Premium
P‐9.3: Triple Modulation Visible Light Communications with Pixelated Addressable LED Array
Author(s) -
Lu Tao,
Feng Wei,
Liu Yibo,
Wang Ruoning,
Yu Zhiyi,
Liu Zhaojun
Publication year - 2018
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.12809
Subject(s) - visible light communication , modulation (music) , pulse position modulation , pulse amplitude modulation , transmission (telecommunications) , transmitter , pulse width modulation , bandwidth (computing) , optics , computer science , light emitting diode , data transmission , electronic engineering , physics , telecommunications , electrical engineering , pulse (music) , engineering , computer hardware , acoustics , detector , channel (broadcasting) , voltage
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.