基于MIMO技术的LED可见光通信系统  

LED visible light communication systems based on MIMO technology

作　　者：秦岭 张玉鹊 李宝山[1] 杜永兴[1] QIN Ling;ZHANG Yuque;LI Baoshan;DU Yongxing(School of Information Engineering, Inner Mongolia University of Science and Technology, Baotou 041010, China)

机构地区：[1]内蒙古科技大学信息工程学院

出　　处：《激光技术》2019年第4期539-545,共7页Laser Technology

基　　金：国家自然科学基金资助项目(61501266;61661044);内蒙古科技大学创新基金资助项目(2017YQL10)

摘　　要：为了改善室外发光二极管(LED)可见光通信系统的性能,解决湍流效应引起的光束相位变化、光束漂移、光束扩展等干扰问题,提出了一种基于多输入多输出(MIMO)技术的LED可见光通信系统.首先构建了大气湍流信道模型,然后利用MIMO技术相关原理搭建了LED可见光通信系统模型,最后采用最大比合并的方法恢复出原始的信号,并计算误比特率.结果表明,在相同的湍流强度下,随着系统分集程度越大,误比特率越低;在强湍流信道环境下,M=3,N=4的通信系统实现了10-7的误比特率,与M=1,N=1的通信系统相比,误比特率降低了5个数量级.该研究验证了MIMO技术抑制湍流效应的可行性与有效性.In order to improve the performance of an outdoor light emitting diode(LED) visible light communication system and solve the interference problems caused by turbulence, such as phase change, beam drift and beam spread, etc., a LED visible light communication system based on multiple-input multiple-output(MIMO) technology was proposed. Firstly, the atmospheric turbulence channel model was constructed. Secondly, the model of LED visible light communication system was built based on MIMO technology. Finally, the original signal was recovered by maximum ratio merging method and bit error rate was calculated. The results show that, at the same turbulence intensity, the greater the diversity of the system, the lower the bit error rate. In the strong turbulent channel environment, the M=3, N=4 communication system achieves a bit error rate of 10-7. Compared with the M=1, N=1 communication system, the bit error rate is reduced by five orders of magnitude. This study verifies the feasibility and effectiveness of MIMO technology in suppressing turbulence effect.

关 键 词：光通信 大气湍流 多输入多输出技术 误比特率 

分 类 号：TN929.1[电子电信—通信与信息系统]