Design of visible light communication system for maintaining uniform data rate

Jiun Yu Sung, Wan Feng Lin, Yu Fu Wu, Chi Wai Chow, Chien Hung Yeh*


研究成果: Conference contribution同行評審

1 引文 斯高帕斯(Scopus)


Light-emitting diode (LED) is gradually replacing the fluorescent lamp for lighting. Higher modulation bandwidth of LEDs makes the additional application of visible light communication (VLC) possible. Every location of a VLC system should be provided by equal data rate for smooth communication. However, locations away from the LED lamp have less power. These low-power locations have lower signal-to-noise ratio (SNR); and hence lower data rate can be achieved. For achieving high capacity VLC, strategies should be adequately provided to mitigate this problem. Moreover, for some real-time continuous applications, such as video and voice, latency reduction plan should also be considered. In this paper, an orthogonal frequency-division multiplexing access (OFDMA) based system was proposed to solve the above problem. Because we do not use time-division multiplexing access (TDMA) based system, the latency issue can be reduced. The OFDMA based system is also beneficial for large scale operation because the user bandwidth is not reduced by TDM mechanism. Signal-to-noise-plus-interference ratio (SNIR) distribution of the VLC system is designed to ensure uniform and optimal system capacity. Discrete multi-tone (DMT) is used for this VLC system. The DMT subcarriers are bit-loaded depending on the LED frequency response. More subcarriers are allocated for communication at low SNIR locations. Hence, nearly equal data rate can be provided everywhere. Demonstration of 17 Mb/s/LED data rate was provided.

主出版物標題Novel Optical Systems Design and Optimization XVII
編輯Arthur J. Davis, G. Groot Gregory
出版狀態Published - 1 一月 2014
事件17th Conference of Novel Optical Systems Design and Optimization - San Diego, United States
持續時間: 17 八月 201419 八月 2014


名字Proceedings of SPIE - The International Society for Optical Engineering


Conference17th Conference of Novel Optical Systems Design and Optimization
國家/地區United States
城市San Diego


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