Infrared and Laser Engineering, Volume. 47, Issue 9, 920004(2018)
White LED modulation bandwidth expansion based on indoor VLC
For the application requirements of the indoor lighting scenes, the effect on the frequency characteristics of four types common LEDs caused by the drive current fluctuations was researched, and the conclusion was that the frequency characteristic response of the phosphor LED was almost unaffected by the drive current variations. Combined with the hardware pre-equalization strategy, the theoretical analysis and the hardware circuit design to expand bandwidth of the 1 W phosphor LED were done. The experimental results prove that without the blue filter, the modulation bandwidth of the phosphor LED is increased from 1 MHz to 32 MHz, and 26 Mbit/s phosphor LED VLC covered 3 meters communiations distance using non-return-to-zero on-off-keying(NRZ-OOK)modulation is realized with bit error ratio of 7.55×10-6 , which meets the requirements of the transmission distance in indoor VLC system.
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Wei Youcai, Song Xiaoqing, Zhao Zixu, Wang Muyu. White LED modulation bandwidth expansion based on indoor VLC[J]. Infrared and Laser Engineering, 2018, 47(9): 920004
Category: 光电器件及应用
Received: Apr. 7, 2018
Accepted: May. 12, 2018
Published Online: Oct. 6, 2018
The Author Email: Youcai Wei (aafewyc@163.com)