可见光通信灯具的失效机理耦合作用研究

The LED-based Visible Light Communication (VLC) technology develops rapidly and has broad application prospects. Reliability is considered as one of bottle-neck of VLC development. However, there are few studies focus on failure mechanism of LED-based VLC lamps. The interaction among different failures and degradations is one of significant research topics of VLC system reliability. This project studies the interactions among various different failure or degradation mechanisms of LED-based VLC lamps. By combining physics of failure theories and stochastic processes, a probabilistic physics of failure-based simulation method for VLC lamp will be developed. A testing platform will be set up to carry out tests for LEDs, MOSFET and VLC lamps for extraction of key parameters, verifying the pre-developed simulation method. Via experiment-based and simulation-based design of orthogonal experiments, this project will study failure and degradation mechanism of VLC lamps, analyze the interactions among failure and degradation mechanism quantitatively, and propose the interaction model of major failure/ degradation mechanism. Achievement of this project will improve the reliability theory of VLC technology, provide theoretical support for design for reliability (DfR) of LED-based VLC lamps. Relevant industries have urgent needs for this research.

基于LED的可见光通信技术发展迅速、前景广阔。可靠性问题是制约可见光通信技术发展的瓶颈之一，而可见光通信灯具的失效机理研究尚属空白。不同失效/退化机理的耦合作用是其中的重要课题。本项目以基于LED可见光通信灯具为对象，研究不同失效/退化机理的耦合作用。通过结合失效物理与随机过程理论，发展基于失效统计物理的可见光通信灯具仿真方法；搭建可见光通信灯具实验平台，开展不同条件下光源、MOSFET及灯具的实验，验证仿真方法、提取关键参数；根据统计理论设计正交实验(DOE)，开展基于实验和仿真的DOE，研究灯具的失效和退化，定量分析不同失效/退化机理的交互作用，提出主要失效/退化机理的耦合作用模型。本课题的研究，将进一步丰富和完善可见光通信的可靠性分析理论，为提高可见光通信灯具的寿命与可靠性提供理论支撑，在实践中有助于提升产品竞争力，相关产业对该研究具有迫切需求。

项目对可见光通信技术及其系统可靠性进行了文献调研。通过阅读分析大量文献，跟踪了可见光通信技术的研究前沿。针对可见光通信系统的关键器件，开展了基于符号序列的可靠性仿真建模。通过符号序列将物理模型和统计模型结合，分析了可见光通信系统中多种失效模式共存时的耦合作用。在此基础上进行了小信号模型的建模，分析了LED阵列的可靠性。同时，项目购置或升级了实验设备，搭建了基于嵌入式系统可见光通信灯具实验平台和光源老化系统，分别开展了LED光源、MOSFET及灯具老化试验。针对实验过程中出现的环境光干扰严重问题，提出了基于神经元电路的信号接收方法，研究了该接收端的可靠性。