预编码室内MIMO可见光通信系统空间相关性分析  

Analysis of spatial correlation of precoding indoor MIMO visible light communication system

作　　者：张颖[1,2] 高悦 柯熙政 Zhang Ying;Gao Yue;Ke Xizheng(School of Automation and Information Engineering,Xi′an University of Technology,Xi′an,Shaanxi 710048,China;Shaanxi Civil-Military Integration Key Laboratory of Intelligence Collaborative Networks,Xi′an,Shannxi 710048,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]陕西省智能协同网络军民共建重点实验室,陕西西安710048

出　　处：《光电工程》2020年第3期13-19,共7页Opto-Electronic Engineering

基　　金：陕西省重点产业创新链工程(2017ZDCXL-GY-06-01);陕西省教育厅自然科学基金(17JK0569);陕西省教育厅科研计划项目(18JK0341);西安市科技创新引导项目(201805030YD8CG14(12))。

摘　　要：为了解决多用户MIMO(MU-MIMO)室内可见光通信中存在用户间干扰问题及对角化(BD)算法所产生的子信道强弱的问题,利用子流选择BD算法,对室内MU-MIMO可见光通信系统的误码率进行优化。建立了MU-MIMO室内可见光通信的信道模型,利用控制变量法并采用不同LED与PD距离的参数,对比了在4×4 MIMO与8×8 MIMO两种不同的室内系统布局方式下的信道空间相关性,分析对比子流选择BD算法及BD算法的系统容量及误码率性能。结果表明,随着空间相关的不断增强,误码率性能下降,子流选择BD算法相对于BD算法可以带来4 dB以上的增益。In order to solve the problem of multi-user interference and the subchannel strength generated by the block diagonalization(BD)algorithm in multi-user MIMO(MU-MIMO)indoor visible light communication,the bit error rate of the indoor MU-MIMO visible light communication system is optimized by using the substream selected BD algorithm.This paper establishes the channel model for MU-MIMO indoor visible light communication and compares the channel spatial correlation between the 4×4 MIMO and 8×8 MIMO in different indoor system layout modes by using the control variable method and taking different parameters of LED and PD distance,the system capacity and bit error rate performance of substream selected BD algorithm and BD algorithm are compared and analyzed.The results show that with the continuous enhancement of spatial correlation,the bit error rate performance decreases,and the substream selected BD algorithm can bring a gain of more than 4 dB compared with BD algorithm.

关 键 词：可见光通信 子流选择 信道相关性 块对角化 

分 类 号：TN929.1[电子电信—通信与信息系统]