Visible light communication system and method thereof

Abstract

The invention discloses a visible light communication system and a visible light communication method thereof, which relate to the technical field of wireless optical communication. The system comprises a transmitter and a receiver. An input signal is converted into an optical signal by the transmitter, the optical signal is transmitted to the receiver by a wireless optical channel, and the receiver converts the optical signal into an electrical signal and outputs the electrical signal. The transmitter comprises a carrier interferometry orthogonal frequency division multiplexing (CI-OFDM) modulation circuit and a white light-emitting diode (LED) drive circuit which are connected, wherein the CI-OFDM modulation circuit is used for performing CI-OFDM modulation on data input by a user; and the white LED drive circuit is used for converting the electrical signal generated by the CI-OFDM modulation circuit into the optical signal. The receiver comprises a PD photoelectric detector and a CI-OFDM demodulation circuit which are connected, wherein the PD photoelectric detector is used for performing P / D conversion on the received optical signal to convert the optical signal into the electrical signal; and the CI-OFDM demodulation circuit is used for performing CI-OFDM demodulation on the received data. By the system and the method, the transmission quality of the visible light communication system can be effectively improved, and the peak-to-average power ratio of an OFDM transmitted signal can be reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless optical communication, in particular to a visible light communication system and a method thereof. Background technique [0002] In order to meet the development needs of large-capacity ubiquitous wireless communication in the future, exploring and applying new spectrum and even spectral resources to realize ubiquitous broadband wireless communication has become a research hotspot and a focus of competition worldwide. Visible Light Communication (VLC) technology is a broadband wireless access technology. It transmits information through high-speed light and dark signals emitted by light-emitting diodes that cannot be detected by the naked eye, but can be captured and detected by photodetectors and other devices. It can transmit data while providing lighting, and can provide large-capacity communication services with extremely rich spectrum resources (ultra-wide spectrum frequency band is ...

AI Technical Summary

Problems solved by technology

However, the visible light OFDM system has its own defects: for example, there is no frequency diversity, so that the bit error rate performance is seriously affected by the zero point of the channel spectrum; the peak-to-average power ratio (PAPR) is too large, which leads to the nonlinear problem of the transmit power amplifier.

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