摘要
为了解决可见光通信系统同时满足照明和通信的需求,设计了一种四色可见光通信系统的优化方案.该方案将原始信号经过预编码并加入直流偏置,将色温和显色指数约束转化为混光比例的约束,然后引入半定松弛算法对均方误差(MSE)的最小值进行优化求解.数值分析结果表明,引入黄光可以有效地提升白光LED的显色指数,改善LED光源的光学特性;增加光照强度或降低数据流数,优化后的系统信道串扰和MMSE明显减小.因此,改方案既提高了传输速率,也兼顾室内照明,具有很好的应用价值.
We have designed a joint optimization scheme of pre-coding and driving current for a four-color visible light communication system to solve the problem that the visible light communication system satisfies both lighting and communication.In this scheme,the original signal is pre-encoded and added to the DC bias.The color temperature and color rendering index constraints are converted into the light mixing ratio constraints.Then the minimum mean square error(MSE)is optimized by introducing the semi-definite relaxation algorithm.Numerical analysis shows that the introduction of yellow light can effectively improve the color-rendering index of white LED and improve the optical characteristics of LED light source.The increase of light intensity or the decrease of data flow,the optimized system crosstalk and MMSE decrease obviously.Therefore,the program to improve both the transfer rate,but also take into account the indoor lighting,has good application value.
作者
张永棠
ZHANG Yong-tang(Department of Computer Science and Technology,Guangdong Neusoft Institute,Foshan 528225,China;Institute of Cooperative Sensing and Advanced Computing Technology,Nanchang Technology Institute,Nanchang 330003,China)
出处
《嘉应学院学报》
2018年第5期13-16,共4页
Journal of Jiaying University
基金
国家自然科学基金(61363047)
佛山市科技创新项目(2016AG100792)
关键词
可见光通信
最小均方误差
预编码
显色指数
四色传输
visible light communication
minimum mean square error
precoding
color rendering index
four-color transmission
