中文摘要：

针对多输入多输出（MIMO）的室内可见光通信（VLC）系统,通过改变发光二极管（LED）及光接收机的空间分布,分析了天线布局对于系统性能的影响。VLC系统采用基于朗伯辐射的信道模型,使用常见的重复编码（RC）、空间复用（SMP）和空间调制（SM）3种MIMO技术,分析了两种系统。第1种为4×6系统,即发射端的4个LED采用正方形布局,光接收机的6个探测器采用正六边形、矩形和三角形布局。仿真结果表明,在室内中心处,对于RC,三角形布局的误码率（BER）性能最好;对于SMP和SM,正六边形和三角形的性能相近,且优于矩形布局。在室内非中心处,正六边形是3种技术的最优选择。第2种为8×8系统,LED和光检测器分别采用正八边形、正方形布局。仿真结果表明,发送端采用正方形布局时系统性能较好。

英文摘要：

For multi-input multi-output（MIMO）indoor visible light communication（VLC）,this paper analyzes the impact of antenna layout on the system performance by changing the spatial distribution of light-emitting diodes（LEDs）and optical receivers.In this paper,we use a channel model,which is based on Lambertian radiation,to estimate the channel state matrix.The MIMO technique used in the system consists of three well-known aspects,repetition coding（RC）,spatial multiplexing（SMP）and spatial modulation（SM）.Two types of systems are analyzed in this paper.The first case is a 4×6system,which uses 4LEDs at the transmitter side arranged in square layout and 6detectors at receivers arranged in hexagonal,rectangular and triangular layouts.As shown in the simulation results,the triangular layout gives the best bit error rate（BER）performance for RC at the center of the room.The BERcurves of hexagonal and triangular layouts are almost coincident for SMP and SM,which are both better than the BERcurve of rectangle layout.If the receiver is not at the center of the room,the hexagonal layout is the best choice.The second case is an 8×8system with LEDs and photo detectors using octagonal,square layouts respectively.The simulation results show that the system using square layout in the transmitter has better BERperformance than that using the octagonal layout.