Visible Light Communication (VLC), which is a recent technology that operates at the visible light spectrum band, is a very propitious technology complementary to RF in the era of spectrum crisis. Because of the extensive deployment of energy efficient Light Emitting Diodes (LEDs) and the advancements in LED technology with fast nanosecond switching times, VLC has gained a lot of interest recently. In this paper, we consider a downlink VLC architecture which is capable of providing simultaneous lighting and communication coverage across an indoor setting. We design a multi-element hemispherical bulb which transmits multiple data streams from its LEDs to mobile receivers. The architecture employs a Line-of-Sight (LOS) alignment protocol to tackle the hand-off issue caused by the mobility of the receivers in the room. We formulate an optimization problem that jointly addresses the LED-user associations as well as the LEDs’ transmit powers in order to maximize the Signal-to-Interference plus Noise Ratio (SINR) while taking into consideration an acceptable illumination uniformity constraint across the room. We propose a near-optimal solution using Geometric Programming (GP) to solve the optimization problem, and compare the performance of this GP solution to low complexity heuristics.

中文翻译：

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多 LED 多数据流 VLC 网络中 SINR 和照明均匀性的优化

可见光通信 (VLC) 是一项在可见光频段运行的最新技术，是频谱危机时代对 RF 进行补充的一项非常有利的技术。由于节能发光二极管 (LED) 的广泛部署以及具有快速纳秒切换时间的 LED 技术的进步，VLC 最近引起了很多兴趣。在本文中，我们考虑了一种下行链路 VLC 架构，该架构能够在室内环境中同时提供照明和通信覆盖。我们设计了一种多元素半球灯泡，可将多个数据流从 LED 传输到移动接收器。该架构采用视线 (LOS) 对齐协议来解决由房间内接收器移动引起的切换问题。我们制定了一个优化问题，共同解决 LED 用户关联以及 LED 的发射功率，以最大化信号干扰加噪声比 (SINR)，同时考虑到整个房间可接受的照明均匀性约束。我们提出了一种使用几何规划 (GP) 的近乎最优的解决方案来解决优化问题，并将该 GP 解决方案的性能与低复杂度启发式算法的性能进行比较。