Triple Modulation Visible Light Communications with Pixelated Addressable LED Array
The transmission rate of visible light communication(VLC)system remains low due to the low bandwidth performance of light emitting diode(LED). Therefore, a VLC transmitter, which consists of an LED array integrated with triple modulation technique, is presented. With a 4-level pulse amplitude modulation(PAM)scheme, the transmission rate of the VLC system is enhanced by about two times. With a second-order pulse position modulation(PPM)scheme, the transmission rate of the VLC system is enhanced by about two times further. Therefore, four times enhanced transmission rate was got with both PAM and PPM scheme. In addition, it also can be directly compatible with a second-order pulse width modulation(PWM) dimming control schemes, which can not only control illumination levels to suit for indoor lighting and communication but increase the transmission rate to six times. Then, the constellation design of the triple modulation for equal-distribution in VLC is studied in this paper. Through simulating in MATLAB software, the results show that without increasing the bandwidth of the device, the data transmission rate of the VLC system in triple modulation are improved and our optimization scheme effectively increases the minimum distance between the constellation points.
Cited Times [WOS]:0
|Document Type||Conference paper|
|Department||Southern University of Science and Technology|
1.Southern University of Science and Technology,Shenzhen,China
2.Sun Yat-sen University,Carnegie Mellon University Shunde International Joint Research Institute,Shunde,China
Lu，Tao,Feng，Wei,Liu，Yibo,et al. Triple Modulation Visible Light Communications with Pixelated Addressable LED Array[C],2018:665-669.
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