室内可见光MIMO信道的空间相关性分析

该文针对室内可见光多输入多输出(MIMO)信道的空间相关性展开研究，基于朗伯辐射模型，建立了室内可见光MIMO信道模型；并基于该模型，分析了发送与接收空间相关性与空间距离参数的关系，给出了发送与接收相关系数的表达式，为室内可见光MIMO通信系统的布设提供了理论指导；信道矩阵条件数仿真验证了信道空间相关性随发光二极管(LED)间距的减小而增大、随光电检测器(PD)间距的减小而增大、随LED到PD垂直距离的增大而增大；信道容量仿真得出，随着LED与PD数量的增加，信道容量逐步提高，但随着信道空间相关性的增强，信道容量的提高逐步减小。

Spatial Correlation Analysis of MIMO Channel in Indoor Visible Light Communication

This paper addresses the spatial correlation of MIMO channel with application to indoor Visible Light Communication (VLC). This study establishes a model for indoor VLC MIMO channel based on the Lambert radiation model, and then analyzes the effect on the spatial correlation of both transmit and receive channel by different distance parameters in this model. Thus, the mathematical expressions of the spatial correlation coefficients of both transmit and receive channel are derived, which can provide a theoretical guide to the layout of the indoor VLC MIMO system. The simulation results regarding the channel matrix condition verify that the channel spatial correlation becomes stronger with the decreasing of Light Emitting Diode (LED) spacing, PhotoDetector (PD) spacing, and the increasing of the vertical distance from LED to PD. In addition, the channel capacity simulation results show that the channel capacity can be enhanced by increasing the number of LED and PD, whereas the channel capacity gain can be reduced with stronger channel spatial correlation.