Multiuser MIMO Indoor Visible Light Communication System Using Spatial Multiplexing
Multiuser MIMO Indoor Visible Light Communication System Using Spatial Multiplexing
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DOI：
10.1109/jlt.2017.2765462
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发表时间：
2017-12-01
影响因子：
4.7
通讯作者：
Brandt-Pearce, Maite
中科院分区：
文献类型：
--
作者：
Lian, Jie;Brandt-Pearce, Maite
可见光通信是室内无线接入的一种节能且经济的解决方案。在本文中，我们提出了一个多输入多输出系统，使用集中式或分散式发射功率分配算法与多个LED和光电探测器。该系统采用光码分多址技术来支持多个用户。在接收机处设计了时空最小均方误差滤波器，以减小多址干扰的影响。在集中式功率分配算法中，房间内的所有LED灯由中央控制器协调和控制;每个LED灯支持室内区域内的所有用户。我们所提出的分散式功率分配演算法，与集中式演算法相比，具有相似的误比特率效能，但计算量却较少。在我们的分散算法中，用户由LED的子集支持，因此优化问题的大小可以减少多达93%。对于每个接收器，采用具有不同取向的多个光电探测器来提高信号与干扰加噪声比。此外，一些实际的考虑，如阴影效应，照明要求，调光控制，和发射功率量化考虑。
Visible light communications is an energy efficient and cost-effective solution for indoor wireless access. In this paper, we propose a multiple input multiple output system using centralized or decentralized transmitted power allocation algorithms with multiple LEDs and photodetectors. The proposed system uses an optical code division multiple-access technique to support multiple users. Time-space minimum mean squared error filters at the receivers are designed to diminish the effect of multiple-access interference. In the centralized power allocation algorithm, all the LED lamps in the room are coordinated and controlled by a central controller; each LED lamp supports all the users within the indoor area. The decentralized power allocation algorithms we propose have similar bit error rate performance yet less computational burden compared to the centralized algorithm. In our decentralized algorithms, users are supported by a subset of the LEDs, and so the optimization problem size can be reduced by as much as 93%. For each receiver, multiple photodetectors with different orientations are employed to improve the signal to interference plus noise ratio. In addition, some practical considerations such as shadowing effects, illumination requirements, dimming control, and transmitted power quantization are taken into account.