1.2 Gbit/s visible light transmission based on orthogonal frequency-division multiplexing using a phosphorescent white light-emitting diode and a pre-equalization circuit

The system of intellectual lighting data transmission via visible light is developed and manufactured. Spectral characteristics of a downlink which uses the red crystal of a RGBW light emitting diode for data transfer were studied. The DALI protocol-based radiation chromaticity control system which allows us to set different lighting scenarios with constant data transmission rate was developed. The radiation chromaticity range covers almost the entire colour gamut in the colour space. The system of high-frequency matching of system component impedances was developed and frequency characteristics of the suggested scheme were studied for development of the system. Optimal parameters of the signal for visual light communication such as carrier frequency, modulation type and band were determined. Observation of the constellation diagram which represents different values of the complex amplitude of the keyed signal in the form of a complex number on a quadrature plane (cosine and sine components of the carrying signal) and of fixation of the amplitude of the error vector magnitude (EVM) was selected as a method of study of the transmission channel quality. The value of EVM in the visible light transmission channel was significantly lower for signals with amplitude modulation than for phase-manipulated signals. When implementing different lighting change scenarios, radiation of other crystals of the light emitting diode crystals not used for transmission did not lead to increase of EVM by more than one percent.

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Hybrid space-frequency domain pre-equalization for DC-biased optical orthogonal frequency division multiplexing based imaging multiple-input multiple-output visible light communication systems

Optical Engineering ◽

10.1117/1.oe.56.3.036102 ◽

2017 ◽

Vol 56 (3) ◽

pp. 036102

Author(s):

Chen Chen ◽

Wen-De Zhong

Keyword(s):

Visible Light ◽

Communication Systems ◽

Orthogonal Frequency Division Multiplexing ◽

Multiple Input Multiple Output ◽

Visible Light Communication ◽

Frequency Division Multiplexing ◽

Frequency Division ◽

Multiple Input ◽

Input Multiple Output ◽

Space Frequency

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Faster-Than-Nyquist Non-Orthogonal Frequency-Division Multiplexing for Visible Light Communications

IEEE Access ◽

10.1109/access.2018.2820100 ◽

2018 ◽

Vol 6 ◽

pp. 17933-17941 ◽

Cited By ~ 3

Author(s):

Ji Zhou ◽

Qi Wang ◽

Jinlong Wei ◽

Qixiang Cheng ◽

Tiantian Zhang ◽

...

Keyword(s):

Visible Light ◽

Orthogonal Frequency Division Multiplexing ◽

Frequency Division Multiplexing ◽

Visible Light Communications ◽

Frequency Division

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Dynamic Hyperchaotic Key Generation Using Optical Orthogonal Frequency Division Multiplexing-based Visible Light Communication Networks

10.21203/rs.3.rs-499286/v1 ◽

2021 ◽

Author(s):

Mohammed Alresheedi ◽

YAHYA AL-MOLIKI ◽

Yahya Al-Harthi ◽

Ali Alqahtani

Keyword(s):

Visible Light ◽

Communication Networks ◽

Orthogonal Frequency Division Multiplexing ◽

Average Power ◽

Visible Light Communication ◽

Frequency Division Multiplexing ◽

Key Generation ◽

Frequency Division ◽

Degree Of Protection ◽

Communication Time

Abstract This paper introduces an optical orthogonal frequency division multiplexing (OFDM)-based hyperchaotic key generation encryption approach that can improve confidentiality in visible light communication (VLC) networks. Using a hyperchaotic four-dimensional method, the bipolar real-valued OFDM signal can be used for constructing dynamic cypher keys modified at every frame over the communication time, resulting in a superior degree of protection against statistical and correlation attacks. In accordance with our findings, this approach decreases the ratio of peak-to-average power of the transmitted signal, and enhances the bit error rate efficiency and secrecy capacity of the OFDM-based VLC network, which improves confidentiality.

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