Visible light communication system based on polarization code and implementation method thereof

Abstract

The invention discloses a visible light communication system based on a polarization code and an implementation method thereof. The system comprises a transmitting subsystem used for transmitting a visible light signal and a receiving subsystem used for receiving the visible light signal, the transmitting subsystem performs polarization code error correction encoding and OOK modulation on an input signal, outputs continuous modulation waveforms, drives an LED light source to emit light and transmits the signal; the receiving subsystem converts the light signal received by a photoelectric detection element into light current in proportional incident energy, the light current is conditioned by a conditioning circuit into a signal suitable for a digital demodulator circuit, the signal is input to a digital demodulator, and the information is finally restored by means of the demodulation of the digital demodulator and polarization code error correction decoding; the visible light communication system disclosed by the invention is based on the polarization code encoding and decoding method, the encoding and decoding structure is simple, and the complexity is low; and in addition, the visible light communication system disclosed by the invention supports an adaptive dimming ratio, has a limited run length and satisfies the illuminating requirements of uniform illumination without flicking, and no additional encoding balance and circuit encoding technology needs to be increased.

Description

Technical field [0001] The present invention relates to the field of optical communication, in particular to a visible light communication system based on polarization codes and an implementation method thereof. Background technique [0002] Visible Light Communication (VLC) has the advantage that it can be used for both lighting and communication. With the wide application of LEDs in various fields such as lighting, communication and sensing technology, it is considered to be a technology with great development potential and application prospects. . Compared with the existing radio frequency communication technology, visible light communication has gradually become a hot spot technology for indoor / outdoor short-distance communication due to its advantages of green and high energy efficiency, immunity to electromagnetic interference, rich spectrum resources and high confidentiality. [0003] A typical visible light communication system includes a transmitting subsystem and a recei...

AI Technical Summary

Problems solved by technology

[0005] (1) LDPC code is a block error-correcting code with a sparse parity check matrix, its performance is close to the Shannon limit, but not up to the Shannon limit

[0006] (2) The iterative message propagation decoding algorithm of LDPC code is complex

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