  This paper proposes a novel power-efficient light-emitting diode (LED)
placement algorithm for indoor visible light communication (VLC). In the
considered model, the LEDs can be designedly placed for high power efficiency
while satisfying the indoor communication and illumination requirements. This
design problem is formulated as a power minimization problem under both
communication and illumination level constraints. Due to the interactions among
LEDs and the illumination uniformity constraint, the formulated problem is
complex and non-convex. To solve the problem, we first transform the complex
uniformity constraint into a series of linear constraints. Then an iterative
algorithm is proposed to decouple the interactions among LEDs and transforms
the original problem into a series of convex sub-problems. Then, we use
Lagrange dual method to solve the sub-problem and obtain a convergent solution
of the original problem. Simulation results show that the proposed LED
placement algorithm can harvest 22.86% power consumption gain when compared
with the baseline scheme with centrally placed LEDs.
