Abstract
In visible light communication (VLC) systems, white light emitting
diodes (LEDs) are used as illumination sources and transmitters
simultaneously. Compared to the phosphor-converted LEDs, multi-chip LEDs
have higher modulation bandwidth. Consequently, the multi-chip based VLC
systems have great potential for high data rate transmission. Since each
chip of the multi-chip LEDs can be modulated independently, parallel
communication channels are viable for information transmission. In this
paper, in order to maximize the multi-user sum-rate for the multi-chip
based multi-input single-output VLC systems, an electrical and optical
power allocation scheme is proposed in consideration of the luminance,
chromaticity, amplitude and bit error rate constraints. From the
perspective of human color vision, the chromaticity constraint is defined
within a MacAdam ellipse. As a result, the degree of freedom can be
achieved by relaxing the chromaticity constraint from a fixed color point
to an elliptic region. Numerical results demonstrate that with the
increase of the total luminous flux, the maximum sum-rates present an
open-down parabolic tendency due to the limited dynamic range of LEDs.
Higher data rate can be achieved under higher correlated color temperature
(CCT) for the variation of light components. In addition, the simulation
results indicate that the shapes of the chromaticity constrained region
(either ellipse or quadrangle) have little impact on the multi-user
sum-rate at the same CCT.
© 2016 IEEE
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