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Chin. Opt. Lett.
 Home  List of Issues    Issue 08 , Vol. 15 , 2017    10.3788/COL201715.080601


Bandwidth-efficient visible light communication system based on faster-than-Nyquist pre-coded CAP modulation
Nan Chi, Jiaqi Zhao, and Zhixin Wang
State Key Lab of ASIC, Department of Communication Science and Engineering, [Fudan University], Shanghai 200433, China

Chin. Opt. Lett., 2017, 15(08): pp.080601

DOI:10.3788/COL201715.080601
Topic:Fiber optics and optical communication
Keywords(OCIS Code): 060.2605  060.4510  230.3670  

Abstract
With the rapid development of the light-emitting diode (LED) industry, interest in visible light communication (VLC) is growing. The limited bandwidth of commercial LEDs is one of the main challenges to achieve high-speed VLC. In this Letter, a kind of bandwidth-efficient VLC system based on carrierless amplitude and phase (CAP) modulation is proposed, where a simple differential faster-than-Nyquist (FTN) pre-coding scheme is employed to compress the spectrum and further improve the overall system baud rate. The system is experimentally demonstrated with a data rate of 1.47-Gb/s over 1.5 m free space transmission. The results indicate that an improvement of 80 Mbaud is achieved by FTN-CAP4 at 20% subband overlap and 40 Mbaud rate improvement by FTN-CAP16 at 7.5% subband overlap. Compared with traditional CAP, the FTN pre-coded CAP shows a better performance in spectral efficiency (SE) and intercarrier interference resistance. To the best of our knowledge, it is the first time to employ FTN pre-coded CAP in indoor high-data-rate VLC systems.

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Received:2017/2/20
Accepted:2017/4/14
Posted online:2017/5/15

Get Citation: Nan Chi, Jiaqi Zhao, and Zhixin Wang, "Bandwidth-efficient visible light communication system based on faster-than-Nyquist pre-coded CAP modulation," Chin. Opt. Lett. 15(08), 080601(2017)

Note: This work was supported by the National Science Foundation of China (No. 61571133) and the Key Project of Guangdong Province of China (No. 2015B010113001).



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