Flicker-Free and Error Correction Coding for On-Off Keying Visible Light Communication

• Main Authors: Wei-Han Cheng, 程威翰
• Other Authors: 黃鼎偉
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/71539628730332214601

碩士 === 國立臺灣大學 === 光電工程學研究所 === 103 === White Light Emitting Diodes (LEDs) have attracted lots of attention because of their characteristics of low power consumption, high efficiency and long lifetime, and hence visible light communication (VLC) has become a new technology development. VLC means we can use LEDs not only as an illuminating device but also for data transmission. This property will decrease power consumption, and also in certain circumstances it has advantages compared to conventional illuminating devices. When LEDs are used both for illumination and data transmission, the issue of whether light intensity depends on the data being transmitted becomes very important. Therefore, in this thesis an algorithm is provided to eliminate the flicker situation while transmitting data. Also, a coding method is proposed which not only can eliminate the flicker but also has the ability of correcting the error bit. This thesis is divided into five chapters. Chapter 1 gives the motivation and contribution of this research. Chapter 2 introduces the LED illumination theory, VLC system, and sensitivity of the human visual system. Chapter 3 provides the detail of MBNB and MBNB with error correction algorithm, simulation system, results and discussion. In chapter 4, the implementation of the VLC system is demonstrated to verify the simulation results. Chapter 5 gives the conclusions and recommendations for future work.