Multilevel modulation scheme using the overlapping of two light sources for visible light communication with mobile phone camera

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Abstract
Visible light communication (VLC) with light emitting diodes (LEDs) is an emerging technology for 5G wireless communications. Recently, using complementary metal-oxide-semiconductor (CMOS) image sensor as VLC receiver is developed owing to its flexibility and low-cost. However, two illumination levels such as on-off keying (OOK) signal are used. To improve the system throughput and reduce complexity of the hardware design, in this paper, we propose and experimentally demonstrate a multilevel modulation scheme for VLC system utilizing the overlapping of two light sources for the first time, and the two light sources are modulated by an OOK and a Manchester signal respectively. At the receiver, a CMOS camera can demodulate the Manchester and the OOK signal simultaneously. Meanwhile, a low-pass filter (LPF) is used to enhance the system performance. The experimental results demonstrate that the proposed multilevel modulation scheme can achieve a net data rate of 4.32 kbit/s.
Funding Information
  • Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China
  • National Natural Science Foundation of China (NSFC) (61307087, 61377079, 61571188)
  • Science and technology project of Hunan Province (2016GK2011)

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