Ms. Afang Ge Profile

Afang Ge

at Nanjing Univ of Posts and Telecommunications

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Proceedings Article | 14 February 2019 Paper

Time domain hybrid modulation scheme for visible light communication

Afang Ge, Jian Chen

Proceedings Volume 11048, 110480H (2019) https://doi.org/10.1117/12.2518330

KEYWORDS: Modulation, Signal to noise ratio, Visible radiation, Telecommunications, Light emitting diodes, Time division multiplexing, Channel projecting optics, Systems modeling, RF communications, Transmitters

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Time division multiplexing (TDM) is common in visible light communication system, which means a channel carries two or more services and different services have the same communication demand. If a channel carries two businesses that have different communication requirement, for example, the bit error ratio (BER) for one is 10^-3 and for the other is 10^-5 , what can be done to help solve the problem. This paper proposes a time-domain hybrid modulation scheme for visible light communication with different service requirements. By appropriately designing a time division multiplexing frame and time slot occupancy ratios of different modulation formats, a continuous adaptation between spectral efficiency and different tiers of BER requirements can be realized for an optical channel. Such a transmission approach is called time domain hybrid modulation (TDHM). Common on-off keying modulation (OOK) and pulse position modulation (PPM) are used in the time domain hybrid modulation scheme in this paper because its simplicity of OOK and high power efficiency of PPM, which can solve the problem of different communication requirements in VLC. In this paper, when the demand of BER for OOK is 10^-3 and for PPM is 10^-5 , SNR for OOK and PPM are 16dB and 12dB. But if Hybrid modulation is used, the system can satisfy the demand of BER=10^-3 when SNR is just 14dB.

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