of high-rate data transmission. Via wavelength-division multiplexing (WDM) technique, the multi-color LED based VLC system naturally forms a color-domain multiple input and multiple output (CMIMO) channels for multiple parallel data transmission, which can provide potential high transmission rate and high-quality illumination [6,7]. It should be noted that quadrichromatic LED (QLED) with red/amber/green/blue (RAGB) colors has been recommended as an alternative to the red/green/blue LED (RGB-LED) to improve the color quality where proper color temperature can be provided for indoor lighting [8]
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